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法律研究如何在 Android 中收到通知时播放自定义声音？
此示例演示了如何在 Android 中收到通知时播放自定义声音。
步骤 1 - 在 Android Studio 中创建一个新项目，转到文件 ⇒ 新建项目，并填写所有必需的详细信息以创建新项目。
步骤 2 - 将以下代码添加到 res/layout/activity_main.xml 中。
<? xml version = "1.0" encoding = "utf-8" ?> <RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" android :layout_width = "match_parent" android :layout_height = "match_parent" tools :context = ".MainActivity" > <Button android :onClick = "setRingtone" android :layout_width = "wrap_content" android :layout_height = "wrap_content" android :layout_centerHorizontal = "true" android :layout_marginTop = "32dp" android :text = "set ringtone" /> <Button android :onClick = "createNotification" android :layout_width = "match_parent" android :layout_height = "wrap_content" android :layout_centerInParent = "true" android :layout_margin = "16dp" android :text = "Create notification" /> </RelativeLayout>
步骤 3 - 将以下代码添加到 src/MainActivity 中。
package app.tutorialspoint.com.notifyme ;
import android.app.Activity ;
import android.app.NotificationChannel ;
import android.app.NotificationManager ;
import android.content.Intent ;
import android.media.RingtoneManager ;
import android.net.Uri ;
import android.os.Bundle ;
import android.support.annotation. Nullable ;
import android.support.v4.app.NotificationCompat ;
import android.support.v7.app.AppCompatActivity ;
import android.view.View ;
public class MainActivity extends AppCompatActivity {
public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
private final static String default_notification_channel_id = "default" ;
String chosenRingtone ;
@Override
protected void onCreate (Bundle savedInstanceState) {
super .onCreate(savedInstanceState) ;
setContentView(R.layout. activity_main ) ;
onNewIntent(getIntent()) ;
}
public void setRingtone (View view) {
Intent intent = new Intent(RingtoneManager. ACTION_RINGTONE_PICKER ) ;
intent.putExtra(RingtoneManager. EXTRA_RINGTONE_TYPE , RingtoneManager. TYPE_NOTIFICATION ) ;
intent.putExtra(RingtoneManager. EXTRA_RINGTONE_TITLE , "Select Tone" ) ;
intent.putExtra(RingtoneManager. EXTRA_RINGTONE_EXISTING_URI , (Uri) null ) ;
this .startActivityForResult(intent , 5 ) ;
}
public void createNotification (View view) {
NotificationManager mNotificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE ) ;
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity. this, default_notification_channel_id ) ;
mBuilder.setContentTitle( "Notify Me" ) ;
mBuilder.setContentText( "Something important!" ) ;
mBuilder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
mBuilder.setAutoCancel( true ) ;
if (android.os.Build.VERSION. SDK_INT >= android.os.Build.VERSION_CODES. O ) {
int importance = NotificationManager. IMPORTANCE_HIGH ;
NotificationChannel notificationChannel = new NotificationChannel( NOTIFICATION_CHANNEL_ID , "NOTIFICATION_CHANNEL_NAME" , importance) ;
mBuilder.setChannelId( NOTIFICATION_CHANNEL_ID ) ;
assert mNotificationManager != null;
mNotificationManager.createNotificationChannel(notificationChannel) ;
}
assert mNotificationManager != null;
mNotificationManager.notify(( int ) System. currentTimeMillis () , mBuilder.build()) ;
}
@Override
protected void onActivityResult ( int requestCode , int resultCode , @Nullable Intent data) {
super .onActivityResult(requestCode , resultCode , data) ;
if (resultCode == Activity. RESULT_OK && requestCode == 5 ) {
Uri uri = data.getParcelableExtra(RingtoneManager. EXTRA_RINGTONE_PICKED_URI ) ;
if (uri != null ) {
this . chosenRingtone = uri.toString() ;
} else {
this . chosenRingtone = null;
}
}
}
}步骤 4 - 将以下代码添加到 AndroidManifest.xml 中。
<? xml version = "1.0" encoding = "utf-8" ?> <manifest xmlns: android = "http://schemas.android.com/apk/res/android" package = "app.tutorialspoint.com.notifyme" > <uses-permission android :name = "android.permission.VIBRATE" /> <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> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际 Android 移动设备连接到您的计算机。要从 Android Studio 运行应用程序，请打开您的项目中的一个活动文件，然后单击工具栏中的运行 
图标。选择您的移动设备作为选项，然后检查您的移动设备，它将显示您的默认屏幕 -
点击 这里 下载项目代码
更新于: 2019-07-30
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