私のアプリの要件の 1 つで、前面カメラのプレビューを含むアクティビティをポップアップする必要があります。同時に、懐中電灯もオンにする必要があります。ただし、懐中電灯をオンにして戻ることができます。カメラですが、フロントカメラと懐中電灯は一緒ではありません.以下は私のコードです:
public class Cam extends Activity {
private static int cameraId = 0;
private Camera camera;
//Adding for camera preview
public static FrameLayout preview;
public static CameraPreview mPreview;
Context context;
ImageButton btnSwitch;
private boolean isFlashOn;
private boolean hasFlash;
Parameters params;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.e("Cam","Inside onCreate");
setContentView(R.layout.cam);
context = getApplicationContext();
btnSwitch = (ImageButton) findViewById(R.id.btnSwitch);
hasFlash = getApplicationContext().getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
startCamera();
// displaying button image
toggleButtonImage();
btnSwitch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (isFlashOn) {
turnOffFlash();
} else {
turnOnFlash();
}
}
});
}
@Override
protected void onPause() {
super.onPause();
turnOffFlash();
Log.e("Cam","Inside onPause");
try {
if (camera != null) {
camera.release();
camera = null;
preview.removeView(mPreview);
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void onResume() {
super.onResume();
Log.e("Cam","Inside onResume");
try {
if(camera ==null) {
Log.d("Cam","in resume,camera is null");
try {
camera = android.hardware.Camera.open(cameraId); //opens front cam
// camera = Camera.open(); when I use this I can on/off the flashlight,since I am using the back camera.
mPreview = new CameraPreview(this, camera);
preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mPreview);
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.e("Cam","Inside onDestroy");
if (camera != null) {
try {
camera.release();
camera = null;
preview.removeView(mPreview);
} catch (Exception e) {
e.printStackTrace();
}
}
}
private void startCamera() {
Log.e("Cam","Inside doInBackground");
String msg = "";
// Do we have a camera?
try {
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
} else {
cameraId = AppFunctions.findFrontFacingCamera();//A function that returns 0 for front camera
if (cameraId < 0) {
} else {
try {
camera = Camera.open(cameraId);//opens front cam
// camera = Camera.open(); when I use this I can on/off the flashlight,since I am calling the back camera.
params = camera.getParameters();
Log.e("Cam","camera id" + cameraId);
Log.e("Cam","params" + params);
} catch (Exception e) {
e.printStackTrace();
}
try {
mPreview = new CameraPreview(getApplicationContext(), camera);
preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mPreview);
} catch (Exception e) {
e.printStackTrace();
}
}
}
} catch (Exception e3) {
e3.printStackTrace();
}
}
private void turnOnFlash() {
Log.v("Cam","Inside turnOnFlash");
if (!isFlashOn) {
if (camera == null || params == null) {
Log.v("Cam","camera or param is null");
return;
}
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(params);
camera.startPreview();
isFlashOn = true;
// changing button/switch image
toggleButtonImage();
}
}
/*
* Turning Off flash
*/
private void turnOffFlash() {
Log.v("Cam","Inside turnOffFlash");
if (isFlashOn) {
if (camera == null || params == null) {
Log.v("Cam","camera or param is null");
return;
}
params.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(params);
camera.stopPreview();
isFlashOn = false;
// changing button/switch image
toggleButtonImage();
}
}
private void toggleButtonImage(){
if(isFlashOn){
btnSwitch.setImageResource(R.drawable.btn_switch_on);
}else{
btnSwitch.setImageResource(R.drawable.btn_switch_off);
}
}
}
マニフェスト
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.front" />
<permission android:name="android.permission.FLASHLIGHT" />
懐中電灯とフロントカメラを同時にオンにするにはどうすればよいですか? どんな助けでも大歓迎です!