package com.ruru.dialogproject;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

public class MainActivity extends Activity implements Runnable {

 LoadingDialog dialog;

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity_main);

  findViewById(R.id.btn_name).setOnClickListener(new View.OnClickListener() {

   @Override

   public void onClick(View view) {

    dialog = new LoadingDialog(MainActivity.this);

    dialog.setCanceledOnTouchOutside(false);

    dialog.show();

    new Thread(MainActivity.this).start();

   }

  });

 }

 public void run() {

  try {

   Thread.sleep();

   dialog.dismiss();

  } catch (InterruptedException e) {

   e.printStackTrace();

  }

 }

}

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

 xmlns:tools="http://schemas.android.com/tools"

 android:id="@+id/activity_main"

 android:layout_width="match_parent"

 android:layout_height="match_parent"

 tools:context="com.ruru.dialogproject.MainActivity">

 <Button

  android:id="@+id/btn_name"

  android:layout_width="match_parent"

  android:layout_height="wrap_content"

  android:text="Hello World!" />

</RelativeLayout>

package com.ruru.dialogproject;

import android.app.Dialog;

import android.content.Context;

import android.os.Bundle;

import android.widget.LinearLayout;

import android.widget.TextView;

/**

 * Created by 27c1 on 2017/1/4.

 */

public class LoadingDialog extends Dialog {

 private TextView tv;

 /**

  * style很关键

  */

 public LoadingDialog(Context context) {

  super(context, R.style.loadingDialogStyle);

 }

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.dialog_loading);

  tv = (TextView) findViewById(R.id.tv);

  tv.setText("正在上传.....");

  LinearLayout linearLayout = (LinearLayout) this.findViewById(R.id.LinearLayout);

  linearLayout.getBackground().setAlpha();

 }

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 android:layout_width="fill_parent"

 android:layout_height="fill_parent"

 android:background="@android:color/transparent"

 android:orientation="vertical">

 <LinearLayout

  android:id="@+id/LinearLayout"

  android:layout_width="160dp"

  android:layout_height="160dp"

  android:background="@drawable/yuanjiao"

  android:gravity="center"

  android:orientation="vertical">

  <ProgressBar

   android:id="@+id/progressBar1"

   style="?android:attr/progressBarStyleInverse"

   android:layout_width="wrap_content"

   android:layout_height="wrap_content"

   android:layout_gravity="center"

   android:background="@android:color/transparent" />

  <TextView

   android:id="@+id/tv"

   android:layout_width="wrap_content"

   android:layout_height="wrap_content"

   android:layout_gravity="center"

   android:paddingTop="10dp"

   android:textColor="#fff" />

 </LinearLayout>

</LinearLayout>
 

<style name="loadingDialogStyle" parent="android:Theme.Dialog">

  <item name="android:windowBackground">@android:color/transparent</item><!--设置dialog的背景-->

  <item name="android:windowFrame">@null</item><!--Dialog的windowFrame框为无-->

  <item name="android:windowNoTitle">true</item><!--是否显示title-->

  <item name="android:windowIsFloating">true</item><!--是否浮现在activity之上-->

  <item name="android:windowIsTranslucent">true</item><!--是否半透明-->

  <item name="android:windowContentOverlay">@null</item><!--是否半透明-->

  <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item><!-- 对话框是否有遮盖 -->

  <item name="android:backgroundDimEnabled">false</item><!--背景是否模糊显示-->

  <item name="android:backgroundDimAmount">0.6</item><!--背景的灰度-->

 </style>

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android">

 <solid android:color="#86222222" />

 <corners

  android:bottomLeftRadius="10dp"

  android:bottomRightRadius="10dp"

  android:topLeftRadius="10dp"

  android:topRightRadius="10dp" />

</shape>
 

<item name="android:windowFrame">@null</item> ：Dialog的windowFrame框为无

<item name="android:windowIsFloating">true</item>：是否浮现在activity之上

<item name="android:windowIsTranslucent">false</item>:是否半透明

<item name="android:windowNoTitle">true</item>:是否显示title

<item name="android:windowBackground">@drawable/dia_bg</item>:设置dialog的背景

<item name="android:backgroundDimEnabled">true</item>背景是否模糊显示

<item name="android:backgroundDimAmount">0.6</item>背景的灰度