[英]how can i turn on both torch light(flash light) and back camera at the same time in android code
當我打開閃光燈時。 如果我使用 camera.release() 方法將相機用於拍攝閃光燈關閉的后置相機圖像,相機會停止。
switch1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@SuppressLint("MissingPermission")
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
camera = Camera.open(); // for camera on purpose
Camera.Parameters para = camera.getParameters();
para.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
camera.setParameters(para);
camera.startPreview();
cameraSource.release();
camera = null;
try {
cameraSource.start(surfaceView.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
// when I turned on the flash. the camera stops if I use camera.release() method to use the camera for back camera image taking the flash turns off.
在 API 23 或更高版本中
這就是你開啟的方式
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
CameraManager camManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
String cameraId = null;
try {
cameraId = camManager.getCameraIdList()[0];
camManager.setTorchMode(cameraId, true); //Turn ON
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
這就是你關閉的方式
camManager.setTorchMode(cameraId, false);
為此所需的權限
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.FLASHLIGHT"/>
完整的實現可能看起來像這樣
public class CameraAndFlashProvider {
private static final String TAG = FlashlightProvider.class.getSimpleName();
private Camera mCamera;
private Camera.Parameters parameters;
private CameraManager camManager;
private Context context;
public CameraAndFlashProvider(Context context) {
this.context = context;
}
private void turnFlashlightOn() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
try {
camManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
String cameraId = null;
if (camManager != null) {
cameraId = camManager.getCameraIdList()[0];
camManager.setTorchMode(cameraId, true);
}
} catch (CameraAccessException e) {
Log.e(TAG, e.toString());
}
} else {
mCamera = Camera.open();
parameters = mCamera.getParameters();
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
private void turnFlashlightOff() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
try {
String cameraId;
camManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
if (camManager != null) {
cameraId = camManager.getCameraIdList()[0]; // Usually front camera is at 0 position.
camManager.setTorchMode(cameraId, false);
}
} catch (CameraAccessException e) {
e.printStackTrace();
}
} else {
mCamera = Camera.open();
parameters = mCamera.getParameters();
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
mCamera.setParameters(parameters);
mCamera.stopPreview();
}
}
}
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