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/*
* 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() {
/*
TODO: In the Android M Preview release, checking if the platform is M is done through
the codename, not the version code. Once the API has been finalised, the following check
should be used: */
// return Build.VERSION.SDK_INT >= Build.VERSION_CODES.MNC
return "MNC".equals(Build.VERSION.CODENAME);
}
}
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