android通知栏进度条
16lz
2021-12-04
项目中需要用到通知栏进度条,查找了好多资料、链接如下:
- Android 为Notification加上一个进度条
- Android实现Service后台下载Notification进度条
- Notification使用详解之三:通过服务更新进度通知&在Activity中监听服务进度
- android service startService bindService
- Android中BindService方式使用的理解
- [Android 机制] 大家帮忙看一下这个BUG.
- Android 的service的定义可以 作为内部类使用吗?
我先简后难写了两种实现,第一个没有使用服务,activity转向后台进度条消失;另一个使用服务,activity转向后台进度条仍然继续。
以下是第一个实现:
主界面布局代码 notify.xml
<?xml version="1.0" encoding="utf-8"?>
通知栏内容布局代码 notify_content.xml <?xml version="1.0" encoding="utf-8"?>
AndroidManifest.xml 代码添加如下:
主程序NotificationActivity1.java代码如下: package com.zhang.new_test.notify;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;import android.widget.Toast;import com.zhang.new_test.R;public class NotificationActivity1 extends Activity implements OnClickListener { private static final int NOTIFICATION_ID = 0x12; private Notification notification = null; private NotificationManager manager = null; private int _progress = 0; private boolean isStop = false; @Override protected void onPause() { isStop = false; manager.cancel(NOTIFICATION_ID); super.onPause(); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.notify); Button btn = (Button) findViewById(R.id.button1); btn.setOnClickListener(this); notification = new Notification(R.drawable.sg, "带进条的提醒", System.currentTimeMillis()); notification.contentView = new RemoteViews(getApplication().getPackageName(), R.layout.notify_content); notification.contentView.setProgressBar(R.id.progressBar1, 100, 0, false); notification.contentView.setTextViewText(R.id.textView1, "进度" + _progress + "%"); notification.contentIntent = PendingIntent.getActivity(this, 0,new Intent(this, NotificationActivity1.class), 0); manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); } @Override public void onClick(View v) { isStop = true; manager.notify(NOTIFICATION_ID, notification); new ProgressThread().start(); } private class ProgressThread extends Thread { @Override public void run() { while (isStop) { _progress += 10; Message msg = handler.obtainMessage(); msg.arg1 = _progress; msg.sendToTarget(); try { Thread.sleep(500); } catch (InterruptedException e) { e.printStackTrace(); } } } } public Handler handler = new Handler() { @Override public void handleMessage(Message msg) { notification.contentView.setProgressBar(R.id.progressBar1, 100, msg.arg1, false); notification.contentView.setTextViewText(R.id.textView1, "进度" + msg.arg1 + "%"); manager.notify(NOTIFICATION_ID, notification); if (msg.arg1 == 100) { _progress = 0; manager.cancel(NOTIFICATION_ID); isStop = false; Toast.makeText(NotificationActivity1.this, "下载完毕", 1000).show(); } } };}
以下是第二个实现:
主界面布局代码 notify.xml和通知栏内容布局代码 notify_content.xml同上一个实现
AndroidManifest.xml 代码添加如下:
主程序NotificationActivity2.java代码如下: package com.zhang.new_test.notify;import android.app.Activity;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.app.Service;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.os.Binder;import android.os.Bundle;import android.os.Handler;import android.os.IBinder;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.RemoteViews;import android.widget.Toast;import com.zhang.new_test.R;public class NotificationActivity2 extends Activity implements OnClickListener { private DownLoadService downLoadService; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.notify); Button btn = (Button) findViewById(R.id.button1); btn.setOnClickListener(this); } @Override protected void onResume() { super.onResume(); Intent serviceIntent = new Intent(this,DownLoadService.class); startService(serviceIntent);// bindService(serviceIntent, serviceConnection, Context.BIND_AUTO_CREATE); } @Override protected void onPause() { super.onPause(); unbindService(serviceConnection); } @Override public void onClick(View v) { downLoadService.startDownLoad(); } private ServiceConnection serviceConnection = new ServiceConnection() {@Overridepublic void onServiceConnected(ComponentName name, IBinder service){downLoadService = ((DownLoadService.DownLoadServiceBinder) service).getService();Toast.makeText(NotificationActivity2.this, "Service Connected.", Toast.LENGTH_LONG).show();}@Overridepublic void onServiceDisconnected(ComponentName name) {}};public static class DownLoadService extends Service { private static final int NOTIFICATION_ID = 0x12; private Notification notification = null; private NotificationManager manager = null; private int _progress = 0; private boolean isStop = false; private Binder serviceBinder = new DownLoadServiceBinder();@Overridepublic void onCreate() {super.onCreate(); notification = new Notification(R.drawable.sg, "带进条的提醒", System.currentTimeMillis()); notification.contentView = new RemoteViews(getApplication().getPackageName(), R.layout.notify_content); notification.contentView.setProgressBar(R.id.progressBar1, 100, 0, false); notification.contentView.setTextViewText(R.id.textView1, "进度" + _progress + "%"); notification.contentIntent = PendingIntent.getActivity(this, 0,new Intent(this, NotificationActivity1.class), 0); manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);}@Overridepublic IBinder onBind(Intent intent) {return serviceBinder;}@Overridepublic void onDestroy() { isStop = false; manager.cancel(NOTIFICATION_ID); super.onDestroy();}public void startDownLoad() { isStop = true; manager.notify(NOTIFICATION_ID, notification);new ProgressThread().start();}public class DownLoadServiceBinder extends Binder {public DownLoadService getService() {return DownLoadService.this;}} private class ProgressThread extends Thread { @Override public void run() { while (isStop) { _progress += 10; Message msg = handler.obtainMessage(); msg.arg1 = _progress; msg.sendToTarget(); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } } public Handler handler = new Handler() { @Override public void handleMessage(Message msg) { notification.contentView.setProgressBar(R.id.progressBar1, 100, msg.arg1, false); notification.contentView.setTextViewText(R.id.textView1, "进度" + msg.arg1 + "%"); manager.notify(NOTIFICATION_ID, notification); if (msg.arg1 == 100) { _progress = 0; manager.cancel(NOTIFICATION_ID); isStop = false; Toast.makeText(DownLoadService.this, "下载完毕", 1000).show(); } } };}}
效果我就不贴图了,前面提到的链接中有,效果差不多。 接下来分析一下代码,第二个和第一个最大区别是引入了service,这样可以支持后台运行,所以第二个更有实用性。但是刚开始写代码,不应该引入服务,那样会带来过多的复杂度,出bug时很难调试,写完第一个在重构引入服务就没那么麻烦了,大部分代码可以复用的。
主要知识点就是Notification和bindService的使用,我主要遇到两个悲剧,和大家分享一下:
- 忘了unbindService,抛了一个不知道的异常,链接6解决了
- .notify.NotificationActivity2$DownLoadService 我写成了 .notify.NotificationActivity2.DownLoadService,链接7解决了,这个花了半天时间,我就不相信这个会错,主要是因为写代码时new 静态内部类时都是用 . 啊,忘了配置是用的反射,所以应该用 $ 啊,主要是以前没写过静态内部类的反射,记住教训了。
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