Android学习05Camera图像采集-优快云博客

本文链接：https://blog.youkuaiyun.com/kbest/article/details/6339350

本文介绍了一个简单的Android相机应用程序开发过程，包括如何申请相机权限、设置布局以显示预览画面及控制相机开关的方法。

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用Camera则必须要获得他的权限，新建一个项目打开AndroidManifest.xml文件在</mainfest>前面加上

<uses-permission android:name="android.permission.CAMERA"/>即可

给屏幕添加布局，修改main.xml文件

修改后的结果如下图：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<SurfaceView
     android:id = "@+id/surfaceView"
     android:layout_width="480px"
     android:layout_height="320px"
    />
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

    <Button
      android:id = "@+id/button1"
      android:layout_width = "wrap_content"
      android:layout_height = "wrap_content"
      android:text = "打开"
    />

        <Button
      android:id = "@+id/button2"
      android:layout_width = "wrap_content"
      android:layout_height = "wrap_content"
      android:text = "关闭"
    />
    </LinearLayout>
</LinearLayout>

Activity类代码如下：

package karant.zhan;

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 CameraTest extends Activity implements SurfaceHolder.Callback{

Camera myCamera;   //Camera对象的引用
SurfaceView mySurfaceView;   //SurfaceView对象的引用
SurfaceHolder mySurfaceHolder; //SurfaceHolder对象的引用
Button button1;
Button button2;
boolean isPreview = false;    //是否在浏览中

@Override
    public void onCreate(Bundle savedInstanceState) {
        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);

        mySurfaceHolder = mySurfaceView.getHolder(); //获得SurfaceHolder
        mySurfaceHolder.addCallback(this);
        mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        button1.setOnClickListener(new Button.OnClickListener()   //打开按钮监听
        {
        public void onClick(View v){   //单击事件
          initCamera();    //调用初始化方法
        }

        }
        );

        button2.setOnClickListener( new Button.OnClickListener() //关闭按钮监听
        {
        public void onClick(View v){   //正在显示时
          if(myCamera != null&& isPreview){
           myCamera.stopPreview();
           myCamera.release();
           myCamera = null;
           isPreview = false; //设成false
          }
        }

}
);
}

public void initCamera(){
    if(!isPreview){      //打开Camera
      myCamera = Camera.open();
    }
    if(myCamera != null && !isPreview){
      try {
    myCamera.setPreviewDisplay(mySurfaceHolder);
    myCamera.startPreview(); //立即运行
   } catch (Exception e) {
    e.printStackTrace();
   }
   isPreview = true;
    }

    }







@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
  // TODO Auto-generated method stub

}