| /* |
| * Copyright 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.example.android.basicpermissions; |
| |
| import com.example.android.basicpermissions.camera.CameraPreviewActivity; |
| |
| import android.Manifest; |
| import android.app.Activity; |
| import android.content.Intent; |
| import android.content.pm.PackageManager; |
| import android.os.Build; |
| import android.os.Bundle; |
| import android.view.View; |
| import android.widget.Button; |
| import android.widget.Toast; |
| |
| /** |
| * Launcher Activity that demonstrates the use of runtime permissions for Android M. |
| * This Activity requests permissions to access the camera |
| * ({@link android.Manifest.permission#CAMERA}) |
| * when the 'Show Camera Preview' button is clicked to start {@link CameraPreviewActivity} once |
| * the permission has been granted. |
| * <p> |
| * First, the status of the Camera permission is checked using {@link |
| * Activity#checkSelfPermission(String)}. |
| * If it has not been granted ({@link PackageManager#PERMISSION_GRANTED}), it is requested by |
| * calling |
| * {@link Activity#requestPermissions(String[], int)}. The result of the request is returned in |
| * {@link Activity#onRequestPermissionsResult(int, String[], int[])}, which starts {@link |
| * CameraPreviewActivity} |
| * if the permission has been granted. |
| */ |
| public class MainActivity extends Activity { |
| |
| private static final int PERMISSION_REQUEST_CAMERA = 0; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.activity_main); |
| |
| // Register a listener for the 'Show Camera Preview' button. |
| Button b = (Button) findViewById(R.id.button_open_camera); |
| b.setOnClickListener(new View.OnClickListener() { |
| @Override |
| public void onClick(View view) { |
| showCameraPreview(); |
| } |
| }); |
| } |
| |
| @Override |
| public void onRequestPermissionsResult(int requestCode, String[] permissions, |
| int[] grantResults) { |
| // BEGIN_INCLUDE(onRequestPermissionsResult) |
| if (requestCode == PERMISSION_REQUEST_CAMERA) { |
| // Request for camera permission. |
| if (grantResults[0] == PackageManager.PERMISSION_GRANTED) { |
| // Permission has been granted. Start camera preview Activity. |
| Toast.makeText(this, "Camera permission was granted. Starting preview.", |
| Toast.LENGTH_SHORT) |
| .show(); |
| startCamera(); |
| } else { |
| // Permission request was denied. |
| Toast.makeText(this, "Camera permission request was denied.", Toast.LENGTH_SHORT) |
| .show(); |
| } |
| } |
| // END_INCLUDE(onRequestPermissionsResult) |
| } |
| |
| private void showCameraPreview() { |
| // BEGIN_INCLUDE(startCamera) |
| if (isMNC()) { |
| // On Android M and above, need to check if permission has been granted at runtime. |
| if (checkSelfPermission(Manifest.permission.CAMERA) |
| == PackageManager.PERMISSION_GRANTED) { |
| // Permission is available, start camera preview |
| startCamera(); |
| Toast.makeText(this, |
| "Camera permission has already been granted. Starting preview.", |
| Toast.LENGTH_SHORT).show(); |
| } else { |
| // Permission has not been granted and must be requested. |
| Toast.makeText(this, |
| "Permission is not available. Requesting camera permission.", |
| Toast.LENGTH_SHORT).show(); |
| requestPermissions(new String[]{Manifest.permission.CAMERA}, |
| PERMISSION_REQUEST_CAMERA); |
| } |
| } else { |
| /* |
| Below Android M all permissions have already been grated at install time and do not |
| need to verified or requested. |
| If a permission has been disabled in the system settings, the API will return |
| unavailable or empty data instead. */ |
| Toast.makeText(this, |
| "Requested permissions are granted at install time below M and are always " |
| + "available at runtime.", |
| Toast.LENGTH_SHORT).show(); |
| startCamera(); |
| } |
| // END_INCLUDE(startCamera) |
| } |
| |
| private void startCamera() { |
| Intent intent = new Intent(this, CameraPreviewActivity.class); |
| startActivity(intent); |
| } |
| |
| public static boolean isMNC() { |
| return Build.VERSION.SDK_INT >= Build.VERSION_CODES.M; |
| } |
| } |