Android kotlin 点击App 调节系统音量

看效果图




1.入口
<application
    android:allowBackup="true"
    android:icon="@mipmap/timg"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/timg"
    android:supportsRtl="true"
    android:excludeFromRecents="true"
    android:theme="@android:style/Theme.Translucent.NoTitleBar">//设置透明背景

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

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

2.布局

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@null"
    tools:context=".MainActivity">

   <TextView
       android:id="@+id/text"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       app:layout_constraintStart_toStartOf="parent"
       app:layout_constraintTop_toTopOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

3.界面
class MainActivity : Activity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        OnVolumeAddKey()
    }

    fun OnVolumeAddKey() {
        try {
            val keyCommand = "input keyevent " + KeyEvent.KEYCODE_VOLUME_UP
            val runtime = Runtime.getRuntime()
            val proc = runtime.exec(keyCommand)
        } catch (e: IOException) {
            e.printStackTrace()
        }
        text.postDelayed(Runnable {
            finish()
        }, 1000)
    }

    override fun onDestroy() {
        super.onDestroy()
        finish()
    }
}