Question

我一直在Android Q上测试我的应用程序，发现奇怪的行为使应用程序无法运行。然后，我可以用最少的代码在一个新项目中重现它。

问题在于活动处于重新创建的无限循环中（一遍又一遍地调用onCreate）。这是通过在运行时请求权限来触发的。即使已经授予权限并且没有显示请求UI，也会发生这种情况。

这仅发生在Q上，而不发生在Pie或Oreo或棉花糖上。我不知道我的代码是否做得很奇怪，还是当前Q仿真器映像中的OS错误。你怎么看？在不触发此错误的情况下，我还能如何请求启动应用程序的权限？

AndroidManifest.xml：

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

    <uses-feature
        android:name="android.hardware.location"
        android:required="false" />

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

    <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"
        tools:ignore="GoogleAppIndexingWarning">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

build.gradle：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.a.myapplication"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

MainActivity.java：

package com.a.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import android.Manifest;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Log.e("Activity", "Activity created!");

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                requestPermissionsOnStartup();
            }
        }, 1500);
    }

    private void requestPermissionsOnStartup() {
            ActivityCompat.requestPermissions(this,
                new String[]{
                        Manifest.permission.ACCESS_FINE_LOCATION,
                },
                25547);
    }
}

这是启动此应用程序后在logcat中看到的内容：

2019-07-09 11:10:03.234 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:03.326 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:03.444 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:03.577 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:03.728 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:03.864 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:03.987 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:04.127 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:04.254 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:04.371 7454-7454/com.a.myapplication E/Activity: Activity created!
2019-07-09 11:10:04.507 7454-7454/com.a.myapplication E/Activity: Activity created!

这些是我确切的模拟器设置：

权限请求导致Android Q模拟器上的活动重新生成

0 个答案: