(是的,我已经查看了与此问题有关的现有问题。)为什么调用finish()导致onCreate()被调用,开始一个新的Activity?
我从我的Activity的Up按钮侦听器中调用finish()
。但虽然onDestroy()
确实被调用,但首先调用了onPause()
,然后令人惊讶地发现onCreate()
,这导致了真正的问题。为什么通过调用ScanningActivity的finish()
方法启动新的ScanningActivity
?
我记录所有的生命周期函数调用和顺序是这样的:
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()
为什么我收到以下内容finish()
呼叫事件的顺序?下面是ScanningActivity
代码调用finish()
,通知,在onclick
监听器(这是onCreate()
方法中指定):
@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Karakuri的要求这里的清单:
<?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>
...这里是呼叫代码,其最初从GradeActivity
内部启动ScanningActivity
:
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。我已经用mods更新了这个问题。
您已经发布并没有提供足够的信息的代码。你能向我们展示你的AndroidManifest吗?此外,它看起来像这个活动开始的结果。也许你应该在调用活动中包含一些代码? – Karakuri
@Karakuri,我添加了您请求的信息。我希望这已经足够了。 – Alyoshak
在您发布的事件序列中,哪个“活动”正在记录每种方法? – Bryan