我正在开发一个需要用户的多个权限（位置、外部存储、相机和手机状态）的应用程序，如果我一个接一个地发出请求，那么当我运行该应用程序时，只会向用户询问一个权限，这是一个问题：
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
//ask for the location permission
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION}, 123);
}
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
//ask for the location permission
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);
}
if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED
|| ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
PERMISSION_EXTERNAL, REQUEST_EXTERNAL_STORAGE);
}
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE)!= PackageManager.PERMISSION_GRANTED)
{
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_PHONE_STATE}, REQUEST_PHONE_STATE);
}
进行多次测试来创建一个字符串，其中所有需要的权限请求都非常烦人，我尝试只请求权限，而不测试它们是否通过 checkSelfPermision 方法授予：
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.READ_PHONE_STATE}, REQUEST_MULTIPLE);
它可以工作，它会一个接一个地堆叠所有不同的请求，如果我重新运行应用程序，它不会再次询问，因为权限已被授予，如果我手动删除其中一个权限，应用程序只要求我已经删除了一个。
那么如果不使用 checkSelfPermission 测试一切都正常，那么这个方法有什么用呢？是否存在我错过或没有意识到的风险？
@Waylan 这里有一个或两个非常有用的链接，我将发布一些代码来帮助您处理用户可以与他们选择的内容交互的三种方式中的哪一种。 即首先拒绝允许和不再询问链接
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
//.... write file into storage ...
System.out.println("SDK > BuildVersion TRUE");
} else {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 666); // Comment 26
System.out.println("go to requestPermissions");
}
}
onLoad();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case 666: // Allowed was selected so Permission granted
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Snackbar s = Snackbar.make(findViewById(android.R.id.content),"Permission Granted",Snackbar.LENGTH_LONG);
View snackbarView = s.getView();
TextView textView = (TextView) snackbarView.findViewById(android.support.design.R.id.snackbar_text);
textView.setTextColor(Color.RED);
textView.setTextSize(18);
textView.setMaxLines(6);
s.show();
// do your work here
} else if (Build.VERSION.SDK_INT >= 23 && !shouldShowRequestPermissionRationale(permissions[0])) {
// User selected the Never Ask Again Option Change settings in app settings manually
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setTitle("Change Permissions in Settings");
alertDialogBuilder
.setMessage("" +
"\nClick SETTINGS to Manually Set\n"+"Permissions to use Database Storage")
.setCancelable(false)
.setPositiveButton("SETTINGS", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", getPackageName(), null);
intent.setData(uri);
startActivityForResult(intent, 1000); // Comment 3.
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
} else {
// User selected Deny Dialog to EXIT App ==> OR <== RETRY to have a second chance to Allow Permissions
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setTitle("Second Chance");
alertDialogBuilder
.setMessage("Click RETRY to Set Permissions to Allow\n\n"+"Click EXIT to the Close App")
.setCancelable(false)
.setPositiveButton("RETRY", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, Integer.parseInt(WRITE_EXTERNAL_STORAGE));
Intent i = new Intent(MainActivity.this,MainActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
}
})
.setNegativeButton("EXIT", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
finish();
dialog.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
}
break;
}};
它允许您查看是否需要请求权限，如果您想首先向用户显示另一个屏幕，解释为什么需要这些权限，这非常有用。