android通知栏进度条

来源：互联网发布：用mui写APP数据怎么写编辑：程序博客网时间：2024/04/30 09:08

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"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="开始" /></LinearLayout>

通知栏内容布局代码 notify_content.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <ProgressBar        android:id="@+id/progressBar1"        style="?android:attr/progressBarStyleHorizontal"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true"        android:layout_marginTop="14dp"        android:layout_toRightOf="@+id/imageView1" />    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_below="@+id/progressBar1"        android:layout_marginRight="26dp"/>    <ImageView        android:id="@+id/imageView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBottom="@+id/textView1"        android:layout_alignParentLeft="true"        android:src="@drawable/ic_launcher" /></RelativeLayout>

AndroidManifest.xml 代码添加如下：

        <activity            android:label="@string/app_name"            android:name=".notify.NotificationActivity1" >            <intent-filter >                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>

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：

        <activity            android:label="@string/app_name"            android:name=".notify.NotificationActivity2" >            <intent-filter >                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>                <service android:name=".notify.NotificationActivity2$DownLoadService"/>

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。

希望这篇博文对大家有帮助。