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：