Android实现毛玻璃效果的对话框

一个popwindow，在弹出的时候背景是原界面的截图加高斯模糊效果：

先给出popwindow的布局文件

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/FrameLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/roundcorner" >

<com.npi.blureffect.ScrollableImageView
android:id="@+id/imageView1"
android:background="@drawable/roundcorner"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/roundcorner" />

<RelativeLayout
android:id="@+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
 android:id="@+id/textView1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignParentLeft="false"
 android:layout_alignParentTop="false"
 android:layout_centerHorizontal="true"
 android:layout_centerInParent="false"
 android:layout_centerVertical="false"
 android:layout_marginLeft="33dp"
 android:layout_marginTop="44dp"
 android:text="这是提示语" />

<TextView
 android:id="@+id/textView2"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignParentLeft="false"
 android:layout_below="@+id/textView1"
 android:layout_centerHorizontal="true"
 android:layout_marginTop="49dp"
 android:text="确定"
 android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

</FrameLayout>

里面那个自定义imageView控件在我上一篇博客里，下面是activity的布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/window"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.npi.blureffect.TestActivity" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

<RatingBar
android:id="@+id/ratingBar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="124dp" />

<Switch
android:id="@+id/switch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/ratingBar1"
android:layout_below="@+id/ratingBar1"
android:layout_marginLeft="24dp"
android:layout_marginTop="81dp"
android:text="Switch" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/ratingBar1"
android:layout_below="@+id/ratingBar1"
android:text="Button" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/ratingBar1"
android:layout_alignLeft="@+id/switch1"
android:layout_marginBottom="52dp"
android:text="Button" />

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button1"
android:layout_alignLeft="@+id/ratingBar1"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

用于圆角的背景xml，放在drawable文件夹中

<?xml version="1.0" encoding="UTF-8" ?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
 <shape>
 <solid android:color="#efefef" /><!-- 连框颜色值 -->

<!-- 设置圆角边框 -->
  <corners
  android:topLeftRadius="20dp"  
  android:topRightRadius="20dp"  
  android:bottomRightRadius="20dp"  
  android:bottomLeftRadius="20dp"
  />
 </shape>
</item>
<!-- 主体背景颜色值 -->
<item android:bottom="20dp" android:top="20dp" android:left="20dp" android:right="20dp"> <!--上下左右四个边框的宽度，为0的话就没有了-->
 <shape>
 <solid android:color="#efefef" /> <!-- 背景白色 -->
 </shape>
</item>
</layer>

activity的源码

package com.npi.blureffect;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Point;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class TestActivity extends Activity {
TextView textView1;
RelativeLayout window;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
textView1 = (TextView) findViewById(R.id.textView1);
window = (RelativeLayout)findViewById(R.id.window);
textView1.setOnClickListener(new OnClickListener() {

@Override
 public void onClick(View v) {
 // TODO Auto-generated method stub
 initPopuptWindow(window);
 }
});

}
PopupWindow popupWindow;

/**
* 创建PopupWindow
*/
protected void initPopuptWindow(View layout) {
// TODO Auto-generated method stub
//对当前页面进行截屏
layout.setDrawingCacheEnabled(true);
layout.buildDrawingCache(); //启用DrawingCache并创建位图
Bitmap screen = Bitmap.createBitmap(layout.getDrawingCache()); //创建一个DrawingCache的拷贝，因为DrawingCache得到的位图在禁用后会被回收
layout.setDrawingCacheEnabled(false); //禁用DrawingCahce否则会影响性能

//将截屏进行模糊
screen = Blur.fastblur(this, screen, 15);

// 获取自定义布局文件activity_popupwindow_left.xml的视图
final View popupWindow_view = getLayoutInflater().inflate(R.layout.ioswindow, null,
 false);
// 创建PopupWindow实例,200,LayoutParams.MATCH_PARENT分别是宽度和高度
final ScrollableImageView background = (ScrollableImageView) popupWindow_view.findViewById(R.id.imageView1);
background.setoriginalImage(screen);
final int screenWidth = getScreenWidth(this);
final int screenHeight = screen.getHeight();
final int heightless = getScreenHeight(this)-screenHeight;
Log.i("Alex", "屏幕宽度为"+screenWidth+"高度为"+screenHeight+"偏差为"+heightless);
popupWindow = new PopupWindow(popupWindow_view, (int) (screenWidth*0.8), (int) (screenWidth*0.85*0.5), true); //设置popwindow的大小
popupWindow.showAtLocation(textView1, Gravity.CENTER, 0, 0);//设置popwindow的位置
popupWindow_view.post(new Runnable() {

@Override
 public void run() {
 // TODO Auto-generated method stub
 int left = screenWidth/10;
 Log.i("Alex", screenHeight+"-"+screenWidth*0.85*0.5);
 int top = (int) ((screenHeight-screenWidth*0.85*0.5)/2-heightless/2);
 Log.i("Alex", "top是"+top);
 background.handleScroll(top, left);
 }
});

// 设置动画效果
// 点击其他地方消失
TextView confirm = (TextView) popupWindow_view.findViewById(R.id.textView2);
confirm.setOnClickListener(new OnClickListener() {

@Override
 public void onClick(View v) {
 // TODO Auto-generated method stub
 popupWindow.dismiss();
 }
});

}

/**
* Get the screen width.
*
* @param context
* @return the screen width
*/
@SuppressWarnings("deprecation")
@SuppressLint("NewApi")
public static int getScreenWidth(Activity context) {

Display display = context.getWindowManager().getDefaultDisplay();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
 Point size = new Point();
 display.getSize(size);
 return size.x;
}
return display.getWidth();
}

/**
* Get the screen height.
*
* @param context
* @return the screen height
*/
@SuppressWarnings("deprecation")
@SuppressLint("NewApi")
public static int getScreenHeight(Activity context) {

Display display = context.getWindowManager().getDefaultDisplay();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
 Point size = new Point();
 display.getSize(size);
 return size.y;
}
return display.getHeight();
}
}

第二种样式，比第一种简单但是效果更明显也更大众化

这个是在原来布局的最上层加上了一个不可见的imageView，在弹出popwindow之前用这个imageView盖住底下的东西

布局如下

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/window"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.npi.blureffect.DialogActivity" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<RatingBar
android:id="@+id/ratingBar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="124dp" />

<Switch
android:id="@+id/switch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/ratingBar1"
android:layout_below="@+id/ratingBar1"
android:layout_marginLeft="24dp"
android:layout_marginTop="81dp"
android:text="Switch" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/ratingBar1"
android:layout_below="@+id/ratingBar1"
android:text="Button" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/ratingBar1"
android:layout_alignLeft="@+id/switch1"
android:layout_marginBottom="52dp"
android:text="Button" />

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button1"
android:layout_alignLeft="@+id/ratingBar1"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />

<ProgressBar
android:id="@+id/progressBar1"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="49dp"
android:layout_toLeftOf="@+id/button1" />

<ProgressBar
android:id="@+id/progressBar2"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/switch1"
android:layout_toRightOf="@+id/switch1" />

<RadioButton
android:id="@+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/progressBar1"
android:layout_alignLeft="@+id/switch1"
android:text="RadioButton" />

<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/progressBar2"
android:layout_below="@+id/progressBar2"
android:text="Button" />

<ImageView
android:id="@+id/background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff"
android:visibility="gone" />

</RelativeLayout>

activity 如下

package com.npi.blureffect;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.Point;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class DialogActivity extends Activity {
TextView textView1;
RelativeLayout window;
ImageView background;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dialog);
textView1 = (TextView) findViewById(R.id.textView1);
window = (RelativeLayout)findViewById(R.id.window);
background = (ImageView) findViewById(R.id.background);

textView1.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
initPopuptWindow(window);
}
});
}

PopupWindow popupWindow;

/**
* 创建PopupWindow
*/
protected void initPopuptWindow(View layout) {
// TODO Auto-generated method stub
//对当前页面进行截屏
layout.setDrawingCacheEnabled(true);
layout.buildDrawingCache(); //启用DrawingCache并创建位图
Bitmap screen = Bitmap.createBitmap(layout.getDrawingCache()); //创建一个DrawingCache的拷贝，因为DrawingCache得到的位图在禁用后会被回收
layout.setDrawingCacheEnabled(false); //禁用DrawingCahce否则会影响性能
Log.i("Alex", "转换前bitmap的大小是"+screen.getWidth()+" : "+screen.getHeight());
screen = scaleBitmap(screen, screen.getWidth()/2, screen.getHeight()/2);//压缩bitmap到指定大小
Log.i("Alex", "转换后bitmap的大小是"+screen.getWidth()+" : "+screen.getHeight());
//将截屏进行模糊
screen = Blur.fastblur(this, screen, 10);

// 获取自定义布局文件activity_popupwindow_left.xml的视图
final View popupWindow_view = getLayoutInflater().inflate(R.layout.ioswindow, null,
false);

// 创建PopupWindow实例,200,LayoutParams.MATCH_PARENT分别是宽度和高度
background.setImageBitmap(screen);
background.setVisibility(View.VISIBLE);
final int screenWidth = getScreenWidth(this);
popupWindow = new PopupWindow(popupWindow_view, (int) (screenWidth*0.8), (int) (screenWidth*0.85*0.5), true); //设置popwindow的大小
popupWindow.showAtLocation(textView1, Gravity.CENTER, 0, 0);//设置popwindow的位置
popupWindow_view.post(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
int left = screenWidth/10;
}
});

// 设置动画效果
// 点击其他地方消失
TextView confirm = (TextView) popupWindow_view.findViewById(R.id.textView2);
confirm.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
background.setVisibility(View.GONE);
popupWindow.dismiss();
}
});

}

/**
* Get the screen width.
*
* @param context
* @return the screen width
*/
@SuppressWarnings("deprecation")
@SuppressLint("NewApi")
public static int getScreenWidth(Activity context) {

Display display = context.getWindowManager().getDefaultDisplay();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
Point size = new Point();
display.getSize(size);
return size.x;
}
return display.getWidth();
}

/**
* 把一个bitmap压缩，压缩到指定大小
* @param bm
* @param width
* @param height
* @return
*/
private static Bitmap scaleBitmap(Bitmap bm, float width, float height) {
if (bm == null) {
return null;
}
int bmWidth = bm.getWidth();
int bmHeight = bm.getHeight();
float scaleWidth = width / bmWidth;
float scaleHeight = height / bmHeight;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);

if (scaleWidth == 1 && scaleHeight == 1) {
return bm;
} else {
Bitmap resizeBitmap = Bitmap.createBitmap(bm, 0, 0, bmWidth,
 bmHeight, matrix, false);
bm.recycle();//回收图片内存
bm.setDensity(240);
return resizeBitmap;
}
}
}

来源：https://blog.csdn.net/lvshaorong/article/details/50392057