[英]Android camera fails taking a picture every second
首先讓我說,如果圖像拍攝間隔超過 1 秒,它就可以工作。 例如,每 2 秒拍一張照片效果很好。 但是每秒拍照有時會拋出java.lang.RuntimeException: takePicture failed
。 什么可能導致這種行為?
這是我使用的代碼,它在Service 中:
@Override
public void onCreate()
{
super.onCreate();
prefs = getSharedPreferences("general",Context.MODE_PRIVATE);
handler = new Handler();
shotInterval = prefs.getInt(getString(R.string.prefs_int_imageShootingFrequency),1);
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
Toast.makeText(this, "No camera on this device", Toast.LENGTH_LONG).show();
} else {
cameraId = findBackFacingCamera();
if (cameraId < 0) {
Toast.makeText(this, "No front facing camera found.",Toast.LENGTH_LONG).show();
} else {
camera = Camera.open(cameraId);
}
}
cameraParameters = camera.getParameters();
cameraParameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE); //set camera to continuously auto-focus
camera.setParameters(cameraParameters);
pictureTaker.run(); // Start looping
}
Runnable pictureTaker = new Runnable() {
@Override
public void run() {
try {
takePicture();
} finally {
// 100% guarantee that this always happens, even if
// your update method throws an exception
handler.postDelayed(pictureTaker, shotInterval*1000);
}
}
};
private void takePicture(){
SurfaceView view = new SurfaceView(this);
try {
camera.setPreviewDisplay(view.getHolder());
camera.startPreview();
camera.takePicture(null, null,new PhotoHandler(getApplicationContext()));
} catch (IOException e) {
e.printStackTrace();
}
}
您應該從onPictureTaken()
回調中啟動postDelayed()
。 您可以在調用takePicture()
檢查系統計時器並分別減少延遲,以保持 1000 毫秒的重復,但可能偶爾,此延遲會達到 0。
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