Android实现网络加载时的对话框功能

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/dialog_view" 
 android:orientation="vertical"
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent"
 android:gravity="center">
 <ImageView 
 android:id="@+id/img"
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content"
 android:background="@android:color/transparent"
 android:src="@drawable/progress"
 />
 <TextView 
 android:id="@+id/tipTextView" 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:layout_marginLeft="10dp" 
 android:text="数据加载中……" /> 
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<set android:shareInterpolator="false" xmlns:android="http://schemas.android.com/apk/res/android">
 <rotate 
 android:interpolator="@android:anim/linear_interpolator"
 android:pivotX="50%"
 android:pivotY="50%"
 android:fromDegrees="0"
 android:toDegrees="+360"
 android:duration="1500"
 android:startOffset="-1"
 android:repeatMode="restart"
 android:repeatCount="-1"/>
</set>

CustomProgressDialog.class
package com.cc.customprogressdialog.util;
import android.app.Dialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.cc.customprogressdialog.R;
/**
 * Created by CC on 2017/2/4.
 */
public class CustomProgressDialog extends Dialog {
 Context context;
 private ImageView spaceshipImage;
 private Animation hyperspaceJumpAnimation;
 public CustomProgressDialog(Context context) {
 super(context);
 this.context = context;
 }
 public CustomProgressDialog(Context context, int theme) {
 super(context, theme);
 this.context = context;
 }
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 LayoutInflater inflater = LayoutInflater.from(context);
 View v = inflater.inflate(R.layout.dialog_loading, null);// 得到加载view
 LinearLayout layout = (LinearLayout) v.findViewById(R.id.dialog_view);// 加载布局
 // main.xml中的ImageView
 spaceshipImage = (ImageView) v.findViewById(R.id.img);
 // 加载动画
 hyperspaceJumpAnimation = AnimationUtils.loadAnimation(context, R.anim.loading_animation);
 // 使用ImageView显示动画
 spaceshipImage.startAnimation(hyperspaceJumpAnimation);
 setCancelable(false);// 不可以用“返回键”取消
 setContentView(layout, new LinearLayout.LayoutParams(
  LinearLayout.LayoutParams.MATCH_PARENT,
  LinearLayout.LayoutParams.MATCH_PARENT));// 设置布局
 }
}

package com.cc.customprogressdialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import com.cc.customprogressdialog.util.CustomProgressDialog;
public class MainActivity extends AppCompatActivity {
 private Button btn;
 private CustomProgressDialog mProgressDialog;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 btn = (Button) findViewById(R.id.btn);
 btn.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
  new AsyncTask<Void, Void, Void>() {
   @Override
   protected void onPreExecute() {
   super.onPreExecute();
   mProgressDialog = new CustomProgressDialog(MainActivity.this, R.style.loading_dialog);
   mProgressDialog.show();
   }
   @Override
   protected Void doInBackground(Void... voids) {
   SystemClock.sleep(2000);
   return null;
   }
   @Override
   protected void onPostExecute(Void aVoid) {
   super.onPostExecute(aVoid);
   mProgressDialog.dismiss();
   }
  }.execute();
  }
 });
 }
}

 <!-- 自定义loading dialog -->
 <style name="loading_dialog" parent="android:style/Theme.Dialog">
 <item name="android:windowFrame">@null</item>
 <item name="android:windowNoTitle">true</item>
 <item name="android:background">#00000000</item>
 <item name="android:windowBackground">@android:color/transparent</item>
 <item name="android:windowIsFloating">true</item>
 <item name="android:windowContentOverlay">@null</item>
 </style>