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-rw-r--r--samples/browseable/RuntimePermissionsBasic/src/com.example.android.basicpermissions/MainActivity.java109
1 files changed, 64 insertions, 45 deletions
diff --git a/samples/browseable/RuntimePermissionsBasic/src/com.example.android.basicpermissions/MainActivity.java b/samples/browseable/RuntimePermissionsBasic/src/com.example.android.basicpermissions/MainActivity.java
index 9fa646d7e..f534d4077 100644
--- a/samples/browseable/RuntimePermissionsBasic/src/com.example.android.basicpermissions/MainActivity.java
+++ b/samples/browseable/RuntimePermissionsBasic/src/com.example.android.basicpermissions/MainActivity.java
@@ -20,13 +20,15 @@ import com.example.android.basicpermissions.camera.CameraPreviewActivity;
import android.Manifest;
import android.app.Activity;
+import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
-import android.os.Build;
import android.os.Bundle;
+import android.support.design.widget.Snackbar;
+import android.support.v4.app.ActivityCompat;
+import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
-import android.widget.Toast;
/**
* Launcher Activity that demonstrates the use of runtime permissions for Android M.
@@ -36,22 +38,32 @@ import android.widget.Toast;
* the permission has been granted.
* <p>
* First, the status of the Camera permission is checked using {@link
- * Activity#checkSelfPermission(String)}.
+ * ActivityCompat#checkSelfPermission(Context, 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.
+ * {@link ActivityCompat#requestPermissions(Activity, String[], int)}. The result of the request is
+ * returned to the
+ * {@link android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback}, which starts
+ * {@link
+ * CameraPreviewActivity} if the permission has been granted.
+ * <p>
+ * Note that there is no need to check the API level, the support library
+ * already takes care of this. Similar helper methods for permissions are also available in
+ * ({@link ActivityCompat},
+ * {@link android.support.v4.content.ContextCompat} and {@link android.support.v4.app.Fragment}).
*/
-public class MainActivity extends Activity {
+public class MainActivity extends AppCompatActivity
+ implements ActivityCompat.OnRequestPermissionsResultCallback {
private static final int PERMISSION_REQUEST_CAMERA = 0;
+ private View mLayout;
+
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
+ mLayout = findViewById(R.id.main_layout);
// Register a listener for the 'Show Camera Preview' button.
Button b = (Button) findViewById(R.id.button_open_camera);
@@ -69,15 +81,16 @@ public class MainActivity extends Activity {
// BEGIN_INCLUDE(onRequestPermissionsResult)
if (requestCode == PERMISSION_REQUEST_CAMERA) {
// Request for camera permission.
- if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+ if (grantResults.length == 1 && 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)
+ Snackbar.make(mLayout, "Camera permission was granted. Starting preview.",
+ Snackbar.LENGTH_SHORT)
.show();
startCamera();
} else {
// Permission request was denied.
- Toast.makeText(this, "Camera permission request was denied.", Toast.LENGTH_SHORT)
+ Snackbar.make(mLayout, "Camera permission request was denied.",
+ Snackbar.LENGTH_SHORT)
.show();
}
}
@@ -86,43 +99,52 @@ public class MainActivity extends Activity {
private void showCameraPreview() {
// BEGIN_INCLUDE(startCamera)
- if (!isMNC()) {
- // Below Android M there is no need to check for runtime permissions
- Toast.makeText(this,
- "Requested permissions are granted at install time below M and are always "
- + "available at runtime.",
- Toast.LENGTH_SHORT).show();
+ // Check if the Camera permission has been granted
+ if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
+ == PackageManager.PERMISSION_GRANTED) {
+ // Permission is already available, start camera preview
+ Snackbar.make(mLayout,
+ "Camera permission is available. Starting preview.",
+ Snackbar.LENGTH_SHORT).show();
startCamera();
- return;
+ } else {
+ // Permission is missing and must be requested.
+ requestCameraPermission();
}
+ // END_INCLUDE(startCamera)
+ }
- // Check if the Camera permission has been granted
- if (checkSelfPermission(Manifest.permission.CAMERA)
- != PackageManager.PERMISSION_GRANTED) {
- // Permission has not been granted and must be requested.
+ /**
+ * Requests the {@link android.Manifest.permission#CAMERA} permission.
+ * If an additional rationale should be displayed, the user has to launch the request from
+ * a SnackBar that includes additional information.
+ */
+ private void requestCameraPermission() {
+ // Permission has not been granted and must be requested.
+ if (ActivityCompat.shouldShowRequestPermissionRationale(this,
+ Manifest.permission.CAMERA)) {
+ // Provide an additional rationale to the user if the permission was not granted
+ // and the user would benefit from additional context for the use of the permission.
+ // Display a SnackBar with a button to request the missing permission.
+ Snackbar.make(mLayout, "Camera access is required to display the camera preview.",
+ Snackbar.LENGTH_INDEFINITE).setAction("OK", new View.OnClickListener() {
+ @Override
+ public void onClick(View view) {
+ // Request the permission
+ ActivityCompat.requestPermissions(MainActivity.this,
+ new String[]{Manifest.permission.CAMERA},
+ PERMISSION_REQUEST_CAMERA);
+ }
+ }).show();
- if (shouldShowRequestPermissionRationale(
- Manifest.permission.CAMERA)) {
- // Provide an additional rationale to the user if the permission was not granted
- // and the user would benefit from additional context for the use of the permission.
- Toast.makeText(this, "Camera access is required to display a camera preview.",
- Toast.LENGTH_SHORT).show();
- }
- Toast.makeText(this,
+ } else {
+ Snackbar.make(mLayout,
"Permission is not available. Requesting camera permission.",
- Toast.LENGTH_SHORT).show();
-
- // Request the permission. The result will be received in onRequestPermissionResult()
- requestPermissions(new String[]{Manifest.permission.CAMERA},
+ Snackbar.LENGTH_SHORT).show();
+ // Request the permission. The result will be received in onRequestPermissionResult().
+ ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA},
PERMISSION_REQUEST_CAMERA);
- } else {
- // Permission is already available, start camera preview
- startCamera();
- Toast.makeText(this,
- "Camera permission is available. Starting preview.",
- Toast.LENGTH_SHORT).show();
}
- // END_INCLUDE(startCamera)
}
private void startCamera() {
@@ -130,7 +152,4 @@ public class MainActivity extends Activity {
startActivity(intent);
}
- public static boolean isMNC() {
- return Build.VERSION.SDK_INT >= Build.VERSION_CODES.M;
- }
}
generated by cgit v1.2.3 (git 2.25.1) at 2026-10-14 09:42:27 +0000