android 手电筒

来源：互联网发布：创业软件上市时间编辑：程序博客网时间：2024/04/29 14:59

代码地址：http://download.csdn.net/detail/u011324501/9422876

简单的手电筒代码：

MainActivity.java

package com.example.flashlight;import android.hardware.Camera;import android.hardware.Camera.Parameters;import android.os.Bundle;import android.os.Handler;import android.app.Activity;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity {  private boolean isopent = false; private Camera camera; private Button button; boolean is = true; boolean sosflag = true; Button sos;    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        View view = View.inflate(this, R.layout.main, null);        setContentView(view);        button = (Button) findViewById(R.id.main_img);        //手电筒开关按钮        button.setOnClickListener(new View.OnClickListener() {             @Override            public void onClick(View v) {                // TODO Auto-generated method stub            is=false;            try{                if (!isopent) {                on();                } else {                off();                }            }catch(Exception e){            e.printStackTrace();            }            }        });        //sos按钮        sos = (Button)findViewById(R.id.sos);        sos.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubif(sosflag){        //开启线程handler.removeCallbacks(runnable);handler.postDelayed(runnable,1000);sosflag=false;        }else{        //关闭线程        handler.removeCallbacks(runnable);        }       }});                    }   //sos线程    private Handler handler = new Handler();        private Runnable runnable = new Runnable() {             public void run () {             on();             delay(500);             off();             handler.postDelayed(this,1000);           }        };                   /**         * 延时函数         * @param ms         */        private void delay(int ms){          try {              Thread.currentThread();              Thread.sleep(ms);          } catch (InterruptedException e) {              e.printStackTrace();          }        }       /*     * 打开手电筒     * */    public void on(){    button.setBackgroundResource(R.drawable.on);            // Toast.makeText(getApplicationContext(), "您已经打开了手电筒", 0).show();             camera = Camera.open();             Parameters params = camera.getParameters();             params.setFlashMode(Parameters.FLASH_MODE_TORCH);             camera.setParameters(params);             camera.startPreview(); // 开始亮灯             isopent = true;    }    //关闭手电筒    public void off(){     button.setBackgroundResource(R.drawable.off);            // Toast.makeText(getApplicationContext(), "关闭了手电筒", Toast.LENGTH_SHORT).show();             camera.stopPreview(); // 关掉亮灯             camera.release(); // 关掉照相机             isopent = false;    }}

布局文件：main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >     <Button        android:id="@+id/main_img"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:background="@drawable/off"        >    </Button>    <Button        android:id="@+id/sos"        android:layout_width="50dip"        android:layout_height="40dip"        android:textSize="15sp"        android:layout_alignBaseline="@+id/main_img"        android:layout_alignBottom="@+id/main_img"        android:layout_centerHorizontal="true"        android:text="@string/sos" /> </RelativeLayout>

用到的权限：

<!-- 摄像头、手电筒 -->    <uses-permission android:name="android.permission.CAMERA" />    <uses-permission android:name="android.permission.FLASHLIGHT" />     <uses-feature android:name="android.hardware.camera" />    <uses-feature android:name="android.hardware.camera.autofocus" />    <uses-feature android:name="android.hardware.camera.flash" />

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