我正在使用折旧的Camera API。我的目标是每分钟拍一张照片10分钟,所以我有一个倒数计时器调用我的图像捕获。第一次图像捕捉在100%的时间内都能很好地工作。随后的照片在不同程度上失焦。有什么想法吗?在调用下一个图像捕获之前很久就会捕获并写入照片,所以我不相信它发生得太快。
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_apicTimer);
imageView = (ImageView) findViewById(R.id.ViewImg);
SurfaceView surfaceView;
surfaceView = (SurfaceView) findViewById(R.id.SurfaceView);
surfaceView.setEnabled(false);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
//Calls the timer
picLoop();
}
public void picLoop(){
timer = new CountDownTimer(totalTime,60000){ //(time in ms, tick length)
public void onFinish(){
}
public void onTick(long millisUntilFinished){
captureImage();
}
}.start();
public void captureImage() {
//Need to wait a sec for the surface to form before we ask for autofocus
new CountDownTimer(3000,500){ //1000 ms, 500ms tick
public void onFinish(){
camera.autoFocus(autoFocusCB);
}
public void onTick(long millisUntilFinished){
}}.start();
//When autofocused, take the picture
autoFocusCB = new android.hardware.Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, android.hardware.Camera camera) {
camera.takePicture(null, null, jpegCallback);
}
};
//When the picture exists, save and display
jpegCallback = new android.hardware.Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, android.hardware.Camera camera) {
picData = data;
displayPic(data); //call to a function to display to an imageview
}
};
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try{
camera = android.hardware.Camera.open();
}
catch (RuntimeException e){
System.err.println(e);
return;
}
List<Camera.Size> picSizes;
android.hardware.Camera.Size largestSize;
android.hardware.Camera.Parameters param;
param = camera.getParameters();
param.setPreviewSize(352, 288);
param.setFlashMode(FLASH_MODE_AUTO);
//param.setFocusMode(FOCUS_MODE_AUTO);
param.setFocusMode(FOCUS_MODE_CONTINUOUS_PICTURE);
param.setPictureSize(1952,1952);
param.setJpegQuality(100);
param.setExposureCompensation(param.getMinExposureCompensation());
param.setWhiteBalance(WHITE_BALANCE_AUTO);
camera.setParameters(param);
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
}
catch (Exception e) {
System.err.println(e);
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
refreshCamera();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera = null;
}
private void refreshCamera() {
if (surfaceHolder.getSurface() == null) {
return;
}
try {
camera.stopPreview();
}
catch (Exception e) {
System.err.println(e);
return;
}
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
}
catch (Exception e) {
}
}
}
答案 0 :(得分:1)
我最终不得不关闭相机并在每次捕捉之间完全重新打开它。
所以,每次捕获后都会这样:
camera.stopPreview();
camera.release();
camera = null;
然后,在每次捕获之前:
try{
camera = android.hardware.Camera.open();
}
catch (RuntimeException e){
System.err.println(e);
return;
}
List<Camera.Size> picSizes;
android.hardware.Camera.Size largestSize;
android.hardware.Camera.Parameters param;
param = camera.getParameters();
param.setPreviewSize(352, 288);
param.setFlashMode(FLASH_MODE_AUTO);
param.setFocusMode(FOCUS_MODE_AUTO);
param.setPictureSize(1952,1952);
param.setJpegQuality(100);
param.setExposureCompensation(param.getMinExposureCompensation());
param.setWhiteBalance(WHITE_BALANCE_AUTO);
camera.setParameters(param);
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
}
catch (Exception e) {
System.err.println(e);
}