【移动应用开发技术】android中ProgressBar的使用SeekBar的使用和RatingBar的使用

【移动应用开发技术】android中ProgressBar的使用SeekBar的使用和RatingBar的使用

MainActivity.java文件代码packagecom.example.android_pickers2;

importandroid.app.Activity;

importandroid.os.AsyncTask;

importandroid.os.Bundle;

importandroid.view.Menu;

importandroid.view.View;

importandroid.view.View.OnClickListener;

importandroid.widget.Button;

importandroid.widget.ProgressBar;

importandroid.widget.RatingBar;

importandroid.widget.RatingBar.OnRatingBarChangeListener;

importandroid.widget.SeekBar;

importandroid.widget.SeekBar.OnSeekBarChangeListener;

importandroid.widget.Toast;

publicclassMainActivityextendsActivity{

Buttonbutton;

ProgressBarbar;

SeekBarseekBar;

RatingBarratingBar;

@Override

protectedvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

button=(Button)this.findViewById(R.id.button1);

bar=(ProgressBar)this.findViewById(R.gressBar1);

bar.setMax(100);

button.setOnClickListener(newOnClickListener(){

@Override

publicvoidonClick(Viewv){

//TODOAuto-generatedmethodstub

MyTasktask=newMyTask();

task.execute();

}

});

//SeekBar的使用

seekBar=(SeekBar)this.findViewById(R.id.seekBar1);

seekBar.setOnSeekBarChangeListener(newOnSeekBarChangeListener(){

@Override

publicvoidonStopTrackingTouch(SeekBarseekBar){

//TODOAuto-generatedmethodstub

}

@Override

publicvoidonStartTrackingTouch(SeekBarseekBar){

//TODOAuto-generatedmethodstub

}

@Override

publicvoidonProgressChanged(SeekBarseekBar,intprogress,

booleanfromUser){

Toast.makeText(MainActivity.this,"->>"+progress,1).show();

System.out.println("-->"+progress);

//TODOAuto-generatedmethodstub

}

});

//RatingBar的使用

ratingBar=(RatingBar)this.findViewById(R.id.ratingBar1);

ratingBar.setOnRatingBarChangeListener(newOnRatingBarChangeListener(){

@Override

publicvoidonRatingChanged(RatingBarratingBar,floatrating,

booleanfromUser){

//TODOAuto-generatedmethodstub

Toast.makeText(MainActivity.this,"->"+rating,1).show();

}

});

}

/*

*定义一个类继承AsyncTask类，动态改变ProgressBar

*/

classMyTaskextendsAsyncTask<Void,Integer,Void>{

@Override

protectedvoidonProgressUpdate(Integer...values){

//TODOAuto-generatedmethodstub

super.onProgressUpdate(values);

//更新bar

bar.setProgress(values[0]+20);

}

@Override

protectedVoiddoInBackground(Void...params){

//TODOAuto-generatedmethodstub

inti=1;

while(i<=100){

try{

Thread.sleep(100);

}catch(Exceptione){

//TODO:handleexception

e.printStackTrace();

}

publishProgress(i);

i++;

}

returnnull;

}

}

@Override

publicbooleanonCreateOptionsMenu(Menumenu){

//Inflatethemenu;thisaddsitemstotheactionbarifitispresent.

getMenuInflater().inflate(R.menu.main,menu);

returntrue;

}

}activity_main.xml代码:<RelativeLayoutxmlns:android="/apk/res/android"

xmlns:tools="/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context=".MainActivity">

<Button

android:id="@+id/button1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentBottom="true"

android:layout_centerHorizontal="true"

android:layout_marginBottom="71dp"

android:text="下载图片"/>

<ProgressBar

android:id="@+id/progressBar1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentRight="true"/>

<SeekBar

android:id="@+id/seekBar1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_below="@+id/progressBar1"

android:layout_marginTop="28dp"/>

<RatingBar