API<23的java Android PermissionsDispatcher
我使用hotchemi PermissionsDispatcher检查权限。它适用于API>;=但我有个致命的例外。当我试图在API 16设备上使用相同的代码时。
当我在生成的类MainActivityPermissionsDispatcher
中调用showCameraWithCheck()
时,会出现错误
我深入研究了PermissionsDispatcher库生成的类MainActivityPermissionsDispatcher
,发现了堆栈溢出发生的原因。当我调用MainActivityPermissionsDispatcher.showCameraWithCheck(this);
时,它在生成的MainActivityPermissionsDispatcher
中转到这个方法:
static void showCameraWithCheck(MainActivity target) {
if (PermissionUtils.hasSelfPermissions(target, PERMISSION_SHOWCAMERA)) {
target.showCamera();
} else {
if (PermissionUtils.shouldShowRequestPermissionRationale(target, PERMISSION_SHOWCAMERA)) {
target.showRationaleForCamera(new ShowCameraPermissionRequest(target));
} else {
ActivityCompat.requestPermissions(target, PERMISSION_SHOWCAMERA, REQUEST_SHOWCAMERA);
}
}
}
问题是PermissionUtils.hasSelfPermissions(target, PERMISSION_SHOWCAMERA)
总是正确的,所以它被称为target.showCamera()
,这是我的方法,它被称为MainActivityPermissionsDispatcher.showCameraWithCheck(this);
,所以它进入了一个无止境的循环。。。。我猜hasSelfPermissions()
方法会检查它是运行时权限(API>;=23)还是旧式权限(API<;23)
E/AndroidRuntime: FATAL EXCEPTION: main java.lang.StackOverflowError at 安卓.os.Parcel.readException(Parcel.java:1376) at 安卓.app.ActivityManagerProxy.checkPermission(ActivityManagerNative.java:2874) at 安卓.app.ContextImpl.checkPermission(ContextImpl.java:1285) at 安卓.content.ContextWrapper.checkPermission(ContextWrapper.java:421) at 安卓.support.v4.content.PermissionChecker.checkPermission(PermissionChecker.java:89) at 安卓.support.v4.content.PermissionChecker.checkSelfPermission(PermissionChecker.java:125) at permissions.dispatcher.PermissionUtils.hasSelfPermissions(PermissionUtils.java:73) at com.example.安卓.permissionsdispatcherapp.MainActivityPermissionsDispatcher.showCameraWithCheck(MainActivityPermissionsDispatcher.java:20) at com.example.安卓.permissionsdispatcherapp.MainActivity.showCamera(MainActivity.java:52) ......................
@RuntimePermissions
public class MainActivity extends AppCompatActivity {
private static String LOG_TAG = MainActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
Button btnShowCamera = (Button) findViewById(R.id.btn_show_camera);
btnShowCamera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.i(LOG_TAG, "Show camera button pressed.");
showCamera();
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
@NeedsPermission(Manifest.permission.CAMERA)
void showCamera() {
// NOTE: delegate the permission handling to generated method
// ERROR
MainActivityPermissionsDispatcher.showCameraWithCheck(this);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
// NOTE: delegate the permission handling to generated method
MainActivityPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults);
}
@OnPermissionDenied(Manifest.permission.CAMERA)
void onCameraDenied() {
// NOTE: Deal with a denied permission, e.g. by showing specific UI
// or disabling certain functionality
Toast.makeText(this, R.string.permission_camera_denied, Toast.LENGTH_LONG).show();
}
@OnNeverAskAgain(Manifest.permission.CAMERA)
void onCameraNeverAskAgain() {
Toast.makeText(this, R.string.permission_camera_never_askagain, Toast.LENGTH_LONG).show();
}
@OnShowRationale(Manifest.permission.CAMERA)
void showRationaleForCamera(PermissionRequest request) {
// NOTE: Show a rationale to explain why the permission is needed, e.g. with a dialog.
// Call proceed() or cancel() on the provided PermissionRequest to continue or abort
showRationaleDialog(R.string.permission_camera_rationale, request);
}
private void showRationaleDialog(@StringRes int messageResId, final PermissionRequest request) {
new AlertDialog.Builder(this)
.setPositiveButton(R.string.button_allow, new DialogInterface.OnClickListener() {
@Override
public void onClick(@NonNull DialogInterface dialog, int which) {
request.proceed();
}
})
.setNegativeButton(R.string.button_deny, new DialogInterface.OnClickListener() {
@Override
public void onClick(@NonNull DialogInterface dialog, int which) {
request.cancel();
}
})
.setCancelable(false)
.setMessage(messageResId)
.show();
}
}
enter code here
# 1 楼答案
找到了路。我的密码错了。 它不需要调用
showCamera()
方法,因为生成的类MainActivityPermissionsDispatcher
已经调用了它。由于API 16没有运行时权限,因此它以这个无终止循环结束以下是修复方法: