进度条:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ProgressBar                                                 默认进度条
        android:id="@+id/pb1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <ProgressBar                                                 
        android:id="@+id/pb2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:max="100"                                  最大值是100
        android:progress="30"/>                           初始值是30
    <Button 
        android:id="@+id/btnDownload"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Download File"/>
</LinearLayout>
package com.sxt.day03_07;

import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ProgressBar;

public class MainActivity extends Activity {
    ProgressBar mProgressBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        setListener();
    }
    private void setListener() {
        findViewById(R.id.btnDownload).setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread(){//开出一个线程,则进度条工作的时候,不影响主线程的工作,如果不用多线程则进度条工作的时候再点击别的地方就会有问题
                    public void run() {
                        for(int i=1;i<=100;i++){
                            mProgressBar.setProgress(i);
                            SystemClock.sleep(20);//SystemClock.sleep(20)是安卓里的暂停,进度条变化一次使当前线程休眠10毫秒
                        }
                    };
                }.start();
            }
        });
    }
    private void initView() {
        mProgressBar=(ProgressBar) findViewById(R.id.pb2);
        mProgressBar.setProgress(0);
    }

}

拖动条:

 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <SeekBar 
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="50"/>
</RelativeLayout>
package com.sxt.day03_08;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity implements OnSeekBarChangeListener{
    int mProgress;//代表SeekBar当前的progress值
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        SeekBar seekBar=(SeekBar) findViewById(R.id.seekBar);
        seekBar.setOnSeekBarChangeListener(this);//给SeekBar添加拖动监听器
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {//拖动中一直调用这个函数,fromUser为true表示润许触摸操作,progress表示当前拖动值,
        mProgress=progress;
        Log.i("main","progress="+progress);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {//开始拖动函数
        Log.i("main","开始拖动seekbar");
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {//结束拖动函数
        Log.i("main","结束拖动seekbar");
    }

}