Android之实现手电筒实例

来源：互联网发布：大数据风险管理编辑：程序博客网时间：2024/05/01 11:46

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：

<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;@Overrideprotected 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);}@Overridepublic 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);}@Overrideprotected 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@Overrideprotected 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@Overridepublic 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

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