Android 开启闪光灯做手电筒 源码

权限：
    <uses-permission android:name="android.permission.FLASHLIGHT" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.CAMERA" />
　　　<uses-feature android:name="android.hardware.camera" />
　　　
布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
    android:orientation="vertical" >

    <ToggleButton
        android:id="@+id/toggleButton1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:checked="true"
        android:text="ToggleButton" />

</LinearLayout>

源码
package cn.lee.handlight;

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;

public class HandLightActivity 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.main);

		toggleButton = (ToggleButton) this.findViewById(R.id.toggleButton1);
		toggleButton.setOnClickListener(this);
		
		getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
		//保持屏幕
	}

	@Override
	public void onClick(View v) {
		ToggleButton tb = (ToggleButton) v;
		Camera.Parameters param = camera.getParameters();
		if(!tb.isChecked()){
			param.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
			toggleButton.setBackgroundColor(0x30ffffff);
		}else{
			param.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
			toggleButton.setBackgroundColor(0xffffffff);
		}
		camera.setParameters(param);
	}

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