动态更改应用桌面图标

基础部分：
activity-alias：可以用于创建多个不同的入口
android:enabled：默认为 true，创建多个入口时，先修改为 false。
android:icon：应用图标
android:label：应用名称
android:name：activity-alias 的别名
android:targetActivity：入口目标 Activity
android.intent.action.MAIN：决定最先启动的 Activity
android.intent.category.LAUNCHER：决定应用是否在显示在程序列表中

实际应用：

MainActivity

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btn_change11;
    private Button btn_change22;

    private ComponentName mChange11;
    private ComponentName mChange22;
    private ComponentName mDefault;
    private PackageManager packageManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化布局
        initView();
        //初始化ComponentName 
        initChange();
    }

    private void initChange() {
        mDefault=getComponentName();
        //注意new ComponentName 时填写 activity-alias 的别名时需要加上包名
        mChange11=new ComponentName(getBaseContext(),"com.test.change_icon.change11");
        mChange22=new ComponentName(getBaseContext(),"com.test.change_icon.change22");
        packageManager=getApplicationContext().getPackageManager();
    }

    private void initView() {
        btn_change11=findViewById(R.id.btn_change11);
        btn_change22=findViewById(R.id.btn_change22);
        btn_change11.setOnClickListener(this);
        btn_change22.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.btn_change11:
                changeIcon11();
                break;
            case R.id.btn_change22:
                changeIcon22();
                break;
            default:
                break;
        }
    }

    private void changeIcon22() {
        disableComponent(mDefault);
        disableComponent(mChange11);
        enableComponent(mChange22);
    }

    private void changeIcon11() {
        disableComponent(mDefault);
        disableComponent(mChange22);
        enableComponent(mChange11);
    }

    private void enableComponent(ComponentName componentName) {
        packageManager.setComponentEnabledSetting(componentName,PackageManager.COMPONENT_ENABLED_STATE_ENABLED,PackageManager.DONT_KILL_APP);
    }

    private void disableComponent(ComponentName componentName) {
        packageManager.setComponentEnabledSetting(componentName,PackageManager.COMPONENT_ENABLED_STATE_DISABLED,PackageManager.DONT_KILL_APP);
    }
}

Manifesr.xml

<application
        android:allowBackup="true"
        android:icon="@drawable/s3"
        android:label="@string/app_name"
        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=".default"
            android:enabled="false"
            android:icon="@drawable/s1"
            android:label="@string/app_name"
            android:targetActivity=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <activity-alias
            android:name=".change11"
            android:enabled="false"
            android:icon="@drawable/s1"
            android:label="更换图标1"
            android:targetActivity=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <activity-alias
            android:name=".change22"
            android:enabled="false"
            android:icon="@drawable/s2"
            android:label="更换图标2"
            android:targetActivity=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

    </application>

参考文章 “ 徐宜生 Android群英传 “