相机camera，出错，error camera error 100

mainactivity.java
package com.example.shootyou;

import java.io.IOException;

import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.Su易做图ceHolder;
import android.view.Su易做图ceView;
import android.view.Window;

public class MainActivity extends Activity {
     private Camera camera;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
Su易做图ceView sv=(Su易做图ceView)findViewById(R.id.su易做图ce1);
final Su易做图ceHolder sh=sv.getHolder();
sh.setType(Su易做图ceHolder.SURFACE_TYPE_PUSH_BUFFERS);
camera=Camera.open();
try {camera.setPreviewDisplay(sh);
        /* Camera.Parameters parameters=camera.getParameters();*/
         camera.startPreview();
         camera.autoFocus(null);
}catch(IOException e){
e.printStackTrace();
}
}
@Override
protected void onPause() {
// TODO 自动生成的方法存根
camera.stopPreview();
camera.release();
super.onPause();
}

}
manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.shootyou"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-feature android:name="android.hardware.camera"/>
    <uses-feature android:name="android.hardware.camera.autofocus"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.shootyou.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
布局文件
<FrameLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
<Su易做图ceView
    android:id="@+id/su易做图ce1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>
<ImageView
    android:id="@+id/gun1"
    android:contentDescription="@string/gun"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/gun"
    android:layout_gravity="bottom|center_vertical"/>
</FrameLayout>
运行后提示错误
10-14 13:47:45.598: E/Camera(1615): Error 100
10-14 13:54:53.738: I/Choreographer(1615): Skipped 47 frames!  The application may be doing too much work on its main thread.
看问题的意思好像说是相机的帧数太多，相对主进程太大，不知道局地问题是哪里，请指教，我只是想获取摄像头预览，并不需要照相，存取相片，因此就没有对内存卡权限声明，应该不会影响吧摄像头内存 Camera --------------------编程问答-------------------- http://stackoverflow.com/questions/8647628/android-camera-server-died-and-camera-error-100/9929683照这个改一下试试。
Skipped 47 frames!是说有47条log没抓到，原因可能是UI主线程干的活太多了，建议把耗时操作放到新线程里。

补充：移动开发 ,  Android