android文件下载进度

1. 谁知道怎样在安卓手机通知栏里显示下载进度条啊

通知栏显示所用到的布局文件content_view.xml

主运行类：

packageyyy.testandroid4;

importjava.util.Timer;

importjava.util.TimerTask;

importandroid.app.Activity;

importandroid.app.AlertDialog.Builder;

importandroid.app.Notification;

importandroid.app.NotificationManager;

importandroid.app.PendingIntent;

importandroid.content.DialogInterface;

importandroid.content.Intent;

importandroid.content.pm.PackageManager.NameNotFoundException;

importandroid.os.Bundle;

importandroid.os.Handler;

importandroid.os.Message;

importandroid.view.View;

importandroid.view.View.OnClickListener;

importandroid.widget.Button;

importandroid.widget.RemoteViews;

importandroid.widget.Toast;

{

privateHandlerhandler=newHandler(){

@Override

publicvoidhandleMessage(Messagemsg){

//TODOAuto-generatedmethodstub

super.handleMessage(msg);

switch(msg.what){

case0:

notif.contentView.setTextViewText(R.id.content_view_text1,len+"%");

notif.contentView.setProgressBar(R.id.content_view_progress,100,len,false);

manager.notify(0,notif);

break;

case1:

Toast.makeText(TestAndroid4Activity.this,"下载完成",0).show();

break;

default:

break;

}

}

};

privateButtonupdate,cancel;

privateintlocalVersion,serverVersion;

privateintlen;

;

privateNotificationnotif;

/**.*/

@Override

publicvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

update=(Button)findViewById(R.id.update);

update.setOnClickListener(newOnClickListener(){

@Override

publicvoidonClick(Viewarg0){

//TODOAuto-generatedmethodstub

//点击通知栏后打开的activity

Intentintent=newIntent(TestAndroid4Activity.this,OtherActivity.class);

PendingIntentpIntent=PendingIntent.getActivity(TestAndroid4Activity.this,0,intent,0);

manager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);

notif=newNotification();

notif.icon=R.drawable.logo;

notif.tickerText="新通知";

//通知栏显示所用到的布局文件

notif.contentView=newRemoteViews(getPackageName(),R.layout.content_view);

notif.contentIntent=pIntent;

manager.notify(0,notif);

newDownLoadThread().start();

}

});

}

}

{

privateTimertimer=newTimer();

@Override

publicvoidrun(){

//TODOAuto-generatedmethodstub

super.run();

timer.schele(newTimerTask(){

@Override

publicvoidrun(){

//TODOAuto-generatedmethodstub

Messagemsg=newMessage();

msg.what=0;

msg.obj=len;

handler.sendMessage(msg);

if(len==100){

timer.cancel();

handler.sendEmptyMessage(1);

}

}

},0,1000);

len=0;

try{

while(len<100){

len++;

Thread.sleep(1000);

}

}catch(InterruptedExceptione){

//TODOAuto-generatedcatchblock

e.printStackTrace();

}

}

}

}

2. android studio 一打开项目下方就又有个下载进度条，每次打开都要下载，怎么回事啊

如果是第一次导入的项目，她会去网络仓库下载你build.gride里导入的包比如http请求的，或者第三方组件的包。会有各种类似下载的进度条。之后打开都是检查版本什么的，还有初始化项目，也会耗费一定的时间