【Android开发学习27】界面控件之进度条(ProgressBar)

一、基础知识:

1.ProgressBar在界面文件XML中的布局:

<progressBar android:id="@+id/progressbar_updown"        android:layout_width="200dp"         android:layout_height="wrap_content"        style="?android:attr/progressBarStyleHorizontal"        android:layout_gravity="center_vertical"         android:max="100"        android:progress="50"        android:secondaryProgress="70"    >

style="?android:attr/progressBarStyleHorizontal"    设置风格为长形 android:max="100"    最大进度值为100 android:progress="50"   初始化的进度值 android:secondaryProgress="70" 初始化的底层第二个进度值 android:layout_gravity="center_vertical"    垂直居中

2.ProgressBar在代码文件(.java)中的控制使用:

private ProgressBar myProgressBar;//定义ProgressBarmyProgressBar = (ProgressBar) findViewById(R.id.progressbar_updown);//ProgressBar通过ID来从XML中获取myProgressBar.incrementProgressBy(5);//ProgressBar进度值增加5myProgressBar.incrementProgressBy(-5);//ProgressBar进度值减少5myProgressBar.incrementSecondaryProgressBy(5);//ProgressBar背后的第二个进度条 进度值增加5myProgressBar.incrementSecondaryProgressBy(-5);//ProgressBar背后的第二个进度条 进度值减少5

3.XML重要属性

android:progressBarStyle：默认进度条样式

android:progressBarStyleHorizontal：水平样式

4.重要方法

getMax()：返回这个进度条的范围的上限getProgress()：返回进度getSecondaryProgress()：返回次要进度incrementProgressBy(int diff)：指定增加的进度isIndeterminate()：指示进度条是否在不确定模式下setIndeterminate(boolean indeterminate)：设置不确定模式下setVisibility(int v)：设置该进度条是否可视

二、代码展示:

1."Activity_09\src\yan\activity_09\MainActivity.java"

package yan.activity_09;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ProgressBar;import android.app.Activity;public class MainActivity extends Activity {// 声明变量private ProgressBar firstBar = null;private ProgressBar secondBar = null;private Button myButton = null;private int progress_vol = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);//映射控件ID到变量firstBar = (ProgressBar)findViewById(R.id.firstBar);secondBar = (ProgressBar)findViewById(R.id.secondBar);myButton = (Button)findViewById(R.id.myButton);myButton.setOnClickListener(new ButtonListenr());}class ButtonListenr implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif(0 == progress_vol){// 设置进度条的最大值firstBar.setMax(200);// 设置进度条为可见的状态firstBar.setVisibility(View.VISIBLE);secondBar.setVisibility(View.VISIBLE);}else if(progress_vol < firstBar.getMax()){// 设置主进度条的当前值firstBar.setProgress(progress_vol);// 设置第二进度条的当前值firstBar.setSecondaryProgress(progress_vol+10);// 默认的进度条是无法显示进行的状态的//secondBar.setProgress(progress_vol);}else{// 设置进度条为不可见的状态firstBar.setVisibility(View.GONE);secondBar.setVisibility(View.GONE);}progress_vol +=10;}}}

2."Activity_09\res\layout\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" android:background="#00aaaa"      >     <TextViewandroid:id="@+id/firstText"  android:text="@string/hello_world"  android:gravity="center_vertical"  android:textSize="15pt"  android:background="#aa0000"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:singleLine="true"/>  <ProgressBar    android:id="@+id/firstBar"    style="?android:attr/progressBarStyleHorizontal"    android:layout_width="200dp"    android:layout_height="wrap_content"    android:visibility="gone"    /><ProgressBar    android:id="@+id/secondBar"    style="?android:attr/progressBarStyle"    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>

3."Activity_09\res\values\strings.xml"

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">Activity_09</string>    <string name="hello_world">Hello world!</string>    <string name="menu_settings">Settings</string></resources>

三、效果展示:

本文完整代码下载地址:http://download.csdn.net/detail/ypist/5146876

拓展阅读文章: 花样Android ProgressBar 史上最强大讲解

Android学习笔记之progressBar(进度条)

本文博客源地址:http://blog.csdn.net/ypist

更多相关文章

随机推荐