package wyf.ytl;
import java.io.IOException;//引入相关类
import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
public class Sample_2_12 extends Activity implements SurfaceHolder.Callback{
Camera myCamera;//Camera的引用
SurfaceView mySurfaceView;//SurfaceView的引用
SurfaceHolder mySurfaceHolder;//SurfaceHolder的引用
Button button1;//按钮的引用
Button button2;
boolean isPreview = false;//是否在浏览中
public void onCreate(Bundle savedInstanceState) {//重写的onCreate方法
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mySurfaceView = (SurfaceView) findViewById(R.id.surfaceView);//得到SurfaceView的引用
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);//得到两个按钮的应用
mySurfaceHolder = mySurfaceView.getHolder();//获得SurfaceHolder
mySurfaceHolder.addCallback(this);
mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
button1.setOnClickListener(new Button.OnClickListener(){//打开的按钮监听
public void onClick(View arg0) {
initCamera();
}
});
button2.setOnClickListener(new Button.OnClickListener(){//关闭的按钮监听
public void onClick(View arg0) {
if(myCamera != null && isPreview){//正在显示时
myCamera.stopPreview();
myCamera.release();
myCamera = null;
isPreview = false;
}
}
});
}
public void initCamera(){//初始化相机资源
if(!isPreview){
myCamera = Camera.open();
}
if(myCamera != null && !isPreview){
try {
myCamera.setPreviewDisplay(mySurfaceHolder);
myCamera.startPreview();//立即运行Preview
} catch (IOException e) {
e.printStackTrace();//打印错误信息
}
isPreview = true;
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
public void surfaceCreated(SurfaceHolder holder) {
}
public void surfaceDestroyed(SurfaceHolder holder) {
}
}
Sample_2_12.zip （24个子文件） 
Sample_2_12 bin 
classes.dex 4KB wyf ytl R$layout.class 361B R$id.class 418B R$drawable.class 367B R$attr.class 307B R.class 454B R$string.class 394B Sample_2_12$1.class 745B Sample_2_12$2.class 935B Sample_2_12.class 2KB resources.ap_ 11KB Sample_2_12.apk 14KB res drawable-ldpi 
icon.png 2KB Thumbs.db 4KB drawable-hdpi icon.png 4KB values strings.xml 173B drawable-mdpi icon.png 3KB layout main.xml 1KB assets default.properties 449B gen wyf ytl R.java 835B src wyf ytl Sample_2_12.java 2KB .project 847B .classpath 280B AndroidManifest.xml 750B
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