点击捕获按钮后,我需要定期拍摄图像。我使用Handler编写了代码。但现在发生的是,我需要在每次捕获图像时单击按钮。我想要的只是单击按钮一次然后处理自动化。这是定期捕获图像而无需进一步点击。我怎样才能做到这一点。谢谢。
public class MyCamera extends Activity {
private Camera mCamera;
private CameraPreview mCameraPreview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mCamera = getCameraInstance();
mCameraPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mCameraPreview);
Button captureButton = (Button) findViewById(R.id.button_capture);
captureButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCamera.takePicture(null, null, mPicture);
}
});
final Handler handler = new Handler();
final Runnable r = new Runnable()
{
public void run()
{
mCamera.takePicture(null,null,mPicture);
}
};
handler.postDelayed(r, 15000);
}
private Camera getCameraInstance() {
Camera camera = null;
try {
camera = Camera.open();
} catch (Exception e) {
// cannot get camera or does not exist
}
return camera;
}
PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFile = getOutputMediaFile();
if (pictureFile == null) {
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
Log.d(TAG, e.getMessage());
} catch (IOException e) {
Log.d(TAG, e.getMessage());
}
}
};
}
答案 0 :(得分:0)
尝试使你的处理程序和runnable全局,然后设置setOnclickListener() handler.postDelayed(r,15000);
答案 1 :(得分:0)
在你的onclick听众中,
handler.removeCallbacks(runnable);
handler.postDelayed(runnable,15000);
在onclick侦听器之外声明你的处理程序并像这样运行,
Handler handler=new Handler();
Runnable runnable=new Runnable() {
@Override
public void run() {
mCamera.takePicture(null, null, mPicture);
handler.postDelayed(this, 15000);
}
};
<强>说明强>
当您单击相机按钮时,将附加一个处理程序,它将在15分钟后拍摄照片并将相同的runnable附加到处理程序以重复执行任务。如果用户再次点击相机按钮,我有用户handler.removeCallbacks(runnable);
以避免多个处理程序。可能你可以自己删除onCickListener。此外,当您的活动/相机不可用时,您应该致电handler.removeCallbacks(runnable);
。