Android 运行时检查权限未显示
我试图在API 23上简单地从Emulator访问联系人,但无法在运行时检查权限。这是代码 我在清单中添加了Android 运行时检查权限未显示,android,android-permissions,Android,Android Permissions,我试图在API 23上简单地从Emulator访问联系人,但无法在运行时检查权限。这是代码 我在清单中添加了 <uses-permission android:name="android.permission.READ_CONTACTS"/> 主要内容` <ListView android:id="@+id/contact_names" android:layout_width="0dp" android:layout_height="0dp
<uses-permission android:name="android.permission.READ_CONTACTS"/>
主要内容`
<ListView
android:id="@+id/contact_names"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="16dp"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
<TextView
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView"
tools:text="TextView"/>
联系_detail.xml`
<ListView
android:id="@+id/contact_names"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="16dp"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
<TextView
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView"
tools:text="TextView"/>
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private ListView contactNames;
private static final int REQUEST_CODE_READ_CONTACTS = 1;
private static boolean READ_CONTACTS_GRANTED = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
contactNames = (ListView) findViewById(R.id.contact_names);
int hasReadContactPermission = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS);
Log.d(TAG, "onCreate: checkSelfPermission "+ hasReadContactPermission);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.d(TAG, "fab onClick: starts");
String[] projection={ContactsContract.Contacts.DISPLAY_NAME_PRIMARY};
ContentResolver contentResolver = getContentResolver();
Cursor cursor = contentResolver.query(ContactsContract.Contacts.CONTENT_URI,
projection,
null,
null,
ContactsContract.Contacts.DISPLAY_NAME_PRIMARY);
if(cursor!=null){
List<String> contacts=new ArrayList<String>();
while (cursor.moveToNext()){
contacts.add(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)));
}
cursor.close();
ArrayAdapter<String> adapter=new ArrayAdapter<String>(MainActivity.this,R.layout.contact_detail,R.id.name,contacts);
contactNames.setAdapter(adapter);
}
Log.d(TAG, "fab onClick: ends");
}
});
Log.d(TAG, "onCreate: ends");
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
Log.d(TAG, "onRequestPermissionsResult: starts");
switch (requestCode){
case REQUEST_CODE_READ_CONTACTS:{
//if request canclled then ResultArray is Empty
if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
//permission granted,do the contacts related task you need to do
Log.d(TAG, "onRequestPermissionsResult: permission granted");
READ_CONTACTS_GRANTED = true;
}else {
//permission denied
//disabled the functionalities that depends on this permission
Log.d(TAG, "onRequestPermissionsResult: permission refused");
}
}
}
Log.d(TAG, "onRequestPermissionsResult: ends");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.o`enter code here`nOptionsItemSelected(item);
}
public类MainActivity扩展了AppCompatActivity{
私有静态最终字符串TAG=“MainActivity”;
私有列表视图联系人姓名;
私有静态最终整数请求\代码\读取\联系人=1;
私有静态布尔READ\u CONTACTS\u grated=false;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar Toolbar=(Toolbar)findViewById(R.id.Toolbar);
设置支持操作栏(工具栏);
contactNames=(ListView)findViewById(R.id.contact\u name);
int hasReadContactPermission=ContextCompat.checkSelfPermission(这是Manifest.permission.READ\u CONTACTS);
Log.d(标记“onCreate:checkSelfPermission”+hasReadContactPermission);
FloatingActionButton fab=(FloatingActionButton)findViewById(R.id.fab);
fab.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
Log.d(标记“fab onClick:starts”);
String[]projection={ContactsContract.Contacts.DISPLAY\u NAME\u PRIMARY};
ContentResolver ContentResolver=getContentResolver();
Cursor Cursor=contentResolver.query(ContactsContract.Contacts.CONTENT\u URI,
投影,
无效的
无效的
联系人contract.Contacts.DISPLAY\u NAME\u PRIMARY);
如果(光标!=null){
列表联系人=新建ArrayList();
while(cursor.moveToNext()){
contacts.add(cursor.getString(cursor.getColumnIndex(ContactsContract.contacts.DISPLAY_NAME));
}
cursor.close();
ArrayAdapter=新的ArrayAdapter(MainActivity.this,R.layout.contact_detail,R.id.name,contacts);
contactNames.setAdapter(适配器);
}
Log.d(标记“fab onClick:ends”);
}
});
Log.d(标记“onCreate:ends”);
}
@凌驾
public void onRequestPermissionsResult(int-requestCode,@NonNull-String[]permissions,@NonNull-int[]grantResults){
Log.d(标记“onRequestPermissionsResult:starts”);
开关(请求代码){
案例请求\代码\读取\联系人:{
//如果取消请求,则ResultArray为空
if(grantResults.length>0&&grantResults[0]==PackageManager.PERMISSION\u已授予){
//授予权限后,执行需要执行的联系人相关任务
Log.d(标记“onRequestPermissionsResult:已授予的权限”);
READ_CONTACTS_grated=true;
}否则{
//拒绝许可
//已禁用依赖于此权限的功能
Log.d(标记“onRequestPermissionsResult:permission Deceed”);
}
}
}
Log.d(标记“onRequestPermissionsResult:ends”);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(右菜单菜单菜单主菜单);
返回true;
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//处理操作栏项目单击此处。操作栏将
//自动处理Home/Up按钮上的点击,只要
//在AndroidManifest.xml中指定父活动时。
int id=item.getItemId();
//noinspection SimplifiableIf语句
if(id==R.id.action\u设置){
返回true;
}
返回super.o`在此处输入代码`nOptionsItemSelected(项目);
}
}
每当我单击浮动操作按钮时,应用程序就会崩溃。如果您没有权限,它将返回false,然后请求权限
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.READ_CONTACTS},
1);
然后它将显示弹出窗口。您需要首先使用onClick中的以下示例代码请求权限-
if (hasWriteContactsPermission != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[] {Manifest.permission.WRITE_CONTACTS},
REQUEST_CODE_ASK_PERMISSIONS);
return;
}
insertDummyContact();
您可以从生成两种方法中了解更多信息,并单击晶圆厂检查版本(将此调用放在onClickListener中) 两种方法是:
public boolean checkPermissionForContact(){
int result = ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_CONTACTS);
if(result == PackageManager.PERMISSION_GRANTED){
return true;
}else{
return false;
}
}
public void requestPersmissionForContacts(){
if(ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.READ_CONTACTS)){
Toast.makeText(MainActivity.this, "Contact Reading Permission needed. Please allow in App Settings for addition functionality.",Toast.LENGTH_LONG).show();
}else {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.READ_CONTACTS}, CONTACTS_PERMISSION_REQUEST_CODE);
}
}
你只是在检查权限,如果没有权限,你在哪里打电话来获得权限?它正在工作,但你能解释一下吗?谢谢你。你能告诉我在哪里可以像你一样学习Android开发吗?你有网站或博客吗?如果有帮助的话接受答案:)没有,我没有任何网站或博客,我正在制作一个网站。