Android 6.0 闪光灯的使用

Android6.0 已经抛弃了Camer 相关的API，改用新的API接口CamerManager，下面给出使用的简单实例

package com.inper.duqiang.slashlight;

import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraManager;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.ToggleButton;

public class MainActivity extends Activity {

    private CameraManager manager;
    private Camera camera = null;
    private Camera.Parameters parameters = null;
    public static boolean kaiguan = true; // 定义开关状态，状态为false，打开状态，状态为true，关闭状态

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        super.onCreate(savedInstanceState);

        manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

        try {
            String [] camerList = manager.getCameraIdList();
            for (String str:camerList
                 ) {
                Log.d("List",str);
            }
        } catch (CameraAccessException e) {
            Log.e("error",e.getMessage());
        }
        Button open_btn = (Button) findViewById(R.id.open_btn);

        open_btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                if (isLOLLIPOP()) {
                    try {
                        manager.setTorchMode("0", true);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }
            }
        });

        Button close_btn = (Button) findViewById(R.id.close_btn);
        close_btn.setOnClickListener(closeOnClickListener);

        ToggleButton toggle_btn = (ToggleButton) findViewById(R.id.toggle_btn);
        toggle_btn.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                try {
                    manager.setTorchMode("1", isChecked);
                } catch (CameraAccessException e) {
                    e.printStackTrace();
                }
            }
        });
    }

    private View.OnClickListener closeOnClickListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (isLOLLIPOP()) {
                try {
                    manager.setTorchMode("0", false);
                } catch (CameraAccessException e) {
                    e.printStackTrace();
                }
            }
        }
    };
    /**
     * 判断Android系统版本是否 >= LOLLIPOP(API21)
     *
     * @return boolean
     */
    private boolean isLOLLIPOP() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            return true;
        } else {
            return false;
        }
    }
}

Layout的布局

<?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:id="@+id/activity_main"
    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.inper.duqiang.slashlight.MainActivity">

    <ToggleButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/toggle_btn"/>
    <Button
        android:layout_below="@+id/toggle_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="打开闪光灯"
        android:id="@+id/open_btn"/>
    <Button
        android:layout_below="@+id/toggle_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/open_btn"
        android:text="关闭闪光灯"
        android:id="@+id/close_btn"/>
</RelativeLayout>

Anf文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.inper.duqiang.slashlight">

    <!-- 打开Camera的权限 -->
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.autofocus" />

    <!-- 开启闪光灯权限 -->
    <uses-permission android:name="android.permission.FLASHLIGHT" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>