本文介绍了在Android 8.1版本的设备上完成“活动”后，如何防止屏幕方向发生变化？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在开发一个应用程序，但在8.1设备（Pixel2，Nexus5x）上遇到了奇怪的行为，因此我编写了一个小应用程序来验证此行为。
I'm working on an app and encountered a strange behavior on 8.1 Devices (Pixel2, Nexus5x), so I wrote a small App to verify this behavior.
MainActivity 被锁定为肖像模式，而 LandscapeActivity 被锁定为 landscape 。 MainActivity 为结果启动 LandscapeActivity 。屏幕按预期从肖像切换到风景。 LandscapeActivity 完成后，会将结果传播到 MainActivity ，同时切换回肖像（如预期）。
MainActivity is locked to portrait mode while LandscapeActivity is locked to landscape. MainActivity starts the LandscapeActivity for Result. Screen Switches from portrait to landscape as expected. When LandscapeActivity is finished it propagates the Result to MainActivity, while switching back to portrait (as expected).
但是有时候我在这里遇到了一个错误。在 MainActivity 中的 onActivityResult 之后，它从肖像切换为风景立即切换回肖像。虽然我可以处理此状态，但看起来仍然很讨厌。
But Sometimes I encounter kind of a bug here. After onActivityResult in MainActivity it switches from portrait to landscape to switch back to portrait immediately. While I can handle the state, it still looks nasty.
出于可追溯性，我将发布所有内容以对其进行重建。
For traceability I will post everything to rebuild it.
我该怎么做才能防止它发生？另请注意，它并非每次都发生，并且据我只能在8.1设备上进行测试。在8.1以下的android设备上似乎没问题
What can I do to prevent it? Also note that it does not happen every time, and as far as I can test on 8.1 devices ONLY. It seems fine on android devices below 8.1
编辑：
添加了 android：configChanges = orientation | screenSize 作为我的清单显示为@Floern，他在回答中建议未成功。
确认平台错误也将是可以接受的答案
Added android:configChanges="orientation|screenSize" to my manifest as @Floern suggested in his answer without success.A confirmation on a platform bug will be an acceptable answer, too
清单
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity"
android:screenOrientation="portrait"
android:configChanges="orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".LandscapeActivity"
android:screenOrientation="landscape"/>
</application>
MainActivity
MainActivity
public class MainActivity extends AppCompatActivity {
public static final String TAG = MainActivity.class.getSimpleName();
private static final int REQ_CODE = 878;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(TAG, "onCreate: savedInstanceState=" + savedInstanceState + ", orientation=" + orientation());
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, LandscapeActivity.class);
startActivityForResult(intent, REQ_CODE);
}
});
}
@Override
protected void onResume() {
Log.d(TAG, "onResume: orientation=" + orientation());
super.onResume();
}
@Override
protected void onPause() {
Log.d(TAG, "onPause: orientation=" + orientation());
super.onPause();
}
@Override
protected void onStart() {
Log.d(TAG, "onStart: orientation=" + orientation());
super.onStart();
}
@Override
protected void onStop() {
Log.d(TAG, "onStop: orientation=" + orientation());
super.onStop();
}
@Override
protected void onDestroy() {
Log.d(TAG, "onDestroy: orientation=" + orientation());
super.onDestroy();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Log.d(TAG, "onActivityResult: orientation=" + orientation());
if (requestCode == REQ_CODE){
Toast.makeText(this, "Result=" + data.getStringExtra(LandscapeActivity.KEY_DATA), Toast.LENGTH_LONG).show();
}
}
String orientation(){
return getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE ? "Landscape" : "Portrait";
}
}
LandscapeActivity
LandscapeActivity
public class LandscapeActivity extends AppCompatActivity{
public static final String TAG = LandscapeActivity.class.getSimpleName();
public static final String KEY_DATA = "DATA";
static int COUNTER = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(TAG, "onCreate: savedInstanceState=" + savedInstanceState + "orientation=" + (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE ? "Landscape" : "Portrait"));
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent data = new Intent();
COUNTER++;
data.putExtra(KEY_DATA, "Runned " + COUNTER + " times");
setResult(RESULT_OK, data);
finish();
}
});
}
@Override
protected void onResume() {
Log.d(TAG, "onResume: orientation=" + orientation());
super.onResume();
}
@Override
protected void onPause() {
Log.d(TAG, "onPause: orientation=" + orientation());
super.onPause();
}
@Override
protected void onStart() {
Log.d(TAG, "onStart: orientation=" + orientation());
super.onStart();
}
@Override
protected void onStop() {
Log.d(TAG, "onStop: orientation=" + orientation());
super.onStop();
}
@Override
protected void onDestroy() {
Log.d(TAG, "onDestroy: orientation=" + orientation());
super.onDestroy();
}
String orientation(){
return getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE ? "Landscape" : "Portrait";
}
}
build.gradle
build.gradle
android {
compileSdkVersion 26
defaultConfig {
applicationId "android.example.com.orientationtest8_1"
minSdkVersion 15
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
布局 activity_main 文件：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="android.dermalog.com.orientationtest8_1.MainActivity">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
最后一次重复单击按钮获得一个日志：
And last a Log from clicking on Buttons repeatadly:
01-04 15:18:06.744 D/MainActivity: onCreate: savedInstanceState=null
01-04 15:18:06.847 D/MainActivity: onStart: orientation=Portrait
01-04 15:18:06.850 D/MainActivity: onResume: orientation=Portrait
01-04 15:18:14.036 D/MainActivity: onPause: orientation=Portrait
01-04 15:18:14.108 D/LandscapeActivity: onCreate: savedInstanceState=nullorientation=Landscape
01-04 15:18:14.139 D/LandscapeActivity: onStart: orientation=Landscape
01-04 15:18:14.141 D/LandscapeActivity: onResume: orientation=Landscape
01-04 15:18:14.217 D/MainActivity: onStop: orientation=Portrait
01-04 15:18:15.643 D/LandscapeActivity: onPause: orientation=Landscape
01-04 15:18:15.711 D/MainActivity: onActivityResult: orientation=Portrait
01-04 15:18:15.719 D/MainActivity: onStart: orientation=Portrait
01-04 15:18:15.720 D/MainActivity: onResume: orientation=Portrait
01-04 15:18:15.786 D/LandscapeActivity: onStop: orientation=Landscape
01-04 15:18:15.786 D/LandscapeActivity: onDestroy: orientation=Landscape
01-04 15:18:18.036 D/MainActivity: onPause: orientation=Portrait
01-04 15:18:18.097 D/LandscapeActivity: onCreate: savedInstanceState=nullorientation=Landscape
01-04 15:18:18.121 D/LandscapeActivity: onStart: orientation=Landscape
01-04 15:18:18.123 D/LandscapeActivity: onResume: orientation=Landscape
01-04 15:18:18.213 D/MainActivity: onStop: orientation=Portrait
01-04 15:18:19.505 D/LandscapeActivity: onPause: orientation=Landscape
01-04 15:18:19.564 D/MainActivity: onActivityResult: orientation=Portrait
01-04 15:18:19.569 D/MainActivity: onStart: orientation=Portrait
01-04 15:18:19.569 D/MainActivity: onResume: orientation=Portrait
01-04 15:18:19.639 D/LandscapeActivity: onStop: orientation=Landscape
01-04 15:18:19.640 D/LandscapeActivity: onDestroy: orientation=Landscape
01-04 15:18:20.102 D/MainActivity: onPause: orientation=Portrait
01-04 15:18:20.103 D/MainActivity: onStop: orientation=Portrait
01-04 15:18:20.104 D/MainActivity: onDestroy: orientation=Portrait
01-04 15:18:20.123 D/MainActivity: onCreate: savedInstanceState=Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@7ceec3, 2131165191=android.support.v7.widget.Toolbar$SavedState@3c34340, 2131165193=android.view.AbsSavedState$1@7ceec3, 2131165199=android.view.AbsSavedState$1@7ceec3, 2131165219=android.view.AbsSavedState$1@7ceec3, 2131165229=android.view.AbsSavedState$1@7ceec3}}], android:lastAutofillId=1073741823, android:fragments=android.app.FragmentManagerState@c215279}]
01-04 15:18:20.149 D/MainActivity: onStart: orientation=Landscape
01-04 15:18:20.152 D/MainActivity: onResume: orientation=Landscape
01-04 15:18:20.699 D/MainActivity: onPause: orientation=Landscape
01-04 15:18:20.701 D/MainActivity: onStop: orientation=Landscape
01-04 15:18:20.702 D/MainActivity: onDestroy: orientation=Landscape
01-04 15:18:20.718 D/MainActivity: onCreate: savedInstanceState=Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@7ceec3, 2131165191=android.support.v7.widget.Toolbar$SavedState@807af46, 2131165193=android.view.AbsSavedState$1@7ceec3, 2131165199=android.view.AbsSavedState$1@7ceec3, 2131165219=android.view.AbsSavedState$1@7ceec3, 2131165229=android.view.AbsSavedState$1@7ceec3}}], android:lastAutofillId=1073741823, android:fragments=android.app.FragmentManagerState@8d12507}]
01-04 15:18:20.748 D/MainActivity: onStart: orientation=Portrait
01-04 15:18:20.751 D/MainActivity: onResume: orientation=Portrait
推荐答案
此是固定因此，等待下一个版本/补丁。
This bug was fixed. So waiting for next release/patch.
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