Android摄像头活动类 - 实现SurfaceView - 问题

Question

我想创建使用SurfaceView类的摄像头活动类但它给了我错误。

这是我的错误日志猫

08-28 12:21:11.558: E/AndroidRuntime(989): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.cameraapp/com.example.cameraapp.CameraSurfaceView}: java.lang.InstantiationException: com.example.cameraapp.CameraSurfaceView 
08-28 12:21:11.558: E/AndroidRuntime(989): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569) 
08-28 12:21:11.558: E/AndroidRuntime(989): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
08-28 12:21:11.558: E/AndroidRuntime(989): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
08-28 12:21:11.558: E/AndroidRuntime(989): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
08-28 12:21:11.558: E/AndroidRuntime(989): at android.os.Handler.dispatchMessage(Handler.java:99) 
08-28 12:21:11.558: E/AndroidRuntime(989): at android.os.Looper.loop(Looper.java:123) 
08-28 12:21:11.558: E/AndroidRuntime(989): at android.app.ActivityThread.main(ActivityThread.java:3683) 
08-28 12:21:11.558: E/AndroidRuntime(989): at java.lang.reflect.Method.invokeNative(Native Method) 
08-28 12:21:11.558: E/AndroidRuntime(989): at java.lang.reflect.Method.invoke(Method.java:507) 
08-28 12:21:11.558: E/AndroidRuntime(989): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
08-28 12:21:11.558: E/AndroidRuntime(989): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
08-28 12:21:11.558: E/AndroidRuntime(989): at dalvik.system.NativeStart.main(Native Method) 
08-28 12:21:11.558: E/AndroidRuntime(989): Caused by: java.lang.InstantiationException: com.example.cameraapp.CameraSurfaceView 
08-28 12:21:11.558: E/AndroidRuntime(989): at java.lang.Class.newInstanceImpl(Native Method) 
08-28 12:21:11.558: E/AndroidRuntime(989): at java.lang.Class.newInstance(Class.java:1409) 
08-28 12:21:11.558: E/AndroidRuntime(989): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
08-28 12:21:11.558: E/AndroidRuntime(989): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561) 
08-28 12:21:11.558: E/AndroidRuntime(989): ... 11 more 

这是我CameraSurfaceActivity：

package com.example.cameraapp; 

import java.io.IOException; 

import android.content.Context; 
import android.view.SurfaceView; 
import android.view.SurfaceHolder; 
import android.hardware.Camera; 

public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback 
{ 
     private SurfaceHolder holder; 
     private Camera camera; 

     public CameraSurfaceView(Context context) 
     { 
       super(context); 

       //Initiate the Surface Holder properly 
       this.holder = this.getHolder(); 
       this.holder.addCallback(this); 
       this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
     } 

     public void surfaceCreated(SurfaceHolder holder) 
     { 
       try 
       { 
         //Open the Camera in preview mode 
         this.camera = Camera.open(); 
         this.camera.setPreviewDisplay(this.holder); 
       } 
       catch(IOException ioe) 
       { 
         ioe.printStackTrace(System.out); 
       } 
     } 

     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. 
       Camera.Parameters parameters = camera.getParameters(); 
       parameters.setPreviewSize(width, height); 
       camera.setParameters(parameters); 
       camera.startPreview(); 
     } 



     public void surfaceDestroyed(SurfaceHolder holder) 
     { 
       // Surface will be destroyed when replaced with a new screen 
       //Always make sure to release the Camera instance 
       camera.stopPreview(); 
       camera.release(); 
       camera = null; 
     } 

     public Camera getCamera() 
     { 
       return this.camera; 
     } 
} 

清单中，我已经定义的权限，以及，

android:targetSdkVersion="15" /> 
    <uses-feature android:name="android.hardware.camera" /> 
<uses-permission android:name="android.permission.CAMERA" /> 

现在，请指导我为可能的解决方案

01在 camera.setParameters(width, height);发生

感谢

Shumaila

Answer 1

错误。

退房这个话题：Camera crashes in Android 2.2

需要得到最佳的相机尺寸后设置相机的预览大小。下面是详细信息和代码修复 - http://code.google.com/p/android/issues/detail?id=7909