Android8.0马上就要发布,Google对于安卓市场上各种应用占据内存空间的问题不断进行内存完善,我们的应用进程很难再保持不死之身,以前的服务唤醒在5.0已经失效,现在我们尽可能的做到保活方式就是提高进程的优先级,本文介绍一种1像素Activity保活进程的实现(据说QQ也在用)。
其整个逻辑就是在手机屏幕黑屏时,我们启动一个1像素的Activity,其占用内存很小毕竟只有1像素嘛,无形中减小了内存的回收几率,在屏幕亮的时候就关闭该页面。直接上代码实现:
首先需要在MainActivity中注册一个监听手机屏幕状态的广播监听:
mOnepxReceiver = new OnePixelReceiver();IntentFilter intentFilter = new IntentFilter();intentFilter.addAction("android.intent.action.SCREEN_OFF");intentFilter.addAction("android.intent.action.SCREEN_ON");intentFilter.addAction("android.intent.action.USER_PRESENT");registerReceiver(mOnepxReceiver, intentFilter);
监听到屏幕状态后的处理:
/** * Created by Administrator on 2017/7/10. * 监听屏幕状态的广播 */public class OnePixelReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) { Intent it = new Intent(context, OnePiexlActivity.class); it.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(it); } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) { context.sendBroadcast(new Intent("finish")); Intent main = new Intent(Intent.ACTION_MAIN); main.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); main.addCategory(Intent.CATEGORY_HOME); context.startActivity(main); } }}
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创建我们的1像素的Activity:
/** * Created by Administrator on 2017/7/10. */public class OnePiexlActivity extends Activity { private BroadcastReceiver endReceiver; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Window window = getWindow(); window.setGravity(Gravity.LEFT | Gravity.TOP); WindowManager.LayoutParams params = window.getAttributes(); params.x = 0; params.y = 0; params.height = 1; params.width = 1; window.setAttributes(params); endReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { finish(); } }; registerReceiver(endReceiver, new IntentFilter("finish")); checkScreen(); } @Override protected void onResume() { super.onResume(); checkScreen(); } /** * 检查屏幕状态 isScreenOn为true 屏幕“亮”结束该Activity */ private void checkScreen() { PowerManager pm = (PowerManager) OnePiexlActivity.this.getSystemService(Context.POWER_SERVICE); boolean isScreenOn = pm.isScreenOn(); if (isScreenOn) { finish(); } }}
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我们还需要设置1像素activity为透明,不然可能会影响体验,但是影响不大,1像素毕竟是挑战视力的存在。
<style name="OnePixelActivity" parent="android:Theme.Holo.Light.NoActionBar" <item name="android:windowIsTranslucent">true</item </style>
AndroidManifest重配置
<activity android:name=".OnePiexlActivity" android:screenOrientation="portrait" android:theme="@style/OnePixelActivity"></activity>
以上为1像素保活进程的基本实现,后续在学习Notication提高进行优先级保活后分享。