Android App更改应用的图标的实现方法

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

  <application
    android:name=".ApplicationContext"
    android:allowBackup="false"
    android:icon="@drawable/app_icon"
    android:label="@string/app_name"
    android:theme="@style/BaseTheme">

    ....
    .....

  </application>
</manifest>

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

  <application
    android:name=".core.application.ApplicationContext"
    android:allowBackup="false"
    android:icon="@drawable/app_icon"
    android:label="@string/app_name"
    android:theme="@style/BaseTheme">

    ....

    <activity
      android:name=".activity.MainActivity"
      android:icon="@drawable/new_app_icon"
      android:launchMode="singleTop"
      android:screenOrientation="portrait"
      android:theme="@style/BaseTheme.SplashScreen"
      android:configChanges="keyboardHidden|orientation|screenSize">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>


    .....

  </application>
</manifest>