无法实例化以下类：-com.google.android.gms.plus.PlusOneButton
我将按照本教程在我的应用程序中集成+1按钮 当我把这段代码放到xml中时，GraphicallYout中就出现了错误无法实例化以下类：-com.google.android.gms.plus.PlusOneButton,android,android-layout,google-play-services,android-xml,google-plus-one,Android,Android Layout,Google Play Services,Android Xml,Google Plus One,我将按照本教程在我的应用程序中集成+1按钮 当我把这段代码放到xml中时，GraphicallYout中就出现了错误 <com.google.android.gms.plus.PlusOneButton xmlns:plus="http://schemas.android.com/apk/lib/com.google.android.gms.plus" android:id="@+id/plus_one_button" android:layout_width="wrap_content"
<com.google.android.gms.plus.PlusOneButton
xmlns:plus="http://schemas.android.com/apk/lib/com.google.android.gms.plus"
android:id="@+id/plus_one_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
plus:size="standard"
plus:annotation="inline" />
救命 Android Studio解决方案： 我刚刚得到一个简单的示例，从中的代码开始，然后使用问题中链接的指南添加+1按钮 build.gradle依赖项：
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.1.1'
compile 'com.google.android.gms:play-services:7.0.0'
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.plustest.daniel.googleplusone" >
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</manifest>
URLpublic class MainActivity extends FragmentActivity implements
ConnectionCallbacks, OnConnectionFailedListener,
ResultCallback<LoadPeopleResult>, View.OnClickListener,
CheckBox.OnCheckedChangeListener, GoogleApiClient.ServerAuthCodeCallbacks {
private static final String TAG = "android-plus-quickstart";
private static final int STATE_DEFAULT = 0;
private static final int STATE_SIGN_IN = 1;
private static final int STATE_IN_PROGRESS = 2;
private static final int RC_SIGN_IN = 0;
private static final String SAVED_PROGRESS = "sign_in_progress";
// Client ID for a web server that will receive the auth code and exchange it for a
// refresh token if offline access is requested.
private static final String WEB_CLIENT_ID = "WEB_CLIENT_ID";
// Base URL for your token exchange server, no trailing slash.
private static final String SERVER_BASE_URL = "SERVER_BASE_URL";
// URL where the client should GET the scopes that the server would like granted
// before asking for a serverAuthCode
private static final String EXCHANGE_TOKEN_URL = SERVER_BASE_URL + "/exchangetoken";
// URL where the client should POST the serverAuthCode so that the server can exchange
// it for a refresh token,
private static final String SELECT_SCOPES_URL = SERVER_BASE_URL + "/selectscopes";
private int mSignInProgress;
// Used to store the PendingIntent most recently returned by Google Play
// services until the user clicks 'sign in'.
private PendingIntent mSignInIntent;
// Used to store the error code most recently returned by Google Play services
// until the user clicks 'sign in'.
private int mSignInError;
// Used to determine if we should ask for a server auth code when connecting the
// GoogleApiClient. False by default so that this sample can be used without configuring
// a WEB_CLIENT_ID and SERVER_BASE_URL.
private boolean mRequestServerAuthCode = false;
// Used to mock the state of a server that would receive an auth code to exchange
// for a refresh token, If true, the client will assume that the server has the
// permissions it wants and will not send an auth code on sign in. If false,
// the client will request offline access on sign in and send and new auth code
// to the server. True by default because this sample does not implement a server
// so there would be nowhere to send the code.
private boolean mServerHasToken = true;
private SignInButton mSignInButton;
private Button mSignOutButton;
private Button mRevokeButton;
private TextView mStatus;
private ListView mCirclesListView;
private ArrayAdapter<String> mCirclesAdapter;
private ArrayList<String> mCirclesList;
//added:
private PlusOneButton mPlusOneButton;
private String URL = "https://plus.google.com/101009371381835899795/posts";
private static final int PLUS_ONE_REQUEST_CODE = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSignInButton = (SignInButton) findViewById(R.id.sign_in_button);
mSignOutButton = (Button) findViewById(R.id.sign_out_button);
mRevokeButton = (Button) findViewById(R.id.revoke_access_button);
mStatus = (TextView) findViewById(R.id.sign_in_status);
mCirclesListView = (ListView) findViewById(R.id.circles_list);
//added:
mPlusOneButton = (PlusOneButton) findViewById(R.id.plus_one_button);
// Button listeners
mSignInButton.setOnClickListener(this);
mSignOutButton.setOnClickListener(this);
mRevokeButton.setOnClickListener(this);
// CheckBox listeners
((CheckBox) findViewById(R.id.request_auth_code_checkbox)).setOnCheckedChangeListener(this);
((CheckBox) findViewById(R.id.has_token_checkbox)).setOnCheckedChangeListener(this);
mCirclesList = new ArrayList<String>();
mCirclesAdapter = new ArrayAdapter<String>(
this, R.layout.circle_member, mCirclesList);
mCirclesListView.setAdapter(mCirclesAdapter);
if (savedInstanceState != null) {
mSignInProgress = savedInstanceState
.getInt(SAVED_PROGRESS, STATE_DEFAULT);
}
mGoogleApiClient = buildGoogleApiClient();
}
private GoogleApiClient buildGoogleApiClient() {
// When we build the GoogleApiClient we specify where connected and
// connection failed callbacks should be returned, which Google APIs our
// app uses and which OAuth 2.0 scopes our app requests.
GoogleApiClient.Builder builder = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(Plus.API, Plus.PlusOptions.builder().build())
.addScope(Plus.SCOPE_PLUS_LOGIN);
if (mRequestServerAuthCode) {
checkServerAuthConfiguration();
builder = builder.requestServerAuthCode(WEB_CLIENT_ID, this);
}
return builder.build();
}
//added:
@Override
protected void onResume() {
super.onResume();
// Refresh the state of the +1 button each time the activity receives focus.
mPlusOneButton.initialize(URL, PLUS_ONE_REQUEST_CODE);
}
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
protected void onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(SAVED_PROGRESS, mSignInProgress);
}
@Override
public void onClick(View v) {
if (!mGoogleApiClient.isConnecting()) {
// We only process button clicks when GoogleApiClient is not transitioning
// between connected and not connected.
switch (v.getId()) {
case R.id.sign_in_button:
mStatus.setText(R.string.status_signing_in);
mSignInProgress = STATE_SIGN_IN;
mGoogleApiClient.connect();
break;
case R.id.sign_out_button:
// We clear the default account on sign out so that Google Play
// services will not return an onConnected callback without user
// interaction.
if (mGoogleApiClient.isConnected()) {
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
mGoogleApiClient.disconnect();
}
onSignedOut();
break;
case R.id.revoke_access_button:
// After we revoke permissions for the user with a GoogleApiClient
// instance, we must discard it and create a new one.
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
// Our sample has caches no user data from Google+, however we
// would normally register a callback on revokeAccessAndDisconnect
// to delete user data so that we comply with Google developer
// policies.
Plus.AccountApi.revokeAccessAndDisconnect(mGoogleApiClient);
mGoogleApiClient = buildGoogleApiClient();
mGoogleApiClient.connect();
break;
}
}
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
switch (buttonView.getId()) {
case R.id.request_auth_code_checkbox:
mRequestServerAuthCode = isChecked;
buildGoogleApiClient();
if (isChecked) {
findViewById(R.id.layout_has_token).setVisibility(View.VISIBLE);
} else {
findViewById(R.id.layout_has_token).setVisibility(View.INVISIBLE);
}
break;
case R.id.has_token_checkbox:
mServerHasToken = isChecked;
break;
}
}
/* onConnected is called when our Activity successfully connects to Google
* Play services. onConnected indicates that an account was selected on the
* device, that the selected account has granted any requested permissions to
* our app and that we were able to establish a service connection to Google
* Play services.
*/
@Override
public void onConnected(Bundle connectionHint) {
// Reaching onConnected means we consider the user signed in.
Log.i(TAG, "onConnected");
// Update the user interface to reflect that the user is signed in.
mSignInButton.setEnabled(false);
mSignOutButton.setEnabled(true);
mRevokeButton.setEnabled(true);
// Hide the sign-in options, they no longer apply
findViewById(R.id.layout_server_auth).setVisibility(View.GONE);
// Retrieve some profile information to personalize our app for the user.
Person currentUser = Plus.PeopleApi.getCurrentPerson(mGoogleApiClient);
mStatus.setText(String.format(
getResources().getString(R.string.signed_in_as),
currentUser.getDisplayName()));
Plus.PeopleApi.loadVisible(mGoogleApiClient, null)
.setResultCallback(this);
// Indicate that the sign in process is complete.
mSignInProgress = STATE_DEFAULT;
}
/* onConnectionFailed is called when our Activity could not connect to Google
* Play services. onConnectionFailed indicates that the user needs to select
* an account, grant permissions or resolve an error in order to sign in.
*/
@Override
public void onConnectionFailed(ConnectionResult result) {
// Refer to the javadoc for ConnectionResult to see what error codes might
// be returned in onConnectionFailed.
Log.i(TAG, "onConnectionFailed: ConnectionResult.getErrorCode() = "
+ result.getErrorCode());
if (result.getErrorCode() == ConnectionResult.API_UNAVAILABLE) {
// An API requested for GoogleApiClient is not available. The device's current
// configuration might not be supported with the requested API or a required component
// may not be installed, such as the Android Wear application. You may need to use a
// second GoogleApiClient to manage the application's optional APIs.
Log.w(TAG, "API Unavailable.");
} else if (mSignInProgress != STATE_IN_PROGRESS) {
// We do not have an intent in progress so we should store the latest
// error resolution intent for use when the sign in button is clicked.
mSignInIntent = result.getResolution();
mSignInError = result.getErrorCode();
if (mSignInProgress == STATE_SIGN_IN) {
// STATE_SIGN_IN indicates the user already clicked the sign in button
// so we should continue processing errors until the user is signed in
// or they click cancel.
resolveSignInError();
}
}
// In this sample we consider the user signed out whenever they do not have
// a connection to Google Play services.
onSignedOut();
}
private void resolveSignInError() {
if (mSignInIntent != null) {
// We have an intent which will allow our user to sign in or
// resolve an error. For example if the user needs to
// select an account to sign in with, or if they need to consent
// to the permissions your app is requesting.
try {
// Send the pending intent that we stored on the most recent
// OnConnectionFailed callback. This will allow the user to
// resolve the error currently preventing our connection to
// Google Play services.
mSignInProgress = STATE_IN_PROGRESS;
startIntentSenderForResult(mSignInIntent.getIntentSender(),
RC_SIGN_IN, null, 0, 0, 0);
} catch (SendIntentException e) {
Log.i(TAG, "Sign in intent could not be sent: "
+ e.getLocalizedMessage());
// The intent was canceled before it was sent. Attempt to connect to
// get an updated ConnectionResult.
mSignInProgress = STATE_SIGN_IN;
mGoogleApiClient.connect();
}
} else {
// Google Play services wasn't able to provide an intent for some
// error types, so we show the default Google Play services error
// dialog which may still start an intent on our behalf if the
// user can resolve the issue.
createErrorDialog().show();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
switch (requestCode) {
case RC_SIGN_IN:
if (resultCode == RESULT_OK) {
// If the error resolution was successful we should continue
// processing errors.
mSignInProgress = STATE_SIGN_IN;
} else {
// If the error resolution was not successful or the user canceled,
// we should stop processing errors.
mSignInProgress = STATE_DEFAULT;
}
if (!mGoogleApiClient.isConnecting()) {
// If Google Play services resolved the issue with a dialog then
// onStart is not called so we need to re-attempt connection here.
mGoogleApiClient.connect();
}
break;
}
}
@Override
public void onResult(LoadPeopleResult peopleData) {
if (peopleData.getStatus().getStatusCode() == CommonStatusCodes.SUCCESS) {
mCirclesList.clear();
PersonBuffer personBuffer = peopleData.getPersonBuffer();
try {
int count = personBuffer.getCount();
for (int i = 0; i < count; i++) {
mCirclesList.add(personBuffer.get(i).getDisplayName());
}
} finally {
personBuffer.close();
}
mCirclesAdapter.notifyDataSetChanged();
} else {
Log.e(TAG, "Error requesting visible circles: " + peopleData.getStatus());
}
}
private void onSignedOut() {
// Update the UI to reflect that the user is signed out.
mSignInButton.setEnabled(true);
mSignOutButton.setEnabled(false);
mRevokeButton.setEnabled(false);
// Show the sign-in options
findViewById(R.id.layout_server_auth).setVisibility(View.VISIBLE);
mStatus.setText(R.string.status_signed_out);
mCirclesList.clear();
mCirclesAdapter.notifyDataSetChanged();
}
@Override
public void onConnectionSuspended(int cause) {
// The connection to Google Play services was lost for some reason.
// We call connect() to attempt to re-establish the connection or get a
// ConnectionResult that we can attempt to resolve.
mGoogleApiClient.connect();
}
private Dialog createErrorDialog() {
if (GooglePlayServicesUtil.isUserRecoverableError(mSignInError)) {
return GooglePlayServicesUtil.getErrorDialog(
mSignInError,
this,
RC_SIGN_IN,
new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
Log.e(TAG, "Google Play services resolution cancelled");
mSignInProgress = STATE_DEFAULT;
mStatus.setText(R.string.status_signed_out);
}
});
} else {
return new AlertDialog.Builder(this)
.setMessage(R.string.play_services_error)
.setPositiveButton(R.string.close,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.e(TAG, "Google Play services error could not be "
+ "resolved: " + mSignInError);
mSignInProgress = STATE_DEFAULT;
mStatus.setText(R.string.status_signed_out);
}
}).create();
}
}
@Override
public CheckResult onCheckServerAuthorization(String idToken, Set<Scope> scopeSet) {
Log.i(TAG, "Checking if server is authorized.");
Log.i(TAG, "Mocking server has refresh token: " + String.valueOf(mServerHasToken));
if (!mServerHasToken) {
// Server does not have a valid refresh token, so request a new
// auth code which can be exchanged for one. This will cause the user to see the
// consent dialog and be prompted to grant offline access. This callback occurs on a
// background thread so it is OK to do synchronous network access.
// Ask the server which scopes it would like to have for offline access. This
// can be distinct from the scopes granted to the client. By getting these values
// from the server, you can change your server's permissions without needing to
// recompile the client application.
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(SELECT_SCOPES_URL);
HashSet<Scope> serverScopeSet = new HashSet<Scope>();
try {
HttpResponse httpResponse = httpClient.execute(httpGet);
int responseCode = httpResponse.getStatusLine().getStatusCode();
String responseBody = EntityUtils.toString(httpResponse.getEntity());
if (responseCode == 200) {
String[] scopeStrings = responseBody.split(" ");
for (String scope : scopeStrings) {
Log.i(TAG, "Server Scope: " + scope);
serverScopeSet.add(new Scope(scope));
}
} else {
Log.e(TAG, "Error in getting server scopes: " + responseCode);
}
} catch (ClientProtocolException e) {
Log.e(TAG, "Error in getting server scopes.", e);
} catch (IOException e) {
Log.e(TAG, "Error in getting server scopes.", e);
}
// This tells GoogleApiClient that the server needs a new serverAuthCode with
// access to the scopes in serverScopeSet. Note that we are not asking the server
// if it already has such a token because this is a sample application. In reality,
// you should only do this on the first user sign-in or if the server loses or deletes
// the refresh token.
return CheckResult.newAuthRequiredResult(serverScopeSet);
} else {
// Server already has a valid refresh token with the correct scopes, no need to
// ask the user for offline access again.
return CheckResult.newAuthNotRequiredResult();
}
}
@Override
public boolean onUploadServerAuthCode(String idToken, String serverAuthCode) {
// Upload the serverAuthCode to the server, which will attempt to exchange it for
// a refresh token. This callback occurs on a background thread, so it is OK
// to perform synchronous network access. Returning 'false' will fail the
// GoogleApiClient.connect() call so if you would like the client to ignore
// server failures, always return true.
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(EXCHANGE_TOKEN_URL);
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("serverAuthCode", serverAuthCode));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpClient.execute(httpPost);
int statusCode = response.getStatusLine().getStatusCode();
final String responseBody = EntityUtils.toString(response.getEntity());
Log.i(TAG, "Code: " + statusCode);
Log.i(TAG, "Resp: " + responseBody);
// Show Toast on UI Thread
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, responseBody, Toast.LENGTH_LONG).show();
}
});
return (statusCode == 200);
} catch (ClientProtocolException e) {
Log.e(TAG, "Error in auth code exchange.", e);
return false;
} catch (IOException e) {
Log.e(TAG, "Error in auth code exchange.", e);
return false;
}
}
private void checkServerAuthConfiguration() {
// Check that the server URL is configured before allowing this box to
// be unchecked
if ("WEB_CLIENT_ID".equals(WEB_CLIENT_ID) ||
"SERVER_BASE_URL".equals(SERVER_BASE_URL)) {
Log.w(TAG, "WEB_CLIENT_ID or SERVER_BASE_URL configured incorrectly.");
Dialog dialog = new AlertDialog.Builder(this)
.setMessage(getString(R.string.configuration_error))
.setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.create();
dialog.show();
}
}
}
public类MainActivity扩展了FragmentActivity实现
ConnectionCallbacks、OnConnectionFailedListener、，
ResultCallback，View.OnClickListener，
CheckBox.OnCheckedChangeListener，GoogleAppClient.ServerAuthCodeCallbacks{
私有静态最终字符串TAG=“android plus quickstart”；
私有静态最终整数状态_默认值=0；
私有静态最终整数状态\u符号\u IN=1；
私有静态最终int状态_IN_PROGRESS=2；
私有静态最终int RC_SIGN_IN=0；
保存的私有静态最终字符串\u PROGRESS=“在\u PROGRESS中签名”；
//web服务器的客户端ID，该服务器将接收身份验证代码并将其交换为身份验证
//如果请求脱机访问，请刷新令牌。
私有静态最终字符串WEB\u CLIENT\u ID=“WEB\u CLIENT\u ID”；
//令牌交换服务器的基本URL，无尾随斜杠。
私有静态最终字符串SERVER\u BASE\u URL=“SERVER\u BASE\u URL”；
//客户端应在其中获取服务器希望授予的作用域的URL
//在请求服务器身份验证代码之前
私有静态最终字符串交换\令牌\ URL=服务器\基础\ URL+“/exchangetoken”；
//客户端应在其中发布serverAuthCode以便服务器可以交换的URL
//这是一个刷新令牌，
私有静态最终字符串SELECT\u SCOPES\u URL=SERVER\u BASE\u URL+“/selectscopes”；
私人内部mSignInProgress；
//用于存储Google Play最近返回的Pending帐篷
//服务，直到用户单击“登录”。
私人悬垂物；
//用于存储Google Play services最近返回的错误代码
//直到用户单击“登录”。
私有int-msignin错误；
//用于确定在连接服务器时是否应请求服务器身份验证代码
//默认情况下为False，因此无需配置即可使用此示例
//WEB客户端ID和服务器基URL。
私有布尔值mRequestServerAuthCode=false；
//用于模拟将接收要交换的身份验证代码的服务器的状态
//对于刷新令牌，如果为true，客户端将假定服务器具有
//它需要并且不会在登录时发送身份验证代码的权限。如果为false，
//客户端将在登录并发送新的身份验证代码时请求脱机访问
//默认情况下为True，因为此示例未实现服务器
//这样就没有地方发送代码了。
私有布尔值mServerHasToken=true；
私人登录按钮mSignInButton；
专用按钮mSignOutButton；
私人按钮mRevokeButton；
私有文本视图mStatus；
私有ListView mCirclesListView；
专用阵列适配器mCirclesAdapter；
私有数组列表mCirclesList；
//增加：
私有plusOn按钮mplusOne按钮；
专用字符串URL=”https://plus.google.com/101009371381835899795/posts";
私有静态最终整数加上一个请求代码=0；
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
mSignInButton=（SignInButton）findViewById（R.id.sign_in_按钮）；
mSignOutButton=（按钮）findViewById（R.id.sign\u out\u按钮）；
mRevokeButton=（按钮）findViewById（R.id.revoke\u access\u按钮）；
mStatus=（TextView）findViewById（R.id.sign\u处于\u状态）；
mCirclesListView=（ListView）findViewById（R.id.circles\u列表）；
//增加：
mPlusOneButton=（PlusOneButton）findviewbyd（R.id.plus_one_按钮）；
//按钮侦听器
mSignInButton.setOnClickListener（这个）；
mSignOutButton.setOnClickListener（此）；
mrevokButton.setOnClickListener（此）；
//复选框侦听器
（（复选框）findViewById（R.id.request\u auth\u code\u复选框））.setOnCheckedChangeListener（this）；
（（复选框）findViewById（R.id.has_token_CheckBox））.setOnCheckedChangeListener（this）；
mCirclesList=newarraylist（）；
mCirclesAdapter=新阵列适配器(
此，R.layout.circle_成员，mCirclesList）；
setAdapter（mCirclesAdapter）；
如果（savedInstanceState！=null）{
mSignInProgress=savedInstanceState
.getInt（已保存的进度，状态为默认值）；
}
mgoogleapclient=buildGoogleapclient（）；
}
私人GoogleapClient Building GoogleapClient（）的{
//当我们构建GoogleAppClient时，我们指定连接的位置和
//应该返回连接失败的回调，这是Google API提供的
//应用程序使用哪些OAuth 2.0来定义我们的应用程序请求。
GoogleAppClient.Builder=新的GoogleAppClient.Builder（此）
.addConnectionCallbacks（此）
.addOnConnectionFailedListener（此）
.addApi（Plus.API，Plus.PlusOptions.builder（）.build（））
.addScope（Plus.SCOPE\u Plus\u登录）；
if（mRequestServerAuthCode）{
checkServerAuthConfiguration（）；
builder=builder.requestServerAuthCode（WEB\u客户端\u ID，this）；
}
返回builder.build（）；
}
//增加：
@凌驾
受保护的void onResume（）{
super.onResume（）；
//每次活动收到焦点时刷新+1按钮的状态。
mPlusOneButton.i
xmlns:plus="http://schemas.android.com/apk/lib/com.google.android.gms.plus"
android:id="@+id/plus_one_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
plus:size="standard"
plus:annotation="inline" />
public class MainActivity extends FragmentActivity implements
ConnectionCallbacks, OnConnectionFailedListener,
ResultCallback<LoadPeopleResult>, View.OnClickListener,
CheckBox.OnCheckedChangeListener, GoogleApiClient.ServerAuthCodeCallbacks {
private static final String TAG = "android-plus-quickstart";
private static final int STATE_DEFAULT = 0;
private static final int STATE_SIGN_IN = 1;
private static final int STATE_IN_PROGRESS = 2;
private static final int RC_SIGN_IN = 0;
private static final String SAVED_PROGRESS = "sign_in_progress";
// Client ID for a web server that will receive the auth code and exchange it for a
// refresh token if offline access is requested.
private static final String WEB_CLIENT_ID = "WEB_CLIENT_ID";
// Base URL for your token exchange server, no trailing slash.
private static final String SERVER_BASE_URL = "SERVER_BASE_URL";
// URL where the client should GET the scopes that the server would like granted
// before asking for a serverAuthCode
private static final String EXCHANGE_TOKEN_URL = SERVER_BASE_URL + "/exchangetoken";
// URL where the client should POST the serverAuthCode so that the server can exchange
// it for a refresh token,
private static final String SELECT_SCOPES_URL = SERVER_BASE_URL + "/selectscopes";
private int mSignInProgress;
// Used to store the PendingIntent most recently returned by Google Play
// services until the user clicks 'sign in'.
private PendingIntent mSignInIntent;
// Used to store the error code most recently returned by Google Play services
// until the user clicks 'sign in'.
private int mSignInError;
// Used to determine if we should ask for a server auth code when connecting the
// GoogleApiClient. False by default so that this sample can be used without configuring
// a WEB_CLIENT_ID and SERVER_BASE_URL.
private boolean mRequestServerAuthCode = false;
// Used to mock the state of a server that would receive an auth code to exchange
// for a refresh token, If true, the client will assume that the server has the
// permissions it wants and will not send an auth code on sign in. If false,
// the client will request offline access on sign in and send and new auth code
// to the server. True by default because this sample does not implement a server
// so there would be nowhere to send the code.
private boolean mServerHasToken = true;
private SignInButton mSignInButton;
private Button mSignOutButton;
private Button mRevokeButton;
private TextView mStatus;
private ListView mCirclesListView;
private ArrayAdapter<String> mCirclesAdapter;
private ArrayList<String> mCirclesList;
//added:
private PlusOneButton mPlusOneButton;
private String URL = "https://plus.google.com/101009371381835899795/posts";
private static final int PLUS_ONE_REQUEST_CODE = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSignInButton = (SignInButton) findViewById(R.id.sign_in_button);
mSignOutButton = (Button) findViewById(R.id.sign_out_button);
mRevokeButton = (Button) findViewById(R.id.revoke_access_button);
mStatus = (TextView) findViewById(R.id.sign_in_status);
mCirclesListView = (ListView) findViewById(R.id.circles_list);
//added:
mPlusOneButton = (PlusOneButton) findViewById(R.id.plus_one_button);
// Button listeners
mSignInButton.setOnClickListener(this);
mSignOutButton.setOnClickListener(this);
mRevokeButton.setOnClickListener(this);
// CheckBox listeners
((CheckBox) findViewById(R.id.request_auth_code_checkbox)).setOnCheckedChangeListener(this);
((CheckBox) findViewById(R.id.has_token_checkbox)).setOnCheckedChangeListener(this);
mCirclesList = new ArrayList<String>();
mCirclesAdapter = new ArrayAdapter<String>(
this, R.layout.circle_member, mCirclesList);
mCirclesListView.setAdapter(mCirclesAdapter);
if (savedInstanceState != null) {
mSignInProgress = savedInstanceState
.getInt(SAVED_PROGRESS, STATE_DEFAULT);
}
mGoogleApiClient = buildGoogleApiClient();
}
private GoogleApiClient buildGoogleApiClient() {
// When we build the GoogleApiClient we specify where connected and
// connection failed callbacks should be returned, which Google APIs our
// app uses and which OAuth 2.0 scopes our app requests.
GoogleApiClient.Builder builder = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(Plus.API, Plus.PlusOptions.builder().build())
.addScope(Plus.SCOPE_PLUS_LOGIN);
if (mRequestServerAuthCode) {
checkServerAuthConfiguration();
builder = builder.requestServerAuthCode(WEB_CLIENT_ID, this);
}
return builder.build();
}
//added:
@Override
protected void onResume() {
super.onResume();
// Refresh the state of the +1 button each time the activity receives focus.
mPlusOneButton.initialize(URL, PLUS_ONE_REQUEST_CODE);
}
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
protected void onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(SAVED_PROGRESS, mSignInProgress);
}
@Override
public void onClick(View v) {
if (!mGoogleApiClient.isConnecting()) {
// We only process button clicks when GoogleApiClient is not transitioning
// between connected and not connected.
switch (v.getId()) {
case R.id.sign_in_button:
mStatus.setText(R.string.status_signing_in);
mSignInProgress = STATE_SIGN_IN;
mGoogleApiClient.connect();
break;
case R.id.sign_out_button:
// We clear the default account on sign out so that Google Play
// services will not return an onConnected callback without user
// interaction.
if (mGoogleApiClient.isConnected()) {
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
mGoogleApiClient.disconnect();
}
onSignedOut();
break;
case R.id.revoke_access_button:
// After we revoke permissions for the user with a GoogleApiClient
// instance, we must discard it and create a new one.
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
// Our sample has caches no user data from Google+, however we
// would normally register a callback on revokeAccessAndDisconnect
// to delete user data so that we comply with Google developer
// policies.
Plus.AccountApi.revokeAccessAndDisconnect(mGoogleApiClient);
mGoogleApiClient = buildGoogleApiClient();
mGoogleApiClient.connect();
break;
}
}
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
switch (buttonView.getId()) {
case R.id.request_auth_code_checkbox:
mRequestServerAuthCode = isChecked;
buildGoogleApiClient();
if (isChecked) {
findViewById(R.id.layout_has_token).setVisibility(View.VISIBLE);
} else {
findViewById(R.id.layout_has_token).setVisibility(View.INVISIBLE);
}
break;
case R.id.has_token_checkbox:
mServerHasToken = isChecked;
break;
}
}
/* onConnected is called when our Activity successfully connects to Google
* Play services. onConnected indicates that an account was selected on the
* device, that the selected account has granted any requested permissions to
* our app and that we were able to establish a service connection to Google
* Play services.
*/
@Override
public void onConnected(Bundle connectionHint) {
// Reaching onConnected means we consider the user signed in.
Log.i(TAG, "onConnected");
// Update the user interface to reflect that the user is signed in.
mSignInButton.setEnabled(false);
mSignOutButton.setEnabled(true);
mRevokeButton.setEnabled(true);
// Hide the sign-in options, they no longer apply
findViewById(R.id.layout_server_auth).setVisibility(View.GONE);
// Retrieve some profile information to personalize our app for the user.
Person currentUser = Plus.PeopleApi.getCurrentPerson(mGoogleApiClient);
mStatus.setText(String.format(
getResources().getString(R.string.signed_in_as),
currentUser.getDisplayName()));
Plus.PeopleApi.loadVisible(mGoogleApiClient, null)
.setResultCallback(this);
// Indicate that the sign in process is complete.
mSignInProgress = STATE_DEFAULT;
}
/* onConnectionFailed is called when our Activity could not connect to Google
* Play services. onConnectionFailed indicates that the user needs to select
* an account, grant permissions or resolve an error in order to sign in.
*/
@Override
public void onConnectionFailed(ConnectionResult result) {
// Refer to the javadoc for ConnectionResult to see what error codes might
// be returned in onConnectionFailed.
Log.i(TAG, "onConnectionFailed: ConnectionResult.getErrorCode() = "
+ result.getErrorCode());
if (result.getErrorCode() == ConnectionResult.API_UNAVAILABLE) {
// An API requested for GoogleApiClient is not available. The device's current
// configuration might not be supported with the requested API or a required component
// may not be installed, such as the Android Wear application. You may need to use a
// second GoogleApiClient to manage the application's optional APIs.
Log.w(TAG, "API Unavailable.");
} else if (mSignInProgress != STATE_IN_PROGRESS) {
// We do not have an intent in progress so we should store the latest
// error resolution intent for use when the sign in button is clicked.
mSignInIntent = result.getResolution();
mSignInError = result.getErrorCode();
if (mSignInProgress == STATE_SIGN_IN) {
// STATE_SIGN_IN indicates the user already clicked the sign in button
// so we should continue processing errors until the user is signed in
// or they click cancel.
resolveSignInError();
}
}
// In this sample we consider the user signed out whenever they do not have
// a connection to Google Play services.
onSignedOut();
}
private void resolveSignInError() {
if (mSignInIntent != null) {
// We have an intent which will allow our user to sign in or
// resolve an error. For example if the user needs to
// select an account to sign in with, or if they need to consent
// to the permissions your app is requesting.
try {
// Send the pending intent that we stored on the most recent
// OnConnectionFailed callback. This will allow the user to
// resolve the error currently preventing our connection to
// Google Play services.
mSignInProgress = STATE_IN_PROGRESS;
startIntentSenderForResult(mSignInIntent.getIntentSender(),
RC_SIGN_IN, null, 0, 0, 0);
} catch (SendIntentException e) {
Log.i(TAG, "Sign in intent could not be sent: "
+ e.getLocalizedMessage());
// The intent was canceled before it was sent. Attempt to connect to
// get an updated ConnectionResult.
mSignInProgress = STATE_SIGN_IN;
mGoogleApiClient.connect();
}
} else {
// Google Play services wasn't able to provide an intent for some
// error types, so we show the default Google Play services error
// dialog which may still start an intent on our behalf if the
// user can resolve the issue.
createErrorDialog().show();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
switch (requestCode) {
case RC_SIGN_IN:
if (resultCode == RESULT_OK) {
// If the error resolution was successful we should continue
// processing errors.
mSignInProgress = STATE_SIGN_IN;
} else {
// If the error resolution was not successful or the user canceled,
// we should stop processing errors.
mSignInProgress = STATE_DEFAULT;
}
if (!mGoogleApiClient.isConnecting()) {
// If Google Play services resolved the issue with a dialog then
// onStart is not called so we need to re-attempt connection here.
mGoogleApiClient.connect();
}
break;
}
}
@Override
public void onResult(LoadPeopleResult peopleData) {
if (peopleData.getStatus().getStatusCode() == CommonStatusCodes.SUCCESS) {
mCirclesList.clear();
PersonBuffer personBuffer = peopleData.getPersonBuffer();
try {
int count = personBuffer.getCount();
for (int i = 0; i < count; i++) {
mCirclesList.add(personBuffer.get(i).getDisplayName());
}
} finally {
personBuffer.close();
}
mCirclesAdapter.notifyDataSetChanged();
} else {
Log.e(TAG, "Error requesting visible circles: " + peopleData.getStatus());
}
}
private void onSignedOut() {
// Update the UI to reflect that the user is signed out.
mSignInButton.setEnabled(true);
mSignOutButton.setEnabled(false);
mRevokeButton.setEnabled(false);
// Show the sign-in options
findViewById(R.id.layout_server_auth).setVisibility(View.VISIBLE);
mStatus.setText(R.string.status_signed_out);
mCirclesList.clear();
mCirclesAdapter.notifyDataSetChanged();
}
@Override
public void onConnectionSuspended(int cause) {
// The connection to Google Play services was lost for some reason.
// We call connect() to attempt to re-establish the connection or get a
// ConnectionResult that we can attempt to resolve.
mGoogleApiClient.connect();
}
private Dialog createErrorDialog() {
if (GooglePlayServicesUtil.isUserRecoverableError(mSignInError)) {
return GooglePlayServicesUtil.getErrorDialog(
mSignInError,
this,
RC_SIGN_IN,
new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
Log.e(TAG, "Google Play services resolution cancelled");
mSignInProgress = STATE_DEFAULT;
mStatus.setText(R.string.status_signed_out);
}
});
} else {
return new AlertDialog.Builder(this)
.setMessage(R.string.play_services_error)
.setPositiveButton(R.string.close,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.e(TAG, "Google Play services error could not be "
+ "resolved: " + mSignInError);
mSignInProgress = STATE_DEFAULT;
mStatus.setText(R.string.status_signed_out);
}
}).create();
}
}
@Override
public CheckResult onCheckServerAuthorization(String idToken, Set<Scope> scopeSet) {
Log.i(TAG, "Checking if server is authorized.");
Log.i(TAG, "Mocking server has refresh token: " + String.valueOf(mServerHasToken));
if (!mServerHasToken) {
// Server does not have a valid refresh token, so request a new
// auth code which can be exchanged for one. This will cause the user to see the
// consent dialog and be prompted to grant offline access. This callback occurs on a
// background thread so it is OK to do synchronous network access.
// Ask the server which scopes it would like to have for offline access. This
// can be distinct from the scopes granted to the client. By getting these values
// from the server, you can change your server's permissions without needing to
// recompile the client application.
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(SELECT_SCOPES_URL);
HashSet<Scope> serverScopeSet = new HashSet<Scope>();
try {
HttpResponse httpResponse = httpClient.execute(httpGet);
int responseCode = httpResponse.getStatusLine().getStatusCode();
String responseBody = EntityUtils.toString(httpResponse.getEntity());
if (responseCode == 200) {
String[] scopeStrings = responseBody.split(" ");
for (String scope : scopeStrings) {
Log.i(TAG, "Server Scope: " + scope);
serverScopeSet.add(new Scope(scope));
}
} else {
Log.e(TAG, "Error in getting server scopes: " + responseCode);
}
} catch (ClientProtocolException e) {
Log.e(TAG, "Error in getting server scopes.", e);
} catch (IOException e) {
Log.e(TAG, "Error in getting server scopes.", e);
}
// This tells GoogleApiClient that the server needs a new serverAuthCode with
// access to the scopes in serverScopeSet. Note that we are not asking the server
// if it already has such a token because this is a sample application. In reality,
// you should only do this on the first user sign-in or if the server loses or deletes
// the refresh token.
return CheckResult.newAuthRequiredResult(serverScopeSet);
} else {
// Server already has a valid refresh token with the correct scopes, no need to
// ask the user for offline access again.
return CheckResult.newAuthNotRequiredResult();
}
}
@Override
public boolean onUploadServerAuthCode(String idToken, String serverAuthCode) {
// Upload the serverAuthCode to the server, which will attempt to exchange it for
// a refresh token. This callback occurs on a background thread, so it is OK
// to perform synchronous network access. Returning 'false' will fail the
// GoogleApiClient.connect() call so if you would like the client to ignore
// server failures, always return true.
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(EXCHANGE_TOKEN_URL);
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("serverAuthCode", serverAuthCode));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpClient.execute(httpPost);
int statusCode = response.getStatusLine().getStatusCode();
final String responseBody = EntityUtils.toString(response.getEntity());
Log.i(TAG, "Code: " + statusCode);
Log.i(TAG, "Resp: " + responseBody);
// Show Toast on UI Thread
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, responseBody, Toast.LENGTH_LONG).show();
}
});
return (statusCode == 200);
} catch (ClientProtocolException e) {
Log.e(TAG, "Error in auth code exchange.", e);
return false;
} catch (IOException e) {
Log.e(TAG, "Error in auth code exchange.", e);
return false;
}
}
private void checkServerAuthConfiguration() {
// Check that the server URL is configured before allowing this box to
// be unchecked
if ("WEB_CLIENT_ID".equals(WEB_CLIENT_ID) ||
"SERVER_BASE_URL".equals(SERVER_BASE_URL)) {
Log.w(TAG, "WEB_CLIENT_ID or SERVER_BASE_URL configured incorrectly.");
Dialog dialog = new AlertDialog.Builder(this)
.setMessage(getString(R.string.configuration_error))
.setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.create();
dialog.show();
}
}
}