主要实现两个步骤：

1、实现打开和关闭闪光灯；而实现操作闪光灯主要通过Camera类

Camera camera = Camera.open();

Parameters mParameters = camera.getParameters();

mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);//打开Camera.Parameters.FLASH_MODE_OFF则为关闭

camera.setParameters(mParameters)

2、自定义闪光灯的按钮；自定义控件主要是设置设置view的大小

onMeasure(int widthMeasureSpec, int heightMeasureSpec)这个方法介绍 http://blog.csdn.net/x605940745/article/details/17583609

效果如下：

源码如下：

package com.android.xiong.xionglight;

import android.app.Activity;

import android.os.Bundle;

import android.view.KeyEvent;

import android.view.Menu;

public class MainActivity extends Activity {

private LightBkView light1;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

light1 = (LightBkView) findViewById(R.id.light1);

//定义单击事件

light1.setOnClickListener(light1);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}

package com.android.xiong.xionglight;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.hardware.Camera;

import android.hardware.Camera.Parameters;

import android.util.AttributeSet;

import android.view.View;

import android.view.View.OnClickListener;

public class LightBkView extends View implements OnClickListener {

Camera camera = Camera.open();

// 定义画皮

Paint paint = new Paint();

Paint paint1 = new Paint();

int x = 0;

int y = 0;

// 打开闪光灯

boolean islight;

public LightBkView(Context context, AttributeSet set) {

super(context, set);

}

@Override

protected void onDraw(Canvas canvas) {

// 获取控件的宽度和高度

int width = this.getWidth();

int heigth = this.getHeight();

// 圆点的坐标

x = width / 2;

y = heigth / 2;

//更换开关背景

if(!islight){

paint.setColor(Color.BLUE);

canvas.drawCircle(x, y, 60, paint);

paint1.setColor(Color.RED);

paint1.setTextSize(20);

canvas.drawText("打开闪光灯", x-50, y, paint1);

invalidate();

}else{

paint.setColor(Color.WHITE);

canvas.drawCircle(x, y, 60, paint);

paint1.setColor(Color.RED);

paint1.setTextSize(20);

canvas.drawText("关闭闪光灯", x-50, y, paint1);

invalidate();

}

}

// 定义View的大小

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

setMeasuredDimension(getWidth(widthMeasureSpec),

getHeight(heightMeasureSpec));

}

//定义view的宽度

public int getWidth(int widthMeasureSpec) {

int reslut = 0;

int widthMode = MeasureSpec.getMode(widthMeasureSpec);

if (widthMode == MeasureSpec.AT_MOST) {

reslut = 120;

}

if (widthMode == MeasureSpec.EXACTLY) {

reslut = MeasureSpec.getSize(widthMeasureSpec);

}

return reslut;

}

//定义view的高度

public int getHeight(int heightMeasureSpec) {

int reslut = 0;

int heightMode = MeasureSpec.getMode(heightMeasureSpec);

if (heightMode == MeasureSpec.AT_MOST) {

reslut = 120;

}

if (heightMode == MeasureSpec.EXACTLY) {

reslut = MeasureSpec.getSize(heightMeasureSpec);

}

return reslut;

}

// 实现闪光灯的的开关

@Override

public void onClick(View v) {

if (!islight) {

Parameters mParameters = camera.getParameters();

mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);

camera.setParameters(mParameters);

islight = true;

} else {

Parameters mParameters = camera.getParameters();

mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);

camera.setParameters(mParameters);

islight = false;

}

}

}转载请注明出处： http://blog.csdn.net/x605940745

源码下载: http://download.csdn.net/detail/x605940745/6772637