這是我第一次在Android上編程,更多的我不是那麼熟悉java的programmation。我試圖通過互聯網找到我的問題的答案,但沒有找到任何解決方案。我希望你們中的一個能夠幫助我。 我想要做的是實時應用一些圖像處理到攝像機並顯示它。這就是爲什麼我使用onPreviewFrame函數在顯示結果之前進行一些圖像處理的原因。請告訴我,如果這不是最好的方法。我的問題是,當我嘗試修改數據數組時,屏幕上沒有任何更改。從我看到的調試器中調用該函數。所有這些都是用2.1 API完成的。onPreviewFrame不會改變數據
有人知道爲什麼嗎?我該如何解決這個問題?
幫助,這裏是我的代碼:
import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import java.io.IOException;
// ----------------------------------------------------------------------
public class CameraPreview extends Activity {
private Preview mPreview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide the window title.
requestWindowFeature(Window.FEATURE_NO_TITLE);
// Create our Preview view and set it as the content of our activity.
mPreview = new Preview(this);
setContentView(mPreview);
}
}
// ----------------------------------------------------------------------
class Preview extends SurfaceView implements SurfaceHolder.Callback, Camera.PreviewCallback {
SurfaceHolder mHolder;
Camera mCamera;
Preview(Context context) {
super(context);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(holder);
mCamera.setPreviewCallback(this);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void onPreviewFrame(byte[] data, Camera camera) {
if (data != null) {
for(int i=0;i<data.length;i++){
data[i] = 0;
}
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(w, h);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
謝謝你的幫助, 摩根科米爾