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  • Android学习第九天

    动态注册监听时间变化

    class MainActivity : AppCompatActivity() {
    lateinit var timeChangeReceiver: TimeChangeReceiver
    override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val intentFilter = IntentFilter()
    intentFilter.addAction("android.intent.action.TIME_TICK")
    timeChangeReceiver = TimeChangeReceiver()
    registerReceiver(timeChangeReceiver, intentFilter)
    }
    override fun onDestroy() {
    super.onDestroy()
    unregisterReceiver(timeChangeReceiver)
    }
    inner class TimeChangeReceiver : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
    Toast.makeText(context, "Time has changed", Toast.LENGTH_SHORT).show()
    }
    }
    }

    静态注册的代码示例如下:

    class BootCompleteReceiver : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
    Toast.makeText(context, "Boot Complete", Toast.LENGTH_LONG).show()
    }
    }

     另外,静态的BroadcastReceiver一定要在AndroidManifest.xml文件中注册才可以使用:

    manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.broadcasttest">
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <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">

    <receiver
    android:name=".BootCompleteReceiver"
    android:enabled="true"
    android:exported="true">
    <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
    </receiver>
    </application>
    </manifest>

     

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  • 原文地址:https://www.cnblogs.com/yongyuandishen/p/14867331.html
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