Car*_*us_ 8 android led flashlight
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();
}
}});
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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"/>
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有人可以帮忙吗?
亲切的问候,CarpeTemporem
Rah*_*med 17
我也遇到了同样的问题,但我试图从服务中打开LED,所以我无法使用1x1 SurfaceView.这就是我做的工作.
private void turnLEDOn() throws IOException
{
// In order to work, the camera needs a surface to turn on.
// Here I pass it a dummy Surface Texture to make it happy.
camera = Camera.open();
camera.setPreviewTexture(new SurfaceTexture(0));
camera.startPreview();
Parameters p = camera.getParameters();
p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
}
private void turnLEDOff()
{
if (camera != null)
{
// Stopping the camera is enough to turn off the LED
camera.stopPreview();
camera.release();
camera = null;
} else
throw new NullPointerException("Camera doesn't exist to turn off.");
}
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SurfaceTexture在API Level 11(Android 3.0)中添加,因此它只适用于Honeycomb或更新版本.对于较旧的API级别,您可以在另一个答案中坚持使用SurfaceView技巧.
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