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

amera.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)

效果如下：

源码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:background="@drawable/light" tools:context=".MainActivity" > <com.android.xiong.xionglight.LightBkView android:id="@+id/light1" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </RelativeLayout> <uses-permission android:name="android.permission.CAMERA" />

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; } } }