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安卓中编写手电筒程序 Android中编写简单的手电筒小应用的实例教程

剑萧舞蝶 人气:0
想了解Android中编写简单的手电筒小应用的实例教程的相关内容吗,剑萧舞蝶在本文为您仔细讲解安卓中编写手电筒程序的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:Android,手电筒,闪光灯,安卓,下面大家一起来学习吧。

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:

2016415154352940.jpg (480×854)2016415154422076.jpg (480×854)

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; 
    } 
  } 
 
} 

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