令人费解的行为与REORDER_TO_FRONT

Question

令人费解的行为与REORDER_TO_FRONT

活动A启动活动B,没有标记.堆栈现在是AB,顶部是B. B使用FLAG_ACTIVITY_REORDER_TO_FRONT(唯一标志)启动活动A. 我希望这个堆栈现在是BA.但是,当此时按下后退按钮时,它将返回主屏幕.在这里,我希望将活动B带到前面.再次单击启动器图标后,应用程序将打开,其中B作为运行活动,堆栈中没有任何内容.

Launchmode是清单中的标准(默认).

这是预期的行为,我只是不理解它？

编辑:我创建了一个没有混淆因素的测试项目,仍然看到相同的行为.我只是不明白它,它似乎不是每个文档.

编辑:对我来说这个行为似乎是框架中的一个BUG,请参阅下面的答案我的评论.我需要一个解决方法.

public class MainActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
public void onClickBtn(View view)
{
    Intent flowIntent = new Intent(this, SecondActivity.class);
    startActivity(flowIntent);
}
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}

public class SecondActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
    }

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
public void onClickBtn(View view)
{
    Intent flowIntent = new Intent(this, MainActivity.class);
    flowIntent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    startActivity(flowIntent);

}
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}

清单:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android&quot;
    package="com.example.tester"
    android:versionCode="1"
    android:versionName="1.0" >
 <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.tester.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
         <activity
            android:name="com.example.tester.SecondActivity" />
    </application>
</manifest>

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}

public class SecondActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); }

public class MainActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
public void onClickBtn(View view)
{
    Intent flowIntent = new Intent(this, SecondActivity.class);
    startActivity(flowIntent);
}
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}

或者

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
public void onClickBtn(View view)
{
    Intent flowIntent = new Intent(this, MainActivity.class);
    flowIntent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    startActivity(flowIntent);

}
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}

public class SecondActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
    }

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android&quot;
    package="com.example.tester"
    android:versionCode="1"
    android:versionName="1.0" >
 <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.tester.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
         <activity
            android:name="com.example.tester.SecondActivity" />
    </application>
</manifest>

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} 它转到另一台PC,添加它

public class MainActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
public void onClickBtn(View view)
{
    Intent flowIntent = new Intent(this, SecondActivity.class);
    startActivity(flowIntent);
}
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}

public class SecondActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
    }

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
public void onClickBtn(View view)
{
    Intent flowIntent = new Intent(this, MainActivity.class);
    flowIntent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    startActivity(flowIntent);

}
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}

;-)

有关详细步骤,请查看此问题

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android&quot;
    package="com.example.tester"
    android:versionCode="1"
    android:versionName="1.0" >
 <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.tester.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
         <activity
            android:name="com.example.tester.SecondActivity" />
    </application>
</manifest>

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}

public class SecondActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); }

public class MainActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
public void onClickBtn(View view)
{
    Intent flowIntent = new Intent(this, SecondActivity.class);
    startActivity(flowIntent);
}
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}

是否有任何方法可以克隆已安装的流浪盒

Answer 1

小智 21

http://code.google.com/p/android/issues/detail?id=63570#c2

它已被谷歌确认为4.4.2的错误

我甚至可以在N预览2上看到这个错误 (3认同)

Answer 2

Ass*_*iel 8

首先,让我们先说你是对的!

但是如果我的逻辑是正确的,那么当你REORDER进入你的主Activity(the Launcher Activity)时会发生什么,Intent被设置为使得后退将返回到你的Launcher.

作为实验,尝试添加ActivityC并尝试REORDER从C到前面的B.即:
A-> B-> C ... A-> C-> B

如果订单对您非常重要,则可能需要覆盖Activity.onNewIntent()方法.

@Override
protected void onNewIntent(Intent intent) {
}

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Answer 3

小智 7

我找到了这个bug的简单解决方法.

覆盖onNewIntent并完成任何可能重新排序到前台活动的功能,如下所示,只是不完全测试,如果您发现此解决方法有任何问题,请通过ricotta.zhang@myriadgroup.com与我联系

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    if ((intent.getFlags() | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT) > 0) {
        mIsRestoredToTop  = true;
    }
}

@Override
public void finish() {
    super.finish();
    if (android.os.Build.VERSION.SDK_INT >= 19 && !isTaskRoot() && mIsRestoredToTop) {
        // 4.4.2 platform issues for FLAG_ACTIVITY_REORDER_TO_FRONT,
        // reordered activity back press will go to home unexpectly,
        // Workaround: move reordered activity current task to front when it's finished.
        ActivityManager tasksManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
        tasksManager.moveTaskToFront(getTaskId(), ActivityManager.MOVE_TASK_NO_USER_ACTION);
    }
}

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