[Android] Android 锁屏实现与总结 (一)

实现锁屏的方式有多种(锁屏应用、悬浮窗、普通Activity伪造锁屏等等)。但国内比较主流并且被广泛应用的Activity伪造锁屏方式。

 

实例演示图片如下:

Android 锁屏实现

 

系列文章链接如下:

[Android] Android 锁屏实现与总结 (一)

[Android] Android 锁屏实现与总结 (二)

[Android] Android 锁屏实现与总结 (三)

代码文件地址:

https://github.com/wukong1688/Android-BaseLockScreen

 

1、广播注册

2、Activity设置

3、按键的屏蔽

4、滑屏解锁

 

Activity实现自定义锁屏页的思路很简单,即在听书模式开启时,启动一个service,在service中监听系统SCREEN_OFF的广播。当屏幕熄灭时service监听到广播,开启一个锁屏页Activity在屏幕最上层显示,该Activity创建的同时会去掉系统的锁屏(如果有密码是禁不掉的)。示意图如下:

 

二、重要实现

1、广播注册

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

 注意:SCREEN_OFF广播监听必须是 动态注册 的,如果在AndroidManifest.xml中静态注册将无法接收到SCREEN_OFF广播。

 

LockScreenService.java

详细代码如下:

package com.jack.applockscreen.service;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.BitmapFactory;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v4.app.NotificationCompat;
import android.widget.Toast;

import com.jack.applockscreen.R;
import com.jack.applockscreen.activity.DetailActivity;
import com.jack.applockscreen.activity.LockScreenActivity;
import com.jack.applockscreen.receiver.LockScreenReceiver;

public class LockScreenService extends Service {
    private LockScreenReceiver mReceiver;
    private IntentFilter mIntentFilter = new IntentFilter();
    private boolean isNotiShow = false;

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

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        //动态注册
        mIntentFilter.addAction(Intent.ACTION_BOOT_COMPLETED);
        mIntentFilter.addAction(Intent.ACTION_SCREEN_OFF);
        mIntentFilter.addAction(Intent.ACTION_SCREEN_ON);
        mIntentFilter.addAction(Intent.ACTION_TIME_TICK);

        mIntentFilter.setPriority(Integer.MAX_VALUE);
        if (null == mReceiver) {
            mReceiver = new LockScreenReceiver();
            mIntentFilter.setPriority(Integer.MAX_VALUE);
            registerReceiver(mReceiver, mIntentFilter);

            buildNotification();
            Toast.makeText(getApplicationContext(), "开启成功", Toast.LENGTH_LONG).show();
        }

        return START_STICKY;
    }

    /**
     * 通知栏显示
     */
    private void buildNotification() {
        if (!isNotiShow){ //避免多次显示
            NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
            Intent intent = new Intent(this, DetailActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            Notification notification = new NotificationCompat.Builder(this, "default")
                    .setTicker("APP正在运行")
                    .setAutoCancel(false)
                    .setContentTitle("APP正在运行")
                    .setContentText("运行中")
                    .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setContentIntent(pendingIntent)
                    .build();
            manager.notify(1, notification);

            startForeground(0x11, notification);

            isNotiShow = true;
        }
    }

    @Override
    public void onDestroy() {
        if (mReceiver != null) {
            unregisterReceiver(mReceiver);
            mReceiver = null;
        }
        super.onDestroy();
    }
}

 

广播接收 LockScreenReceiver.java

package com.jack.applockscreen.receiver;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telecom.TelecomManager;
import android.telephony.TelephonyManager;

import com.jack.applockscreen.activity.LockScreenActivity;
import com.jack.applockscreen.util.Parser;

public class LockScreenReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (Intent.ACTION_SCREEN_OFF.equals(action)) {
            if (Parser.sPhoneCallState == TelephonyManager.CALL_STATE_IDLE) { // 手机状态为未来电的空闲状态
                // 判断锁屏界面是否已存在,如果已存在就先finish,防止多个锁屏出现
                if (!Parser.KEY_GUARD_INSTANCES.isEmpty()) {
                    for (Activity activity : Parser.KEY_GUARD_INSTANCES) {
                        activity.finish();
                    }
                }
                Intent lockScreen = new Intent(context, LockScreenActivity.class);
                lockScreen.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
                context.startActivity(lockScreen);
            }
        } else {
            Parser.killBackgroundProcess(context);
        }
    }
}

 

 注意:

1) 标志位FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS,是为了避免在最近使用程序列表出现Service所启动的Activity。

2) 启动Activity时Intent的Flag,如果不添加FLAG_ACTIVITY_NEW_TASK的标志位,会出现“Calling startActivity() from outside of an Activity”的运行时异常,因为我们是从Service启动的Activity。Activity要存在于activity的栈中,而Service在启动activity时必然不存在一个activity的栈,所以要新起一个栈,并装入启动的activity。使用该标志位时,也需要在AndroidManifest中声明taskAffinity,即新task的名称,否则锁屏Activity实质上还是在建立在原来App的task栈中。


下接:
 

本博客地址: wukong1688

本文原文地址:https://www.cnblogs.com/wukong1688/p/10716875.html

转载请著名出处!谢谢~~

 

posted @ 2019-04-16 14:29  wukong1688  阅读(8139)  评论(0编辑  收藏  举报