四大组件之Activity

Activity启动

隐藏app launcher图标并隐式启动

• 入口activity声明为接收隐式intent方式启动，不显示启动图标

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android">  
    <application  
        android:name=".App"  
        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/Theme.Demo">  
        <activity  
            android:name=".MainActivity"  
            android:exported="true">  
            <intent-filter>  
                <action android:name="android.intent.action.MAIN" />  
                <category android:name="android.intent.category.DEFAULT" />  
                <category android:name="android.intent.category.LAUNCHER" />  

                <!-- 关键代码，入口activity声明为接收隐式intent方式启动，不显示启动图标 --> 
                <data android:host="DemoActivity" android:scheme="com.dcxing.demo"/>  
            </intent-filter>  
        </activity>  
    </application>
</manifest>  
  
// 启动  
val data = Uri.parse("com.dcxing.demo://DemoActivity")  
val intent = intent()  
intent.data = data  
try {  
    startActivity(intent)  
} catch (e: Exception) {  
    LogTool.e("Exception: ${e.message}")  
}  

最近任务列表窗口不显示app

• activity增加属性多任务列表隐藏该应用

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android">  
    <application  
        android:name=".App"  
        android:supportsRtl="true"  
        android:theme="@style/Theme.Demo">  
        <activity  
            android:name=".MainActivity"  
            <!-- 关键代码，增加该属性多任务列表隐藏该应用 -->  
            android:excludeFromRecents="true"  
            android:exported="true">
            
            <intent-filter>  
                ...  
            </intent-filter>  
        </activity>  
    </application>  
</manifest>  

退出app

1. 关闭所有打开的activity
2. 调用exitProcess(0) 或 Process.killProcess(Process.myPid())

方式一

import android.app.Activity  
  
object ActivityTool {  
    @JvmStatic  
    private val activityList = arrayListOf<Activity>()  

    fun addActivity(activity: Activity) {  
        activityList.add(activity)  
    }  

    fun removeActivity(activity: Activity) {  
        activityList.remove(activity)  
    }  

    fun finishAll() {  
        if (activityList.isEmpty()) {  
            return  
        }  
        for (activity in activityList) {  
            if (!activity.isFinishing) {  
                activity.finish()  
            }  
        }  
        activityList.clear()  
    }  
}  

方式二

• finishAffinity关闭所有activity

// Activity.class  
finishAffinity()  
// Fragment.class  
activity.finishAffinity()