对话框风格的窗口

package com.crazyit.ui.dialogtheme;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class DialogThemeActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dialog_theme);

Button btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//结束 activity
finish();
}
});
}
}

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:gravity="center_horizontal"
tools:context="com.crazyit.ui.dialogdemo.DialogThemeActivity">

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/fuqi"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="确定"
android:id="@+id/btn"
/>
</LinearLayout>

清单文件中

<activity
android:name=".DialogThemeActivity"
android:label="@string/app_name"
android:theme="@android:style/Theme.Dialog">

<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>