Android(安卓)ProgressBar 进度条

截图如下：

package com.coolbi;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 ProgressBarTest extends Activity {    /** Called when the activity is first created. */private ProgressBar firstBar = null;private ProgressBar secondBar = null;private Button myButton = null;int i = 0 ;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                firstBar = (ProgressBar)findViewById(R.id.firstBar);        secondBar = (ProgressBar)this.findViewById(R.id.secondBar);                myButton = (Button)this.findViewById(R.id.myButton);        myButton.setText("ProgressBar Test");                myButton.setOnClickListener(new MyButtonClickListener());            }        class MyButtonClickListener implements OnClickListener    {@Overridepublic void onClick(View v){if(i==0){firstBar.setVisibility(View.VISIBLE);secondBar.setVisibility(View.VISIBLE);i += 10;}else if(i>0 && i<100){firstBar.setProgress(i);firstBar.setSecondaryProgress(i+10);secondBar.setProgress(i);i += 10;}else{firstBar.setVisibility(View.GONE);secondBar.setVisibility(View.GONE);firstBar.setProgress(0);firstBar.setSecondaryProgress(0);secondBar.setProgress(0);i = 0;}}        }}

2.main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    />    <ProgressBarandroid:id="@+id/firstBar"style="?android:attr/progressBarStyleHorizontal"android:layout_width="fill_parent"android:layout_height="wrap_content"android:visibility="gone"/><ProgressBarandroid:id="@+id/secondBar"style="?/android:attr/progressBarStyle"android:layout_width="wrap_content"android:layout_height="wrap_content"android:visibility="gone"/><Buttonandroid:id="@+id/myButton"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout>

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