舊有app在Android 12 閃退問題& app Splash screens

現在越來越多手機開始轉成android 12. 於是我就把target sdk = 31 試試看.

android { 

    compileSdkVersion 31

    defaultConfig {
        targetSdkVersion 31
    }
}

結果舊有的app都開始發生了閃退現象.

就有使用者跟我反映app當機問題出現.因為這屬於不可歸咎app設計的問題..必須要在android 12的機器上跑才會發生,而且android developer console中Pre-launch report 也沒測試出問題.

但一跑android 12模擬器就會發生當機,所以真的會有問題.

只能說寫app要處理的突發情況有很多,這是其一.

android app發佈控制台好的地方是當你上傳apk時,他都會幫你自動做Pre-launch 測試.

這次android 12會突然當機的問題,理應要先被Pre-launch 被發現才對.

我檢查後才發現,原來連Pre-launch都沒測試到最新的android 12.

他只測試到android 11. 但目前很多新機子已經開始系統更新到android 12去了.這就是問題會發生的原因.

----

error message:

java.lang.IllegalArgumentException: com.mark.electricitybillcalculator: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.

    Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.

Solution:

修正android 12上當機閃退問題(Fixed app crash issue on android 12 devices)

在 app\build.gradle 的 dependencies  增加:

//最新版本可參考此連結

dependencies {
    def work_version = "2.7.0"

    // (Java only)
    implementation "androidx.work:work-runtime:$work_version"

    // Kotlin + coroutines
    implementation "androidx.work:work-runtime-ktx:$work_version"

}

 ----

android 12 new Splash screens feature: app起動畫面

在解上面閃退的問題時,發現android 12多新增了新功能Splash screens:

參考1  , 參考2

用這個後會比較好,有個統一的實作規範,由android控制,將來更新會方便很多.

且admob的open ads也要求要有起動畫面.

----

1.add dependencies: 

dependencies {
...
    implementation 'androidx.core:core-splashscreen:1.0.0-alpha02'
}

2. 在styles.xml新增:

<style name="Theme.App.Starting" parent="Theme.SplashScreen"> 

 <!--// Set the splash screen background, animated icon, and animation duration.--> 

  <item name="windowSplashScreenBackground">@color/colorAccent</item> 

 

<!--// Use windowSplashScreenAnimatedIcon to add either a drawable or an // animated drawable. One of these is required.--> 

 

<item name="windowSplashScreenAnimatedIcon">@mipmap/ic_launcher</item> 

 <item name="windowSplashScreenAnimationDuration">200</item>

 

<!--// Set the theme of the Activity that directly follows your splash screen.--> 

<item name="postSplashScreenTheme">@style/AppTheme</item> 

 </style>

3. In the manifest, replace the theme:

<manifest>
<application android:theme="@style/Theme.App.Starting">
<!-- or -->
<activity android:theme="@style/Theme.App.Starting">

...

4.在 起動 Activity 的 setContentView()之前一行新增setContentView()..

public class SplashScreenSampleActivity extends Activity {
@Override

    protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         // Handle the splash screen transition.
         SplashScreen splashScreen = SplashScreen.installSplashScreen(this);
         setContentView(R.layout.main_activity);
    }
}

非常簡易就可設定好SplashScreen,不用寫一大堆程式碼.