Notification中显示ProgressBar组件

最新推荐文章于 2021-06-02 15:46:48 发布

原创最新推荐文章于 2021-06-02 15:46:48 发布 · 9.7k 阅读

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#android #layout #button #多线程 #download #encoding

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本文介绍如何在安卓应用的通知栏中显示带有进度条的通知，包括定义XML布局文件、使用RemoteViews更新进度条状态及通知内容的方法。

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1. 在Notification中显示ProgressBar，效果图：

Notification中显示ProgressBar组件

2. 实现步骤：

（1）在res/layout/目录中定义notification.xml文件，内容如下：<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "fill_parent" android:layout_height = "fill_parent" android:gravity = "center_vertical" > <ImageView android:id = "@+id/image" android:layout_width = "wrap_content" android:layout_height = "fill_parent" /> <ProgressBar android:id = "@+id/progressBar" android:layout_width = "180dip" android:layout_height = "wrap_content" style = "?android:attr/progressBarStyleHorizontal" android:layout_gravity = "center_vertical" /> <TextView android:id = "@+id/tip" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:textSize = "16px" android:textColor = "#FF0000" /> </LinearLayout>

（2）主Activity实现：package com.focus.notification; import android.app.Activity; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.RemoteViews; public class NotificationActivity extends Activity { private NotificationManager mNotificationManager; private RemoteViews mRemoteViews; private Intent mIntent; private PendingIntent mPendingIntent; private int mProgress = 0; private Notification notification = new Notification(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /** * Activity主布局，布局中存在一个Button，单击Button后启动多线程并向StatusBar发送Notification提醒。 */ setContentView(R.layout.main); /** * 获取Notification管理器。 */ mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); /** * 利用notification.xml文件创建RemoteView对象。 */ mRemoteViews = new RemoteViews(getPackageName(), R.layout.notification); /** * 单击Notification时发出的Intent消息。 */ mIntent = new Intent(NotificationActivity.this, 自定义Activity.class); mPendingIntent = PendingIntent.getActivity(NotificationActivity.this, 0, mIntent, 0); /** * 获取Button对象，设置单击事件，单击后启动多线程向StatusBar发送Notification提醒。 */ Button sendNotification = (Button) findViewById(R.id.sendNotification); sendNotification.setOnClickListener(new OnClickListener() { public void onClick(View view) { /** * 设置Notification的Icon图标。 */ notification.icon = R.drawable.icon; mRemoteViews.setImageViewResource(R.id.image, R.drawable.icon); /** * 启动多线程更新Notification提醒。 */ new Thread(new Runnable() { public void run() { for (int i = 0; i < 20; i++) { mProgress = (i + 1) * 5; try { if (i < 19) { Thread.sleep(1000); } else { Thread.currentThread().interrupt(); } } catch (InterruptedException e) { e.printStackTrace(); } Message message = new Message(); mHandler.sendMessage(message); } } }).start(); } }); } private Handler mHandler = new Handler() { public void handleMessage(Message message) { /** * 设置RemoteView组件中进度条的进度值。 */ mRemoteViews.setProgressBar(R.id.progressBar, 100, mProgress, false); mRemoteViews.setTextViewText(R.id.tip, "Download:" + mProgress + "%"); /** * 给Notification设置布局。 */ notification.contentView = mRemoteViews; /** * 给Notification设置Intent，单击Notification会发出这个Intent。 */ notification.contentIntent = mPendingIntent; /** * 发送Notification提醒。 */ mNotificationManager.notify(0, notification); super.handleMessage(message); } }; }