本文实例为大家分享了Android实现简单手电筒功能的具体代码,供大家参考,具体内容如下
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<? xml version = "1.0" encoding = "utf-8" ?> < RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:app = "http://schemas.android.com/apk/res-auto" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".Switch_Activity" > < ImageButton android:id = "@+id/imageButton" android:layout_width = "225dp" android:layout_height = "wrap_content" android:layout_alignParentTop = "true" android:layout_centerHorizontal = "true" android:layout_marginTop = "267dp" app:srcCompat = "@drawable/off" /> <!-- android:layout_centerHorizontal="true" 水平居中--> < SurfaceView android:id = "@+id/surfaceView" android:layout_width = "378dp" android:layout_height = "221dp" android:layout_alignParentStart = "true" android:layout_alignParentLeft = "true" android:layout_alignParentTop = "true" android:layout_marginStart = "23dp" android:layout_marginLeft = "23dp" android:layout_marginTop = "29dp" /> </ RelativeLayout > |
Java:
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package com.example.flashlightactivite; import android.Manifest; import android.content.pm.PackageManager; import android.hardware.Camera; import android.os.Build; import android.support.v4.app.ActivityCompat; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.ImageButton; public class Switch_Activity extends AppCompatActivity { ImageButton flashLightSwitch; boolean flag = false ; SurfaceView surfaceView; Camera camera; Camera.Parameters camera_parameters; //相机参数 // 设置摄像头分辨率与设备支持的分辨率 // Camera.Size camera_size; SurfaceHolder surfaceHolder; // SurfaceHolder是一个接口,其作用就像一个关于Surface的监听器。提供访问和控制SurfaceView背后的Surface 相关的方法 // ***** 一定要在 AndroidManifest.xml 中添加权限:<uses-permission android:name="android.permission.CAMERA"></uses-permission> // <uses-permission android:name="android.permission.FLASHLIGHT"/> // 权限 PERMISSION_STORAGE:允许存储 private static String [] PERMISSION_STORAGE = { Manifest.permission.CAMERA }; // 请求动态码 REQUEST_PERMISSION_CODE:请求许可代码 private static int REQUEST_PERMISSION_CODE = 1 ; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate( savedInstanceState ); setContentView( R.layout.activity_switch_ ); // 判断版本号 与 棒棒糖版本号 的等级 if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP){ // checkSelfPermission: 自我检查权限 if (ActivityCompat.checkSelfPermission( this ,Manifest.permission.CAMERA ) != PackageManager.PERMISSION_GRANTED){ ActivityCompat.requestPermissions( this ,PERMISSION_STORAGE,REQUEST_PERMISSION_CODE ); } } flashLightSwitch = findViewById( R.id.imageButton ); surfaceView = findViewById( R.id.surfaceView ); camera = Camera.open(); camera_parameters = camera.getParameters(); surfaceHolder = surfaceView.getHolder(); surfaceHolder.addCallback( new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { try { camera.setPreviewDisplay( surfaceHolder ); } catch (Exception e){ // 释放 camera 对象 camera.release(); } camera.startPreview(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { } } ); // ImageButton 添加点击事件 flashLightSwitch.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { if ( !flag ) { // 改变 flag 的值 flag = true ; // 更改图片 R.包.图 flashLightSwitch.setImageResource( R.drawable.on ); // 设置 flash 的类型 闪光模式:火炬 camera_parameters.setFlashMode( Camera.Parameters.FLASH_MODE_TORCH ); camera.setParameters( camera_parameters ); } else { flashLightSwitch.setImageResource( R.drawable.off ); flag = false ; // 关闭 flash camera_parameters.setFlashMode( Camera.Parameters.FLASH_MODE_OFF ); camera.setParameters( camera_parameters ); } } } ); } } /* * FLASH_MODE_RED_EYE防红眼模式,减小或阻止图片上的人物像的红眼出现。 FLASH_MODE_TORCH填充模式,在正常光照下会减弱闪光强度。 FLASH_MODE_AUTO自动模式,有需要的时候会自动闪光。 FLASH_MODE_OFF 闪光模式将不会被关闭 FLASH_MODE_ON 快照时闪光模式将永远被关闭 * */ |
AndroidManifest.xml :
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<!-- 添加权限 --> < uses-permission android:name = "android.permission.CAMERA" /> < uses-permission android:name = "android.permission.FLASHLIGHT" /> < uses-feature android:name = "android.hardware.Camera" /> |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/weixin_43671362/article/details/101102073