surfaceview-如何使用-有什么中文资料面包板社区

問題1：如何將camera surfaceview 顯示在最上層：用了this.setZOrderOnTop(true);這個方法問題2：如何用一個BUTTON來自由控制camera 可以出現預覽效果或者取消預覽效果，但是仍然能得到camera 回調數據方法是： lleftLayout.removeView(cameraPreview); cameraPreview.setZOrderOnTop(true/false);///這個方法將當前的camera surface 帶到最上層 lleftLayout.addView(cameraPreview); 問題3：如果出現以下異常： 04-09 12:51:30.475: E/AndroidRuntime(3980): FATAL EXCEPTION: main 04-09 12:51:30.475: E/AndroidRuntime(3980): java.lang.RuntimeException: Method called after release() 04-09 12:51:30.475: E/AndroidRuntime(3980): at android.hardware.Camera.setHasPreviewCallback(Native Method) 04-09 12:51:30.475: E/AndroidRuntime(3980): at android.hardware.Camera.access$600(Camera.java:120) 04-09 12:51:30.475: E/AndroidRuntime(3980): at android.hardware.Camera$EventHandler.handleMessage(Camera.java:617) 主要引起是因為在 camera.stopPreview(); camera.release(); 前沒有將setPreviewCallback 設置為null, 解決情況: public void surfaceDestroyed(SurfaceHolder holder) { camera.setPreviewCallback(null) ; camera.stopPreview(); camera.release(); camera = null; Log.e("CameraPreview", "sufaceDestroyed---------camera release"); } //////////////////////////////////////////////////////////////////////////////////////////// 直接上原碼： package com.test.surfaceview; import java.io.IOException; import java.util.List; import android.content.Context; import android.hardware.Camera; import android.hardware.Camera.PreviewCallback; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback ,PreviewCallback{ SurfaceHolder mHolder; private Camera camera; public CameraPreview(Context context) { super(context); mHolder = getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { camera = Camera.open(); camera.setPreviewCallback(this); try { camera.setPreviewDisplay(holder); } catch (IOException exception) { camera.release(); camera = null; } } public void surfaceDestroyed(SurfaceHolder holder) { camera.setPreviewCallback(null) ; camera.stopPreview(); camera.release(); camera = null; Log.e("CameraPreview", "sufaceDestroyed---------camera release"); } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { Camera.Parameters parameters = camera.getParameters(); ListCamera.Size lSize = parameters.getSupportedPreviewSizes(); Log.i("size", "width="+lSize.get(0).width+",height="+lSize.get(0).height); // parameters.setPreviewSize(200, 200); camera.setParameters(parameters); camera.startPreview(); } @Override public void onPreviewFrame(byte[] arg0, Camera arg1) { // TODO Auto-generated method stub Log.d("CameraPreview","-------onPreviewFrame------"); } } -------------------------------------------------------- package com.test.surfaceview; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; public class OtherSurfaceView extends SurfaceView { Canvas canvas; private SurfaceHolder mHolderControl=null; public OtherSurfaceView(Context context) { super(context); mHolderControl=this.getHolder(); mHolderControl.addCallback(new SurfaceHolder.Callback(){ @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub draw(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub }}); // TODO Auto-generated constructor stub } private void draw(){ Log.d("TAG", "---------------"); canvas=mHolderControl.lockCanvas(); if(mHolderControl == null || canvas == null){ return; } ---------------------------------------------------------------------- package com.test.surfaceview; import android.app.Activity; import android.os.Bundle; import android.widget.FrameLayout; import android.widget.FrameLayout.LayoutParams; import android.widget.LinearLayout; public class TestMultiSurfaceviewActivity extends Activity { /** Called when the activity is first created. */ private Button btSwitchBlue=null; private boolean bShowCamera = true; private LinearLayout lleftLayout; private CameraPreview cameraPreview; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // setContentView(R.layout.main); FrameLayout lLayout =new FrameLayout(this); // LayoutParams lp = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT); // // lLayout.setLayoutParams(lp); this.addContentView(lLayout,new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT)); lleftLayout =new LinearLayout(this); LinearLayout.LayoutParams lpCamera = new LinearLayout.LayoutParams(300,400); // lpCamera.weight = 1; lleftLayout.setLayoutParams(lpCamera); lLayout.addView(lleftLayout); cameraPreview = new CameraPreview(this); cameraPreview.setZOrderOnTop(true); lleftLayout.addView(cameraPreview); lLayout.bringChildToFront(lleftLayout); LinearLayout lrightLayout =new LinearLayout(this); LinearLayout.LayoutParams lpOther = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT); // lpOther.weight = 1; lLayout.addView(lrightLayout); OtherSurfaceView otherSurfaceView = new OtherSurfaceView(this); otherSurfaceView.setLayoutParams(lpOther); lrightLayout.addView(otherSurfaceView); //btSwitchBlue.findViewById(R.id.show); btSwitchBlue = new Button(this); btSwitchBlue.setText("hide"); FrameLayout.LayoutParams lpbutton = new FrameLayout.LayoutParams(120,80); lpbutton.gravity = Gravity.BOTTOM | Gravity.RIGHT; btSwitchBlue.setLayoutParams(lpbutton); btSwitchBlue.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { if (!bShowCamera) { lleftLayout.removeViewInLayout(cameraPreview); cameraPreview = new CameraPreview(TestMultiSurfaceviewActivity.this); cameraPreview.setZOrderOnTop(true); /*lrightLayout.removeView(otherSurfaceView); cameraPreview.setZOrderOnTop(true); lrightLayout.addView(otherSurfaceView);*/ bShowCamera = true; lleftLayout.addView(cameraPreview); // camera.startPrevie(); //lLayout.bringChildToFront(lrightLayout); btSwitchBlue.setText("hide"); } else if(bShowCamera){ lleftLayout.removeViewInLayout(cameraPreview); cameraPreview = new CameraPreview(TestMultiSurfaceviewActivity.this); cameraPreview.setZOrderOnTop(false); lleftLayout.addView(cameraPreview); bShowCamera = false; btSwitchBlue.setText("show"); } }}); //btSwitchBlue.setBackgroundColor(Color.RED); lLayout.addView(btSwitchBlue); } }

标签: surfaceview