动态更新Icon

动态更改图标主要用到activity-alias和PackageManager的setComponentEnabledSetting方法。具体步骤如下：

1、在AndroidManifest.xml中增加以下声明:

<activity-alias
        android:name=".alias"
        android:enabled="false"
        android:icon="@mipmap/icon"
        android:label="Alias"
        android:targetActivity=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

完整文件如下:

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

    <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">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity-alias
            android:name=".alias"
            android:enabled="false"
            android:icon="@mipmap/icon"
            android:label="Alias"
            android:targetActivity=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

2、切换图标

getPackageManager().setComponentEnabledSetting(getComponentName(),
            PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
            PackageManager.DONT_KILL_APP);
getPackageManager().setComponentEnabledSetting(new ComponentName(this,
                    getPackageName() + ".alias"),
            PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
            0);

setComponentEnabledSetting方法的最后一个参数，PackageManager.DONT_KILL_APP表示不关闭App，0表示关闭App刷新图标。

完整文件如下:

package com.wangyz.dynamicicon;

import android.content.ComponentName;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

    public void changeIcon(View view) {
        getPackageManager().setComponentEnabledSetting(getComponentName(),
                PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP);
        getPackageManager().setComponentEnabledSetting(new ComponentName(this,
                        getPackageName() + ".MainActivity"),
                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
                0);
    }

    public void changeIconAlias(View view) {
        getPackageManager().setComponentEnabledSetting(getComponentName(),
                PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP);
        getPackageManager().setComponentEnabledSetting(new ComponentName(this,
                        getPackageName() + ".alias"),
                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
                0);
    }
}

源码地址:https://github.com/milovetingting/Samples/tree/master/DynamicIcon