相关疑难解决方法(0)

我有以下问题:我的手电筒应用程序在我的三星Galaxy S2上工作正常但不幸的是没有在三星Galaxy Nexus上(问题:手电筒忽略按钮点击 - >没有反应,没有光,没有崩溃,也没有例外).我读过"Galaxy Nexus上的LED手电筒可以通过哪种API控制？" 这里在stackoverflow但它没有帮助我,因为我的问题仍然发生.这是我控制灯光的代码片段:

final Button FlashLightControl = (Button)findViewById(R.id.ledbutton);
FlashLightControl.setOnClickListener(new Button.OnClickListener()
{
        public void onClick(View arg) 
        {
            if(camera != null)
            {
                //in case light is on we will turn it off
                parameters = camera.getParameters();
                parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
                camera.setParameters(parameters);
                camera.stopPreview();
                camera.release();
                camera = null;
            }
            else
            {
                // light is off - we turn it on
                camera = Camera.open();
                parameters = camera.getParameters();
                parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
                camera.setParameters(parameters);
                camera.startPreview();
            }
        }}); 

有任何想法吗？为了完整起见 - 这些是我添加到Androidmanifest.xml的权限:

    <uses-feature android:name="android.hardware.camera.flash" />
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/> …

我正在开发一款需要打开Galaxy Nexus设备手电筒的应用程序.我在这里提到了这个帖子

Galaxy Nexus上的LED手电筒可通过什么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();
        } …

我正在编写一个Android相机应用程序,并试图实现Flash功能,我正在使用SurfaceView,每当我点击闪光按钮切换工作但闪光灯不会来...看到我以下的代码,我已经习惯打开/关闭手电筒.

完整代码: -

 @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_camera);

          preview=(SurfaceView)findViewById(R.id.surface);     
                previewHolder=preview.getHolder();    
                previewHolder.addCallback(surfaceCallback);    
                previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
                previewHolder.setFixedSize(getWindow().getWindowManager()     
                        .getDefaultDisplay().getWidth(), getWindow().getWindowManager() 
                        .getDefaultDisplay().getHeight()); 


            btnFlash = (ImageButton) findViewById(R.id.btnFlash);               
            /*
             * First check if device is supporting flashlight or not
             */
            hasFlash = getApplicationContext().getPackageManager()
                    .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

            if (!hasFlash) {
                // device doesn't support flash
                // Show alert message and close the application
                AlertDialog alert = new AlertDialog.Builder(CameraLauncherActivity.this)
                        .create();
                alert.setTitle("Error");
                alert.setMessage("Sorry, your device doesn't support flash light!");
                alert.setButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) { …