如何使应用程序检查权限是否被授予（6，x +）Android

Question

我有一个短信应用程序，现在在6.0用户必须允许应用程序发送短信。 现在我有这个代码，我从link here得到。

int MY_PERMISSIONS_REQUEST_READ_CONTACTS=0; 
 
// Here, thisActivity is the current activity 
 
     if (ContextCompat.checkSelfPermission(this, 
 
       Manifest.permission.SEND_SMS) 
 
       != PackageManager.PERMISSION_GRANTED) { 
 

 
      // Should we show an explanation? 
 
      if (ActivityCompat.shouldShowRequestPermissionRationale(this, 
 
        Manifest.permission.SEND_SMS)) { 
 

 
       // Show an expanation to the user *asynchronously* -- don't block 
 
       // this thread waiting for the user's response! After the user 
 
       // sees the explanation, try again to request the permission. 
 

 
      } else { 
 

 
       // No explanation needed, we can request the permission. 
 

 
       ActivityCompat.requestPermissions(this, 
 
         new String[]{Manifest.permission.SEND_SMS}, 
 
         MY_PERMISSIONS_REQUEST_READ_CONTACTS); 
 

 
       // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an 
 
       // app-defined int constant. The callback method gets the 
 
       // result of the request. 
 
      } 
 
     }

但是，当我拒绝接取（如果用户不小心点击按钮）逝去的将几乎使应用程序崩溃（因为短信按钮不会工作）。因此，当用户在用户拒绝访问后启动/重新启动应用程序时，我希望应用程序再次提问。现在，当我尝试在我的模拟器上没有对话框会再次出现，所以我不得不去设置/应用程序并设置权限。或者卸载并重新安装。

Answer 1

您目前正在做的是询问用户权限，但不检查权限是否被实际授予。您可以通过在请求权限的活动中实施onRequestPermissionsResult方法来完成此操作。

有关更多信息，请参见https://stackoverflow.com/a/34722591/3872500。

Answer 2

使用不同的权限从你需要进行更改评论的工作应用的一个例子：？Android的棉花糖请求允许]

if (ContextCompat.checkSelfPermission(this, 
     Manifest.permission.ACCESS_COARSE_LOCATION) 
     != PackageManager.PERMISSION_GRANTED) { 
    progressLayout.setVisibility(View.GONE); 
    // Should we show an explanation? 
    if (ActivityCompat.shouldShowRequestPermissionRationale(this, 
      Manifest.permission.ACCESS_COARSE_LOCATION)) { 

     //This is where you need to ask again if they want to allow the permission, 
     //you should show a dialog here to ask if they're sure 
     //and explain why you need the permission. 
     requestDialog = new AlertDialog.Builder(this) 
       .setTitle(getString(R.string.device_setup_location_permission_title)) 
       .setMessage(getString(R.string.device_setup_location_permission_message)) 
       .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, int which) { 
         //They clicked yes, they want to enable the permission, 
         //so let's show them the dialog again. 
         ActivityCompat.requestPermissions(DeviceSetupActivity.this, 
           new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 
           REQUEST_LOCATION_RESPONSE); 
        } 
       }) 
       .setNegativeButton(getString(R.string.later), new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, int which) { 
         //This means they don't want to grant the permission, 
         //you should exit the app here, perhaps share another dialog saying that in 
         //order to use the app, the permission must be granted. 
         finish(); 
        } 
       }) 
       .show(); 

    } else { 

     // No explanation needed, we can request the permission. 

     ActivityCompat.requestPermissions(this, 
       new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 
       REQUEST_LOCATION_RESPONSE); 

     // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an 
     // app-defined int constant. The callback method gets the 
     // result of the request. 
    } 
} 

@Override 
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { 
    super.onRequestPermissionsResult(requestCode, permissions, grantResults); 
    if(requestCode == REQUEST_LOCATION_RESPONSE){ 
     if(hasPermission(Manifest.permission.ACCESS_COARSE_LOCATION)){ 
      startScan(); 
     }else{ 
      //exit the activity 
      finish(); 
     } 
    } 
} 

private boolean hasPermission(String perm) { 
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
     return(PackageManager.PERMISSION_GRANTED==checkSelfPermission(perm)); 
    } 
    return true; 
}