QQ音乐锁屏实现

不需要权限

讲解部分:
http://blog.csdn.net/working_harder/article/details/52629919

代码实现

Mainnifest.xml

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


    <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"   android:theme="@style/MainActivityTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <service
            android:name=".MyService"
            android:enabled="true"
            android:exported="true"></service>

        <!-- 我们无法监听Home按键, 但是可以改变因Home进入后台时的处理, 比如在Manifest的activity声明中加上android:noHistory="true"
         这样如果用户通过Home按键让我们的应用进入后台, 我们会让这个activity销毁, 就像我们被滑动关闭一样.
         如果不加, 最好重写Activity的onNewIntent来应对  因Home  进入后台, 然后Service再次启动  锁屏Activity  的情况. -->
        <activity android:excludeFromRecents="true"
            android:noHistory="true"

            android:exported="false"

            android:launchMode="singleInstance"

            android:name=".LockScreenActivity"

            android:screenOrientation="portrait"

            android:taskAffinity="com.ruulai.tools.LockScreenActivity"

            android:theme="@style/MyTheme">

        </activity>

        <!--
        上面的属性中android:excludeFromRecents="true"让锁屏Activity不显示在近期任务中,
        android:launchMode="singleInstance"和android:taskAffinity="com.package.name.lockscreen"保证锁屏Activity有一个单独的Task, 且这个Task里永远只有它一个实例.
        -->

    </application>

</manifest>

主题 style.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>


    <style name="MainActivityTheme" parent="AppTheme">
        <!--我们的锁屏Activity在滑动”解锁”之后, 理论上是直接进入下面的界面, 但有时如果下面不是launcher, 而是一个app, 有可能会闪一下黑屏, 这个其实是底下activity的入场动画导致的, 某些Android版本会对顶部activity透明时处理有些奇怪, 我们不能保证其他的应用不闪黑屏, 但是对自己的的应用还是可以的, 只需要在我们的主体activity的style中加上 -->
        <item name="android:windowAnimationStyle">@null</item>
    </style>


    <style name="MyTheme" parent="AppTheme">
            <item name="android:windowIsTranslucent">true</item>

            <item name="android:windowBackground">@android:color/transparent</item>

            <item name="android:colorBackgroundCacheHint">@null</item>

            <item name="android:windowNoTitle">true</item>

            <item name="android:backgroundDimEnabled">false</item>

            <item name="android:windowAnimationStyle">@null</item>

            <item name="android:windowContentOverlay">@null</item>


    </style>
</resources>

Service

package com.ruulai.tools;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service {

    private BroadcastReceiver broadcastReceiver;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }


    @Override
    public void onCreate() {
        super.onCreate();
        broadcastReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();

                Toast.makeText(MyService.this, "收到锁屏消息", Toast.LENGTH_SHORT).show();


                if (action.equals(Intent.ACTION_SCREEN_OFF)) {

                    Intent lockscreen = new Intent(MyService.this, LockScreenActivity.class);

                    lockscreen.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // ------->

                    startActivity(lockscreen);
                    Toast.makeText(MyService.this, "启动锁屏Activity", Toast.LENGTH_SHORT).show();

                }
            }
        };

        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(Intent.ACTION_SCREEN_OFF);
        registerReceiver(broadcastReceiver, intentFilter);



    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        Log.d("MyService", "Service Start");

        return START_NOT_STICKY;
    }
}

锁屏Activity

package com.ruulai.tools;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.WindowManager;
import android.widget.Toast;

public class LockScreenActivity extends AppCompatActivity{


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        this.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD |
                WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);

        setContentView(R.layout.lock);

    }

    @Override
    public void onBackPressed() {
//        锁屏界面当然不响应Back按键, 只需要重写Activity的onBackPressed方法即可


    }

    public void test(View view) {

        Toast.makeText(this, "你点击了Test", Toast.LENGTH_SHORT).show();


    }


    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);

    }
}

MainActivity

package com.ruulai.tools;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class MainActivity extends AppCompatActivity {


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


    }


    public void open(View view) {

        Intent intent = new Intent();
        intent.setClass(this, MyService.class);
        startService(intent);

    }

}