Android打开闪光灯

代码如下：

Java代码：

package com.example.x.newlight; import android.app.Activity; import android.content.pm.FeatureInfo; import android.content.pm.PackageManager; import android.hardware.Camera; import android.os.Bundle; import android.view.View; import android.view.WindowManager; import android.widget.ToggleButton; public class MainActivity extends Activity implements View.OnClickListener { private ToggleButton toggleButton; private Camera m_Camera; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // initLight(); toggleButton = (ToggleButton)this.findViewById(R.id.toggleButton1); toggleButton.setOnClickListener(this); getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); } @Override public void onClick(View v) { ToggleButton toggleButton = (ToggleButton) v; if (!toggleButton.isChecked()){ initLight(); m_Camera.startPreview(); }else { m_Camera.stopPreview(); m_Camera.release(); m_Camera = null; } } private void initLight() { PackageManager pm = this.getPackageManager(); FeatureInfo[] features = pm.getSystemAvailableFeatures(); for (FeatureInfo f : features) { if (PackageManager.FEATURE_CAMERA_FLASH.equals(f.name)) //判断设备是否支持闪光灯 { System.out.println("支持"); if (null == m_Camera) { m_Camera = Camera.open(); } Camera.Parameters parameters = m_Camera.getParameters(); parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH); m_Camera.setParameters(parameters); } else { System.out.println("不支持"); } } } }

xml代码：

<?xml version="1.0" encoding="utf-8"?> <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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.x.newlight.MainActivity"> <ToggleButton android:id="@+id/toggleButton1" android:layout_width="match_parent" android:layout_height="match_parent" android:checked="true" android:text="ToggleButton"/> </RelativeLayout>

权限：

<uses-permission android:name="android.permission.FLASHLIGHT"/> <uses-permission android:name="android.permission.WAKE_LOCK"/> <uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.hardware.camera"/>