ProgressBar进度条控件

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PregressBar可以用来设置进度，可以设置为圆圈形或者条形，案例图如下
这里写图片描述

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <!-- 设置控件样式 -->    <ProgressBar         style="?android:attr/progressBarStyleSmall"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        />      <ProgressBar         style="?android:attr/progressBarStyleLarge"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        />       <ProgressBar         style="?android:attr/progressBarStyleHorizontal"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:progress="30"        />       <ProgressBar            android:id="@+id/progress"        style="?android:attr/progressBarStyleHorizontal"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:secondaryProgress="60"        android:layout_marginTop="40dip"        android:progress="30"        />       <LinearLayout            android:layout_width="wrap_content"           android:layout_height="wrap_content"           android:orientation="horizontal"           >           <Button                android:id="@+id/btn_add"               android:layout_width="wrap_content"               android:layout_height="wrap_content"               android:text="增加"               />            <Button                 android:id="@+id/btn_cutback"               android:layout_width="wrap_content"               android:layout_height="wrap_content"               android:text="减少"               />       </LinearLayout></LinearLayout>

activity代码

package progress.bar;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ProgressBar;public class ProgressBarActivity extends Activity implements OnClickListener {    private Button btn_add;    private Button btn_cutback;    private ProgressBar progress;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        btn_add=(Button)findViewById(R.id.btn_add);        btn_cutback=(Button)findViewById(R.id.btn_cutback);        progress=(ProgressBar)findViewById(R.id.progress);        btn_add.setOnClickListener(this);        btn_cutback.setOnClickListener(this);    }    @Override    public void onClick(View v) {        // TODO Auto-generated method stub        switch(v.getId()){        case R.id.btn_add:            //拿到当前进度            int currentProgress= progress.getProgress();            int prog = (int)( currentProgress*1.2);            progress.setProgress(prog);            break;        case R.id.btn_cutback:            //拿到当前进度            int currentProgress2= progress.getProgress();            int prog2 = (int)( currentProgress2*0.8);            progress.setProgress(prog2);        }    }}

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