Android 登录屏幕显示progressdialog并允许更改屏幕方向
你好，我正在尝试实现一个登录屏幕，显示一个进度对话框，并允许手机旋转 我想问一下什么是最好的方法（IntentService、AsyncTask、Service）并允许手机旋转 我读了很多答案，用AsyncTask等空片段说了不同的事情。你试过这个吗Android 登录屏幕显示progressdialog并允许更改屏幕方向,android,android-asynctask,android-intentservice,Android,Android Asynctask,Android Intentservice,你好，我正在尝试实现一个登录屏幕，显示一个进度对话框，并允许手机旋转 我想问一下什么是最好的方法（IntentService、AsyncTask、Service）并允许手机旋转 我读了很多答案，用AsyncTask等空片段说了不同的事情。你试过这个吗 <activity android:name=".MainActivity" android:configChanges="orientation|screenSize"> </activity> 这样
<activity
android:name=".MainActivity"
android:configChanges="orientation|screenSize">
</activity>
这样就不会重新创建活动。但是您可以使用
onConfigurationChanged（）android:configChanges=“orientation”AndroidManifest.xml在AsyncTask对象的onPreExecute方法中显示ProgressDialog，并在onPostExecute方法中取消ProgressDialog。更改方向时，doInBackground方法正在运行。您可以在清单中执行类似操作以允许旋转：
<application
android:allowBackup="true"
android:configChanges="orientation|keyboardHidden|screenSize"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity
android:name=".activities.MainActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="@string/app_name"/>
private ProgressDialog pDialog;
private class MyAsync extends AsyncTask<String, Void, String> {
Activity context;
public MyAsync (Activity context) {
this.context = context;
}
@Override
protected void onPreExecute(){
super.onPreExecute();
pdia = new ProgressDialog(context);
pdia.setMessage("Loading...");
pdia.show();
}
@Override
protected String doInBackground(String... urls) {
...
//do your login scheme
...
//context.methods()
return "ok";
}
@Override
protected void onPostExecute(String result) {
pDialog.dismiss();
if(result!=null && result.equals("ok")){
//login was successfully done
} else {
//login has failed
}
}
}
这是您的活动/片段。有关详细答案，请参阅
基本上，您可以在LoginActivity中使用将setRetainInstance设置为true的fragment，这样在方向更改期间重新创建活动时，它就不会被破坏
示例代码：
public class AsyncFragment extends Fragment {
private LoginTask mTask;
private AsyncTaskListener mListener;
private static final String TAG = "AsyncFragment";
private boolean isTaskRunning = false;
private ProgressDialog mProgressDialog;
FrameLayout mLayout;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
mTask = new LoginTask();
mTask.execute();
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mLayout = new FrameLayout(getActivity());
mLayout.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
if(isTaskRunning) {
mProgressDialog = new ProgressDialog(getActivity());
mProgressDialog.show();
}
return mLayout;
}
@Override
public void onDestroyView() {
if(mProgressDialog != null && mProgressDialog.isShowing()) {
mProgressDialog.dismiss();
mProgressDialog = null;
}
super.onDestroyView();
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
try {
mListener = (AsyncTaskListener) context;
} catch (ClassCastException e) {
Log.d(TAG, "Class not instance of AsyncTaskListener");
}
}
@Override
public void onDetach() {
mListener = null;
super.onDetach();
}
private class LoginTask extends AsyncTask<Void,Integer,Void> {
@Override
protected Void doInBackground(Void... params) {
if(mListener != null) {
mListener.onBackground();
}
SystemClock.sleep(10000);
return null;
}
@Override
protected void onPreExecute() {
isTaskRunning = true;
mProgressDialog = new ProgressDialog(getActivity());
mProgressDialog.show();
if(mListener != null) {
mListener.onPreExecute();
}
super.onPreExecute();
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
if(mListener != null) {
mListener.onPostExecute();
}
isTaskRunning = false;
if(mProgressDialog != null && mProgressDialog.isShowing()) {
mProgressDialog.dismiss();
mProgressDialog = null;
}
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
if(mListener != null) {
mListener.onProgressUpdate(values[0]);
}
}
@Override
protected void onCancelled() {
super.onCancelled();
if(mListener != null) {
mListener.onCancelled();
}
}
}
//Listener to notify for async task callbacks
public interface AsyncTaskListener{
void onPreExecute();
void onPostExecute();
void onCancelled();
void onBackground();
void onProgressUpdate(int progress);
}
}
你能解释一下你想做什么吗？@Singh我想用显示progressdialog的服务器登录，并允许手机在不终止登录操作的情况下旋转。技术上，有一个解决方案使用三个Android构建块中的每一个。我可以建议IntentService与活动的生命周期联系最少。。。但是，通过广播将其连接起来比使用异步任务更为棘手。一个SO问题最好尝试这些方法中的一种，社区可以从中提供帮助。
new MyAsync(this).execute(null, null , null);
public class AsyncFragment extends Fragment {
private LoginTask mTask;
private AsyncTaskListener mListener;
private static final String TAG = "AsyncFragment";
private boolean isTaskRunning = false;
private ProgressDialog mProgressDialog;
FrameLayout mLayout;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
mTask = new LoginTask();
mTask.execute();
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mLayout = new FrameLayout(getActivity());
mLayout.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
if(isTaskRunning) {
mProgressDialog = new ProgressDialog(getActivity());
mProgressDialog.show();
}
return mLayout;
}
@Override
public void onDestroyView() {
if(mProgressDialog != null && mProgressDialog.isShowing()) {
mProgressDialog.dismiss();
mProgressDialog = null;
}
super.onDestroyView();
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
try {
mListener = (AsyncTaskListener) context;
} catch (ClassCastException e) {
Log.d(TAG, "Class not instance of AsyncTaskListener");
}
}
@Override
public void onDetach() {
mListener = null;
super.onDetach();
}
private class LoginTask extends AsyncTask<Void,Integer,Void> {
@Override
protected Void doInBackground(Void... params) {
if(mListener != null) {
mListener.onBackground();
}
SystemClock.sleep(10000);
return null;
}
@Override
protected void onPreExecute() {
isTaskRunning = true;
mProgressDialog = new ProgressDialog(getActivity());
mProgressDialog.show();
if(mListener != null) {
mListener.onPreExecute();
}
super.onPreExecute();
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
if(mListener != null) {
mListener.onPostExecute();
}
isTaskRunning = false;
if(mProgressDialog != null && mProgressDialog.isShowing()) {
mProgressDialog.dismiss();
mProgressDialog = null;
}
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
if(mListener != null) {
mListener.onProgressUpdate(values[0]);
}
}
@Override
protected void onCancelled() {
super.onCancelled();
if(mListener != null) {
mListener.onCancelled();
}
}
}
//Listener to notify for async task callbacks
public interface AsyncTaskListener{
void onPreExecute();
void onPostExecute();
void onCancelled();
void onBackground();
void onProgressUpdate(int progress);
}
}
public class MainActivity extends AppCompatActivity implements AsyncFragment.AsyncTaskListener{
private static final String FRAGMENT_TAG = "asyncFragment";
private static final String TAG = "MainActivity";
private AsyncFragment mAsyncFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FragmentManager fm = getSupportFragmentManager();
mAsyncFragment = (AsyncFragment) fm.findFragmentByTag(FRAGMENT_TAG);
if (mAsyncFragment == null) { //fragment was retained during orientation change
mAsyncFragment = new AsyncFragment();
fm.beginTransaction().add(mAsyncFragment, FRAGMENT_TAG).commit();
}
}
@Override
public void onPreExecute() {
Log.d(TAG, "onPreExecute: ");
}
@Override
public void onPostExecute() {
Log.d(TAG, "onPostExecute: ");
}
@Override
public void onCancelled() {
Log.d(TAG, "onCancelled: ");
}
@Override
public void onBackground() {
Log.d(TAG, "onBackground: ");
}
@Override
public void onProgressUpdate(int progress) {
Log.d(TAG, "onProgressUpdate: ");
}