Question

我们已经检查过$( ".present a" ).click(function() { $.cookie($(this).attr('href'), true); });和CATEGORY_MAIN，但即使这样，也会启动2个活动实例。

SplashActivity.java

!isTaskRoot()

日志

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

    Log.i("OnCreate method.");

    if(checkIfActivityIsBroughtToFront() || checkIfActivityIsRootTask()) {
        return; // Found that if we finish and don't return then it will run the code below, hence start the recovery task.
    }

    Log.i("Checking if Recovery is required ...");
    new RecoveryTask(SplashActivity.this, this).execute();
}

private boolean checkIfActivityIsBroughtToFront() {
    if ((getIntent().getFlags() & Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT) != 0) {
        // Activity was brought to front and not created,
        // Thus finishing this will get us to the last viewed activity
        Log.i("Detecting a brought to front, no need for recovery.");
        finish();

        return true;
    }

    return false;
}

private boolean checkIfActivityIsRootTask() {
    if (!isTaskRoot()) {
        final Intent intent = getIntent();
        final String intentAction = intent.getAction();
        if (intent.hasCategory(Intent.CATEGORY_LAUNCHER) && intentAction != null && intentAction.equals(Intent.ACTION_MAIN)) {
            Log.i("Main Activity is not the root. " + "Finishing Main Activity instead of launching.");
            finish();

            return true;
        }
    }

    return false;
}

清单

2015-10-22 13:42:25.581 +0300 SplashActivity INFO[main] - OnCreate method.
2015-10-22 13:42:25.587 +0300 SplashActivity INFO[main] - Checking if Recovery is required ...
2015-10-22 13:42:25.637 +0300 SplashActivity INFO[main] - OnCreate method.
2015-10-22 13:42:25.638 +0300 SplashActivity INFO[main] - Checking if Recovery is required ...
2015-10-22 13:42:25.828 +0300 GeoFenceManager INFO[pool-5-thread-1] - Removing geofences ...
2015-10-22 13:42:25.872 +0300 GeoFenceManager INFO[pool-5-thread-2] - Removing geofences ...

更新：这是在重启后发生的，BOOT_COMPLETED监听器正在跟随

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="x.y.z"
    android:installLocation="internalOnly" >
<application
        android:name=".global.GlobalInstance"
        android:allowBackup="true"
        android:allowClearUserData="true"
        android:hardwareAccelerated="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:largeHeap="true"
        android:persistent="true" >

        <activity
            android:name=".activity.SplashActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:theme="@style/Theme.Background" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <receiver
            android:name=".receiver.BootUpReceiver"
            android:enabled="true"
            android:permission="android.permission.RECEIVE_BOOT_COMPLETED" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </receiver>

知道如何预防这种情况吗？

Answer 1

将android：launchMode =“SingleTask”添加到xml中的splash活动元素。然后离开活动，即远离泼水通话结束（）。您应该使用此模式而不是“SingleInstance”的原因是用户永远不能使用反键导航回到启动画面（因为这不是正常行为）。

Answer 2

   private boolean checkIfActivityIsRootTask() { 
    if (!isTaskRoot()) {
    final Intent intent = getIntent();
    final String intentAction = intent.getAction();
    if (intent.hasCategory(Intent.CATEGORY_LAUNCHER) && intentAction != null && intentAction.equals(Intent.ACTION_MAIN)) {
          Log.i("Main Activity is not the root. " + "Finishing Main Activity   instead of launching.");
        finish();

        return true; 
      } 
   } 

return false; 
} ?

如果此活动是roottask，则返回false; 什么是RecoveryTask？

Answer 3

你说：

我们已经检查过CATEGORY_MAIN和！isTaskRoot（）

但是检查都失败了。在您附加的日志中，创建两个实例时，日志中不会打印Detecting a brought to front, no need for recovery.和Main Activity is not the root. " + "Finishing Main Activity instead of launching.。这意味着在两种方法中都不会遇到if部分，因此永远不会执行finish()。这两个方法都返回false。

另外，仅仅因为您在finish()中呼叫return和onCreate()，并不意味着不会调用onStart()或onResume()。

为什么会发生这种情况？ Launcher活动永远不会被调用两次（考虑到你没有在内部启动活动）。可能是用户拥有的某些SDK中的错误。

可能的修正： 您可以尝试在android:launchMode="singleTop"的清单中设置SplashActivity。这将确保只维护一个实例。

多个活动实例

3 个答案: