本文介紹了如何在android中同時打開手電筒和前置攝像頭的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
在我的應用程序的一個要求中，我需要彈出一個包含前置攝像頭預覽的活動，同時我還需要打開手電筒.但是我觀察到，我能夠打開手電筒和后置攝像頭，但不是前置攝像頭和手電筒.以下是我的代碼:
In one of the requirement in my app I need to pop up an activity containing the front camera preview,at this same time I need to turn on the flashlight as well.However I observe that,I am able to turn on the flashlight and back camera but not front camera and flashlight together.Following is my code:
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);
}
}
}
清單
<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" />
如何同時打開手電筒和前置攝像頭?任何幫助將不勝感激！
How can I turn on the flashlight and front cam simultaneously? Any help would be appreciated !
推薦答案
手電筒
public void onToggleClicked(View view) {
PackageManager pm = context.getPackageManager();
final Parameters p = camera.getParameters();
if (isFlashSupported(pm)) {
boolean on = ((ToggleButton) view).isChecked();
if (on) {
Log.i("info", "torch is turn on!");
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
camera.startPreview();
} else {
Log.i("info", "torch is turn off!");
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
camera.stopPreview();
}
相機:
ImageButton ib = (ImageButton) findViewById(R.id.buttonToast);
ib.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(i, CAPTURE_IMAGE_CAPTURE_CODE);
}
});
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