android中ProgressBar的使用SeekBar的使用和RatingBar的使用

MainActivity.java文件代码

package com.example.android_pickers2;import android.app.Activity;import android.os.AsyncTask;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ProgressBar;import android.widget.RatingBar;import android.widget.RatingBar.OnRatingBarChangeListener;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.Toast;public class MainActivity extends Activity {    Button button ;    ProgressBar bar;    SeekBar seekBar;    RatingBar ratingBar;                 @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button) this.findViewById(R.id.button1);        bar = (ProgressBar) this.findViewById(R.id.progressBar1);        bar.setMax(100);        button.setOnClickListener(new OnClickListener() {                                 @Override            public void onClick(View v) {                // TODO Auto-generated method stub                MyTask task = new MyTask();                task.execute();            }        });        //SeekBar的使用        seekBar = (SeekBar) this.findViewById(R.id.seekBar1);        seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {                                 @Override            public void onStopTrackingTouch(SeekBar seekBar) {                // TODO Auto-generated method stub            }                                 @Override            public void onStartTrackingTouch(SeekBar seekBar) {                // TODO Auto-generated method stub                                     }                                 @Override            public void onProgressChanged(SeekBar seekBar, int progress,                    boolean fromUser) {                Toast.makeText(MainActivity.this, "->>"+progress, 1).show();                System.out.println("-->"+progress);                // TODO Auto-generated method stub                                     }        });        //RatingBar的使用        ratingBar = (RatingBar) this.findViewById(R.id.ratingBar1);        ratingBar.setOnRatingBarChangeListener(new OnRatingBarChangeListener() {                                 @Override            public void onRatingChanged(RatingBar ratingBar, float rating,                    boolean fromUser) {                // TODO Auto-generated method stub                Toast.makeText(MainActivity.this, "->"+rating, 1).show();                                     }        });    }                 /*     * 定义一个类继承AsyncTask类，动态改变ProgressBar     */    class MyTask extends AsyncTask<Void, Integer, Void>{        @Override        protected void onProgressUpdate(Integer... values) {            // TODO Auto-generated method stub            super.onProgressUpdate(values);            //更新bar            bar.setProgress(values[0]+20);        }                         @Override        protected Void doInBackground(Void... params) {            // TODO Auto-generated method stub                                 int i=1;            while(i<=100){                try {                    Thread.sleep(100);                } catch (Exception e) {                    // TODO: handle exception                    e.printStackTrace();                }                publishProgress(i);                i++;            }            return null;        }                     }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

activity_main.xml代码:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/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"        style="?android:attr/progressBarStyleHorizontal"        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        android:id="@+id/ratingBar1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/seekBar1"        android:layout_marginTop="30dp" /></RelativeLayout>

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