我想把camera显示到PopupWindow但是怎么都不行?请大侠帮忙看看十分感谢!一下是我的代码
AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.wanghai.camerapreview"
    android:versionCode="1"
    android:versionName="1.0" >    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    
    <!-- 授予程序使用摄像头的权限 -->
<uses-permission android:name="android.permission.CAMERA" /> 
<uses-feature android:name="android.hardware.camera" /> 
<uses-feature android:name="android.hardware.camera.autofocus" />    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:screenOrientation="landscape"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application></manifest>
MainActivity.java
package org.wanghai.camerapreview;
import android.hardware.Camera;
import android.os.Bundle;
import android.app.Activity;
import android.app.Dialog;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.FrameLayout;
import android.widget.PopupWindow;public class MainActivity extends Activity {
private Camera mCamera;
    private CameraPreview mPreview;
    private View viewDia;
    private PopupWindow pw;
    private FrameLayout preview;
    @Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);
mCamera = getCameraInstance();
findViewById(R.id.start_popu).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
viewDia = LayoutInflater.from(MainActivity.this).inflate(
R.layout.pupo_main, null);
pw = new PopupWindow(MainActivity.this);
pw.setWidth(LayoutParams.MATCH_PARENT);
pw.setHeight(440);
pw.setContentView(viewDia);
pw.showAtLocation(findViewById(R.id.main), Gravity.TOP, 0, 0);

        mPreview = new CameraPreview(MainActivity.this, mCamera);
preview = (FrameLayout)viewDia.findViewById(R.id.camera_preview);
preview.addView(mPreview);

}
});

}
    
   
    public static Camera getCameraInstance(){
        Camera c = null;
        try {
            c = Camera.open();
            System.out.println(c);// attempt to get a Camera instance
            System.out.println("camera open ok !");
        }
        catch (Exception e){
            // Camera is not available (in use or does not exist)
        }
        return c; // returns null if camera is unavailable
    }
}CameraPreview.java
package org.wanghai.camerapreview;import java.io.IOException;import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
    static final String TAG =  "CameraPreview";
private SurfaceHolder mHolder;
    private Camera mCamera;    public CameraPreview(Context context, Camera camera) {
        super(context);
        System.out.println("CameraPreview "+camera);
        mCamera = camera;        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
        // deprecated setting, but required on Android versions prior to 3.0
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, now tell the camera where to draw the preview.
        try {
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();
        } catch (IOException e) {
            Log.d(TAG, "Error setting camera preview: " + e.getMessage());
        }
    }    public void surfaceDestroyed(SurfaceHolder holder) {
        // empty. Take care of releasing the Camera preview in your activity.
     try {
            mCamera.stopPreview();
            mCamera.release();
            mCamera = null;
        } catch (Exception e){
          // ignore: tried to stop a non-existent preview
        }
    }    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // If your preview can change or rotate, take care of those events here.
        // Make sure to stop the preview before resizing or reformatting it.        if (mHolder.getSurface() == null){
          // preview surface does not exist
          return;
        }        // stop preview before making changes
        try {
            mCamera.stopPreview();
        } catch (Exception e){
          // ignore: tried to stop a non-existent preview
        }        // set preview size and make any resize, rotate or
        // reformatting changes here        // start preview with new settings
        try {
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();        } catch (Exception e){
            Log.d(TAG, "Error starting camera preview: " + e.getMessage());
        }
    }
}
布局文件:
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:id="@+id/main">
<Button
android:id="@+id/start_popu"
android:layout_width="wrap_content" 
android:layout_height="wrap_content"
android:text="startpupo"
/></RelativeLayout>pupo_main.xml<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
      <FrameLayout
          android:id="@+id/camera_preview"
          android:layout_width="352dp"
          android:layout_height="288dp"
          android:layout_weight="1" />
</RelativeLayout>哪位大侠帮忙看看!谢谢了!