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Android 手电筒开发源代码

2024-11-25 08:32:39   203人阅读

实现步骤

1. 修改布局文件代码activity_main.xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2     xmlns:tools="http://schemas.android.com/tools" 3     android:layout_width="match_parent" 4     android:layout_height="match_parent" 5     android:orientation="vertical"> 6  7    <Button  8        android:id="@+id/btn_flash" 9        android:layout_width="match_parent"10        android:layout_height="wrap_content"11        android:text="手电筒已关闭！"/>12 13 </LinearLayout>

 

2. 在AndroidManifest.xml中增加需要使用的权限

1 <!-- 摄像头、手电筒 -->2 <uses-permission android:name="android.permission.CAMERA" />3 <uses-permission android:name="android.permission.FLASHLIGHT" />4 <uses-feature android:name="android.hardware.camera" />5 <uses-feature android:name="android.hardware.camera.autofocus" />6 <uses-feature android:name="android.hardware.camera.flash" />
  • android.permission.CAMERA：Required to be able to access the camera device.
  • android.permission.FLASHLIGHT：Allows access to the flashlight

3. 修改MainActivity

 1 package com.example.test; 2  3 import android.app.Activity; 4 import android.hardware.Camera; 5 import android.hardware.Camera.Parameters; 6 import android.os.Bundle; 7 import android.view.View; 8 import android.view.View.OnClickListener; 9 import android.widget.Button;10 import android.widget.Toast;11 12 public class MainActivity extends Activity {13 14     private boolean isopen = false; //记录手电筒状态15     private Camera camera; //16     private Button btn_flash;17 18     @Override19     protected void onCreate(Bundle savedInstanceState) {20         // TODO Auto-generated method stub21         super.onCreate(savedInstanceState);22         setContentView(R.layout.activity_main);23 24         btn_flash = (Button) findViewById(R.id.btn_flash);25         btn_flash.setOnClickListener(new OnClickListener() {26             @Override27             public void onClick(View v) {28                 if (!isopen) { //如果手电筒已经开启29                     Toast.makeText(getApplicationContext(), "手电筒已开启", 0).show();30                     camera = Camera.open();31                     Parameters params = camera.getParameters();32                     params.setFlashMode(Parameters.FLASH_MODE_TORCH);33                     camera.setParameters(params);34                     camera.startPreview(); // 开始亮灯35                     isopen = true;36                     btn_flash.setText("手电筒已开启！");37                 } else {38                     Toast.makeText(getApplicationContext(), "关闭了手电筒",39                             Toast.LENGTH_SHORT).show();40                     camera.stopPreview(); // 关掉亮灯41                     camera.release(); // 关掉照相机42                     isopen = false;43                     btn_flash.setText("手电筒已关闭！");44                 }45             }46         });47     }48 49 }

Android 手电筒开发源代码


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