为什么调用finish()会导致调用onCreate(),启动一个新的Activity？

Question

(是的,我已经查看了与此问题相关的现有问题.)

我finish()从我的Activity的Up按钮监听器调用.但是,虽然onDestroy()确实被称为被调用,但首先onPause()被调用然后,令人惊讶的onCreate()是,这导致了真正的问题.为什么ScanningActivity通过调用finish()ScanningActivity方法启动新的操作？

我正在记录所有生命周期函数的调用,顺序是这样的:

 inside onClick() Listener for up button.
         Inside onPause()
         Inside onCreate()  // this is what's hosing everything
         Inside onStart()
         Inside onResume()
         Inside onWindowFocusChanged()
         Inside onStop()
         Inside onDestroy()

为什么我在调用后会收到这一系列事件finish()？这是在侦听器ScanningActivity中调用finish(),通知的代码onclick(在onCreate()方法中分配):

@Override
public void onCreate(Bundle savedInstanceState)
{
    . . .

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) 
        {
            Log.i("ScanningActivity", "inside onClick() -- Listener for up button being executed.");

            android.widget.LinearLayout layt = (android.widget.LinearLayout) vCustView;

            View vTemp = layt.findViewById(R.id.scanning_up);
            if (null != vTemp)
            {
                Button btnUp = (Button) vTemp;
                if (!btnUp.getText().equals("End"))  
                {
                    setResult(RESULT_CANCELED);

                    finish();
                    return;
                }
            }
         }
    . . .
}

按照Karakuri的要求,这里有清单:

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

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    //
    <uses-permission android:name="android.permission.SET_DEBUG_APP" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

        <uses-feature android:name="android.hardware.camera" />
        <uses-feature android:name="android.hardware.camera.autofocus" />

        <uses-permission android:name="android.permission.CAMERA" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ail_logo"
        android:label="@string/app_name"
        android:theme="@style/AssistTheme">
        <activity
            android:name=".HomeScreenActivity"
            android:label="@string/title_activity_home_screen"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".GradeActivity"
            android:label="@string/title_activity_grade_assessment"
            android:screenOrientation="portrait"
            android:parentActivityName=".HomeScreenActivity"
            android:noHistory="true"
            />
        <activity
            android:name=".ScanningActivity"
            android:label="@string/title_activity_scanning"
            android:screenOrientation="portrait"
            android:parentActivityName=".GradeActivity"
            />
    </application>


</manifest>

...这里是调用代码,最初ScanningActivity从内部启动GradeActivity:

if (bFinishedSuccessfully)
{
    try
    {
        Log.i("GradeActivity", "SOMEHOW THIS IS AGAIN STARTING THE ScanningActivity!!!");

        Intent intent = new Intent(this, ScanningActivity.class);
        intent.putExtra("SessionInfo", m_hmActivate);
        startActivity(intent);
    }
    catch (Exception ex)
    {
        Log.i("GradeActivity", "ex: " + ex.getMessage());
    }
}

更新:我稍微修改了清单和调用代码,试图解决这个问题,但无济于事.行为仍然完全如最初描述的那样.我用mods更新了这个问题.

Answer 1

我认为问题出在您的清单上，即android:noHistory="true"添加到 GradeActivity 的参数。ScanningActivitysetResult()将尝试创建父 Activity GradeActivity。我认为，如果您不需要在导航堆栈上保留 GradeActivity，则必须使用 startActivityForResult 从 HomeScreenActivity 启动 ScanningActivity。