Android多媒体之相机Camera

<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"
tools:context="${relativePackage}.${activityClass}" >

<Button
android:id="@+id/take_b"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="点击拍照" />

<SurfaceView
android:id="@+id/surfaceView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_below="@+id/take_b" />

<ImageView
android:id="@+id/img"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_alignParentBottom="true"
android:background="#0000FF"/>

</RelativeLayout>

package com.zhidi.stucamera;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity implements OnClickListener{
private Button take_b;
private ImageView img;
private SurfaceView surface;
private Camera camera;
private String fname;
private SurfaceHolder holder;
private final String SDCARD_HOME = Environment.getExternalStorageDirectory()+File.separator;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

init();
initEvent();
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.take_b:
camera.takePicture(null, null, new PictureCallback() {

@Override
public void onPictureTaken(byte[] data, Camera camera) {
new MyAsyncTask().execute(data);
camera.startPreview();
}
});
break;

default:
break;
}
}

class MyCallback implements Callback{

@Override
public void surfaceCreated(SurfaceHolder holder) {
//打开摄像头
camera = Camera.open();
//设置摄像头预览角度
camera.setDisplayOrientation(90);
try {
//设置摄像头预览显示器
camera.setPreviewDisplay(holder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//开始预览
camera.startPreview();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
//获得摄像头参数
Parameters p = camera.getParameters();
//设置摄像头参数
camera.setParameters(p);
//开始预览
camera.startPreview();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
//释放摄像头
camera.release();
camera = null;
}

}

//自定义异步保存图片类
class MyAsyncTask extends AsyncTask<byte[], String, String>{

@Override
protected String doInBackground(byte[]... params) {
byte[] param = params[0];
fname = SDCARD_HOME+"IMG"+System.currentTimeMillis()+".jpg";
File file = new File(fname);
try {
FileOutputStream out = new FileOutputStream(file);
out.write(param);
out.flush();
out.close();
return "OK";
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}

@Override
protected void onPostExecute(String result) {
Drawable drawable = Drawable.createFromPath(fname);
img.setImageDrawable(drawable);
super.onPostExecute(result);
}
}

private void init(){
take_b = (Button) findViewById(R.id.take_b);
img = (ImageView) findViewById(R.id.img);
surface = (SurfaceView) findViewById(R.id.surfaceView1);
holder = surface.getHolder();
}

private void initEvent(){
take_b.setOnClickListener(this);
holder.addCallback(new MyCallback());
}
}

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

<!-- 调用摄像头功能 -->
<uses-feature android:name="android.hardware.camera" />
<!-- 调用自动对焦功能 -->
<uses-feature android:name="android.hardware.camera.autofocus" />
<!-- 设置允许拍照的权限-->
<uses-permission android:name="android.permission.CAMERA" />
<!-- SD卡创建与删除文件权限-->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<!-- 配置SD卡权限-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="20" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".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>