Android开发----------- 手电筒改进版本号

在之前的基础上

在 res 目录以下： 加入一个 drawable/local_me.xml

localme_cml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true"
        android:drawable="@drawable/on" /> <!-- pressed -->
    <item android:drawable="@drawable/off" /> <!-- default/unchecked -->
</selector>

主程序：

package com.example.handlightactivity;

import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.os.Process;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.ToggleButton;  

/**
 *
 * @author love
 *
 * 原理：
 * 就是通过 点击button，
 *   当 点击button的时候   打开闪光灯。
 *   关闭 button的时候    关闭闪光灯
 *
 *
 * */

public class MainActivity extends Activity implements OnClickListener {  

    private ToggleButton toggleButton;  

    private Camera camera = Camera.open();
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);  

        toggleButton = (ToggleButton) this.findViewById(R.id.toggleButton1);
        toggleButton.setOnClickListener(this);  

        //保持屏幕
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    }  

    @Override
    public void onClick(View v) {
        ToggleButton tb = (ToggleButton) v;
        Camera.Parameters param = camera.getParameters();
        if(!tb.isChecked()){
//        	open the  camera flash!
            param.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
            toggleButton.setBackgroundColor(0x30ffffff);
//          on open on.jpg
            tb.setBackgroundDrawable(getResources().getDrawable(R.drawable.on));
        }else{
            param.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
            toggleButton.setBackgroundColor(0xffffffff);
//           off  open the off.jpg
            tb.setBackgroundDrawable(getResources().getDrawable(R.drawable.off));
        }
        camera.setParameters(param);
    }  

    @Override
    protected void onPause() {
//      camera.release();
//      Process.killProcess(Process.myPid());
        super.onPause();
    }
}

效果图：