Android 打开闪光灯

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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"/>

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