Android UI 之 ProgressBar、ProgressDialog、AlertDialog

参考：
http://www.cnblogs.com/plokmju/p/android_ProgressBar.html http://www.oschina.net/question/157182_37992
《第一行代码》P100

一、ProgressBar

ProgressBar: 进度条

内置的进度条样式有两种写法，以水平进度条为例：

style="?android:attr/progressBarStyleHorizontal"
style="@android:style/Widget.ProgressBar.Horizontal"

效果如下：



常用属性：

android:max：设置进度的最大值。
android:progress:设置当前第一进度值。
android:secondaryProgress：设置当前第二进度值。
android:visibility：设置是否显示，默认显示。visible可见，invisible不可见但占据屏幕空间，gone不可见且不占用屏幕空间

设置第二进度后的效果如下：



动态控制进度条：

setProgress(int)：设置当前进度值
incrementProgressBy(int)：设置当前进度值的增量
setSecondaryProgress(int)：与上类似
incrementSecondaryProgressBy(int)：与上类似

设置可见性：

setVisibility()，一共三个参数，View.VISIBLE, View.INVISIBLE, View.GONE。对应XML的三个属性

其他样式都是圆形动画，无法控制进度。样式大同小异，如下：

二、ProgressDialog

简易用法：

private ProgressDialog progressDialog;

private void showProgressDialog() {
if (progressDialog == null) {
progressDialog = new ProgressDialog(context);
progressDialog.setMessage("正在加载");
progressDialog.setCanceledOnTouchOutside(false);
}
progressDialog.show();
}

private void closeProgressDialog() {
if (progressDialog != null) {
progressDialog.dismiss();
}
}

三、AlertDialog

简易用法：

/** 创建AlertDialog并显示 **/
private void showAlertDialog() {
// 下面的设置项都是可选的
AlertDialog.Builder alertD = new AlertDialog.Builder(this)
.setTitle("这里是标题")
.setIcon(R.drawable.ic_launcher)
.setMessage("这里是提示信息")
.setView(myLayout) // 要在AlertDialog中显示的自定义View对象
.setCancelable(false) // 不能按手机的返回键取消
.setPositiveButton("PositiveButton显示进度值", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// do something...
}
})
.setNegativeButton("NegativeButton取消", null);
alertD.create();
// This allows the user to do any extra processing before displaying the dialog.
// Use show() if you don't have any other processing to do and want this to be created and displayed.
alertD.show();
}

四、Demo

进度条相关的ProgressDialog、AlertDialog的Demo

activity_main.xml:

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="圆进度条@android:style/Widget.ProgressBar"
/>
<ProgressBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@android:style/Widget.ProgressBar"
/>

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="圆进度条Style：?android:attr/progressBarStyle"
/>
<ProgressBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyle"
/>

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="长进度条@android:style/Widget.ProgressBar.Horizontal"
/>
<ProgressBar
android:id="@+id/progressbar_horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@android:style/Widget.ProgressBar.Horizontal"
/>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>

<Button
android:id="@+id/button_Add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
/>

<Button
android:id="@+id/button_Reduce"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:layout_marginLeft="30dp"
/>

<Button
android:id="@+id/button_visible"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="显/隐进度条"
android:layout_marginLeft="30dp"
/>

</LinearLayout>

<Button
android:id="@+id/button_pd_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="圆形进度条的ProgressDialog"
/>
<Button
android:id="@+id/button_ad_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="长方形进度条的AlertDialog"
/>

</LinearLayout>

my_view.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:gravity="center_horizontal"
>

<Button
android:id="@+id/myView_reduce"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:text="-"
/>

<ProgressBar
android:id="@+id/myView_progressBar"
android:layout_width="178dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
style="@android:style/Widget.ProgressBar.Horizontal"
android:progress="57"
/>

<Button
android:id="@+id/myView_add"
android:layout_height="wrap_content"
android:layout_width="50dp"
android:text="+"
/>

</LinearLayout>

MainActivity.java:

package com.example.test;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{

private Button btnAdd, btnReduce, btnVisible, btnPb1, btnAd1, myUp, myDown;
private ProgressBar pbHor, myPb;
private AlertDialog.Builder alertD;
private LayoutInflater layoutInflater;
private LinearLayout myLayout;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setProgressBarVisibility(true);
setContentView(R.layout.activity_main);

btnAdd = (Button) findViewById(R.id.button_Add);
btnReduce = (Button) findViewById(R.id.button_Reduce);
btnVisible = (Button) findViewById(R.id.button_visible);
btnPb1 = (Button) findViewById(R.id.button_pd_1);
btnAd1 = (Button) findViewById(R.id.button_ad_1);
pbHor = (ProgressBar) findViewById(R.id.progressbar_horizontal);

btnAdd.setOnClickListener(this);
btnReduce.setOnClickListener(this);
btnVisible.setOnClickListener(this);
btnPb1.setOnClickListener(this);
btnAd1.setOnClickListener(this);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button_Add:
if (pbHor.getProgress() <= 90) {
pbHor.setProgress(pbHor.getProgress() + 10);
}
break;
case R.id.button_Reduce:
if (pbHor.getProgress() >= 10) {
pbHor.setProgress(pbHor.getProgress() - 10);
}
break;
case R.id.button_visible:
if (pbHor.getVisibility() == View.VISIBLE) {
pbHor.setVisibility(View.GONE);
} else {
pbHor.setVisibility(View.VISIBLE);
}
break;
case R.id.button_pd_1:
// 创建一个ProgressDialog，不能写成如下一大串
ProgressDialog mypDialog = new ProgressDialog(this);
// 默认为圆形风格，STYLE_HORIZONTAL则为长方形风格
// mypDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
// 标题
mypDialog.setTitle("KingLearnJava");
// 提示信息
mypDialog.setMessage(getResources().getString(R.string.pd_message));
// 标题图标
mypDialog.setIcon(R.drawable.ic_launcher);
// 第一个按钮
mypDialog.setButton("第一个按钮", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
// 第二个按钮
mypDialog.setButton2("第二个按钮", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
// 进度条是否不明确
mypDialog.setIndeterminate(false);
// 是否可以按返回键取消
mypDialog.setCancelable(true);
// 显示
mypDialog.show();
break;
case R.id.button_ad_1:
// 这里用另一种方法来载入布局
// 获得系统的布局过滤服务
layoutInflater = (LayoutInflater) getSystemService(this.LAYOUT_INFLATER_SERVICE);
// 得到事先设计好的布局
myLayout = (LinearLayout) layoutInflater.inflate(R.layout.my_view, null);
// 获得自定义View里的控件
myUp = (Button) myLayout.findViewById(R.id.myView_add);
myDown = (Button) myLayout.findViewById(R.id.myView_reduce);
myPb = (ProgressBar) myLayout.findViewById(R.id.myView_progressBar);
myUp.setOnClickListener(this);
myDown.setOnClickListener(this);
// 设置初始进度值
myPb.setProgress(50);
alertD = new AlertDialog.Builder(this)
.setTitle("这里是标题")
.setIcon(R.drawable.ic_launcher)
.setMessage("这里是提示信息")
.setView(myLayout)
.setCancelable(false) // 不能按手机的返回键取消
.setPositiveButton("PositiveButton显示进度值", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "现在的进度值是" + myPb.getProgress()
, Toast.LENGTH_LONG).show();
}
})
.setNegativeButton("NegativeButton取消", null);
alertD.show();
break;
case R.id.myView_add:
myPb.incrementProgressBy(1);
break;
case R.id.myView_reduce:
myPb.incrementProgressBy(-1);
break;
default:
break;
}
}

}

效果如图：