[英]Opening Flashlight of Galaxy Nexus
我正在開發一款需要打開Galaxy Nexus設備手電筒的應用程序。 我在這里提到了這個帖子
Galaxy Nexus上的LED手電筒可通過什么API控制?
public class TestCamera extends Activity implements SurfaceHolder.Callback{
Camera mCamera;
public static SurfaceView preview;
public static SurfaceHolder mHolder;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
preview = (SurfaceView) findViewById(R.id.camSurface);
mHolder = preview.getHolder();
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(mHolder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Button onLEDbtn = (Button) findViewById(R.id.onLED_btn);
onLEDbtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "test", Toast.LENGTH_SHORT).show();
Parameters params = mCamera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(params);
mCamera.startPreview();
}
});
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
mHolder = holder;
try {
mCamera.setPreviewDisplay(mHolder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
mCamera.stopPreview();
mHolder = null;
}
}
表現:
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
但是,我仍然無法打開手電筒。 誰能指出我的錯誤? 謝謝
你必須設置回調mHolder.addCallback(this);
嘗試添加:
android:name="android.permission.FLASHLIGHT"
android:name="android.hardware.camera.flash
看看這篇文章: 如何在Android中以編程方式打開相機閃光燈?
您需要在清單文件中添加此標記。
<uses-feature android:name="android.hardware.camera.flash"/>
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.