在项目中，我们经常需要通过网络请求去服务端获取相应的数据，以便于在客户端进行展示。而这个过程是需要网络的，因此就有了等待的过程。对于网络快的童靴，那么等待的时间就短；而对于网络慢的童靴，那么等待的时间就长。因此为了消除童靴们等待的焦虑感，我们需要显示一个progress dialog来提示童靴们，数据正在获取中，请稍候片刻。

先上效果图，效果图如下：

那么如何实现呢？直接上代码

1. 在anim文件夹下创建sf_progress_dialog_anim.xml，实现转动的效果：

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false" >

    <item
        android:drawable="@drawable/sf_progress_1"
        android:duration="200"/>
    <item
        android:drawable="@drawable/sf_progress_2"
        android:duration="200"/>
    <item
        android:drawable="@drawable/sf_progress_3"
        android:duration="200"/>
    <item
        android:drawable="@drawable/sf_progress_4"
        android:duration="200"/>
    <item
        android:drawable="@drawable/sf_progress_5"
        android:duration="200"/>
    <item
        android:drawable="@drawable/sf_progress_6"
        android:duration="200"/>
    <item
        android:drawable="@drawable/sf_progress_7"
        android:duration="200"/>
    <item
        android:drawable="@drawable/sf_progress_8"
        android:duration="60"/>

</animation-list>

资源文件可到如下链接进行下载：

http://download.csdn.net/detail/shenjichao2008/8248073

2. 在values文件夹中创建style.xml，自定义progress dialog的样式：

<style name="SF_dialogCustom" parent="@android:style/Theme.Dialog">
        <item name="android:windowFrame">@null</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
        <item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
    </style>

    <style name="SF_pressDialogCustom" parent="@style/SF_dialogCustom">
        <item name="android:windowBackground">@android:color/transparent</item> 
        <item name="android:windowNoTitle">true</item>
    </style>

<?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" >

    <ImageView
        android:id="@+id/sf_iv_progress_dialog_loading"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@anim/sf_progress_dialog_anim"
        android:contentDescription="@string/sf_progress_dialog_image_loading" />

    <TextView
        android:id="@+id/sf_tv_progress_dialog_loading"
        style="@style/SF_MediumLightGreyTxt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical" />

</LinearLayout>

package com.snapfish.view;

import com.snapfish.R;

import android.app.Dialog;
import android.content.Context;
import android.graphics.drawable.AnimationDrawable;
import android.text.TextUtils;
import android.view.Gravity;
import android.widget.ImageView;
import android.widget.TextView;

public class SFProgrssDialog extends Dialog {

	private static SFProgrssDialog m_progrssDialog;

	private SFProgrssDialog(Context context, int theme) {
		super(context, theme);
	}

	public static SFProgrssDialog createProgrssDialog(Context context) {
		m_progrssDialog = new SFProgrssDialog(context,
				R.style.SF_pressDialogCustom);
		m_progrssDialog.setContentView(R.layout.sf_view_custom_progress_dialog);
		m_progrssDialog.getWindow().getAttributes().gravity = Gravity.CENTER;

		return m_progrssDialog;
	}

	@Override
	public void onWindowFocusChanged(boolean hasFocus) {
		if (null == m_progrssDialog)
			return;

		ImageView loadingImageView = (ImageView) m_progrssDialog
				.findViewById(R.id.sf_iv_progress_dialog_loading);
		AnimationDrawable animationDrawable = (AnimationDrawable) loadingImageView
				.getBackground();
		animationDrawable.start();
	}

	public SFProgrssDialog setMessage(String msg) {
		TextView loadingTextView = (TextView) m_progrssDialog
				.findViewById(R.id.sf_tv_progress_dialog_loading);
		if (!TextUtils.isEmpty(msg))
			loadingTextView.setText(msg);
		else
			loadingTextView.setText(R.string.sf_progress_dialog_image_loading);

		return m_progrssDialog;
	}

}

private SFProgrssDialog m_customProgrssDialog;
final void showCustomProgrssDialog(String msg) {
		if (null == m_customProgrssDialog)
			m_customProgrssDialog = SFProgrssDialog
					.createProgrssDialog(m_parent);

		if (null != m_customProgrssDialog) {
			m_customProgrssDialog.setMessage(msg);
			m_customProgrssDialog.show();
			m_customProgrssDialog.setCancelable(false);
		}
	}

final void hideCustomProgressDialog() {
		if (null != m_customProgrssDialog) {
			m_customProgrssDialog.dismiss();
			m_customProgrssDialog = null;
		}
	}

6. 在网络请求之前，调用showCustomProgrssDialog方法，传入显示的message；在网络响应之后，调用hideProgressDialog方法，消除progress dialog。

Android ProgressDialog 控件自定义