android 摄像头开发相关源代码

package com.example; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.List; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.PixelFormat; import android.hardware.Camera; import android.hardware.Camera.Parameters; import android.hardware.Camera.PreviewCallback; import android.hardware.Camera.Size; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; class Preview extends SurfaceView implements SurfaceHolder.Callback { private static final String TAG = "Preview"; SurfaceHolder mHolder; public Camera camera; IGetFrameData getFrameData; int w=240; int h=320; Preview(Context context,IGetFrameData iGetFrameData) { super(context); getFrameData=iGetFrameData; // 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. Log.d(TAG,"surfaceCreated"); camera = Camera.open(); try { camera.setPreviewDisplay(holder); camera.setPreviewCallback(new PreviewCallback() { public void onPreviewFrame(byte[] data, Camera arg1) { FileOutputStream outStream = null; getFrameData.OnGetFrame(data, w, h); Preview.this.invalidate(); } }); } catch (IOException e) { e.printStackTrace(); } } 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. Log.d(TAG,"surfaceDestroyed"); camera.stopPreview(); camera.release();//加上这句，就OK！ camera = null; } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // Now that the size is known, set up the camera parameters and begin // the preview. Log.d(TAG,"surfaceChanged"); Camera.Parameters parameters = camera.getParameters(); parameters.setPreviewSize(w, h); // parameters.set("orientation", "portrait"); // parameters.setRotation(90); parameters.set("camera-id",2); camera.setParameters(parameters); camera.startPreview(); parameters = camera.getParameters(); List<Size> allSize= parameters.getSupportedPreviewSizes(); for(int i=0;i<allSize.size();i++) { Size cuSize=allSize.get(i); Log.d(TAG,"support w is "+cuSize.width+" h is "+cuSize.height); } Size preSize= parameters.getPreviewSize(); w=preSize.width; h=preSize.height; Log.d(TAG,"w is "+Integer.toString(w)+" h is "+Integer.toString(h)); } @Override public void draw(Canvas canvas) { super.draw(canvas); Paint p= new Paint(Color.RED); Log.d(TAG,"draw"); canvas.drawText("PREVIEW", canvas.getWidth()/2, canvas.getHeight()/2, p ); } }