Android中的進度條的最基本用法

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"
/>
<ProgressBar
android:id="@+id/firstBar"

android:layout_width="200dip"
android:layout_height="wrap_content"
android:visibility="gone"
/>
<ProgressBar
android:id="@+id/secondBar"

android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
/>
<Button
android:id="@+id/myButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="begin"
/>
</LinearLayout>

ProgressbarActivity.java

package com.progress;

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 {
private ProgressBar firstBar = null;
private ProgressBar secondBar = null;
private Button myButton = null;
private int i = 0;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

firstBar = (ProgressBar) findViewById(R.id.firstBar);
secondBar = (ProgressBar) findViewById(R.id.secondBar);
myButton = (Button) findViewById(R.id.myButton);
myButton.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if( i == 0 ){
firstBar.setVisibility(View.VISIBLE);//可見的狀態。值為0(不用v而用view。 android.view.view)
firstBar.setMax(150);//設置最大值
secondBar.setVisibility(View.VISIBLE);
}else if( i < firstBar.getMax() ){
//設置主進度條的當前值
firstBar.setProgress(i);
//設置第二進度條的當前值
firstBar.setSecondaryProgress(i + 10 );//默認最大寬度是100，則是前進1/10。如果設置的是200.則前進的是1/20
//secondBar.setProgress(i);
}else{
firstBar.setVisibility(View.GONE);//不可見的狀態
secondBar.setVisibility(View.GONE);
}
i = i + 10;
}
});
System.out.println(firstBar.getMax());
}
}