Android复习(十)

Android常用控件（三）

进度条

ProgressBarActivity

package org.wp.activity;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ProgressBar;public class ProgressBarActivity extends Activity {private ProgressBar firstBar;private ProgressBar secondBar;private Button myButton;private int i;@Overridepublic 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 View.OnClickListener() {@Overridepublic void onClick(View arg0) {if (i == 0) {// 设置进度条处于可见的状态firstBar.setVisibility(View.VISIBLE);secondBar.setVisibility(View.VISIBLE);// 设置进度条的最大值firstBar.setMax(200);} else if (i < firstBar.getMax()) {// 设置主进度条的当前值firstBar.setProgress(i);// 设置第二进度条的当前值firstBar.setSecondaryProgress(i + 10);// 因为默认的进度条无法显示进行的状态// secondBar.setProgress(i);} else {// 设置进度条处于不可见状态firstBar.setVisibility(View.GONE);secondBar.setVisibility(View.GONE);}i = i + 10;}});}}

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"    /><!-- 横向进度条android:layout_width进度条长度android:visibility是否可见--><ProgressBarandroid:id="@+id/firstBar"style="?android:attr/progressBarStyleHorizontal"android:layout_width="200dp"android:layout_height="wrap_content"android:visibility="gone"/><!-- 圆圈进度条 --><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"android:text="Begin"/></LinearLayout>

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