Android-将Activity设置成Dialog

package com.mrzhu.dialogtest;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;public class DialogTestActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }        public void click(View v){    	startActivity(new Intent(DialogTestActivity.this, Activity2.class));    }}

package com.mrzhu.dialogtest;import android.app.Activity;import android.os.Bundle;import android.view.Window;import android.view.WindowManager;import android.view.WindowManager.LayoutParams;public class Activity2 extends Activity {	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity2);		Window window = getWindow();		WindowManager.LayoutParams layoutParams = window.getAttributes();		//设置窗口的大小及透明度		layoutParams.width = LayoutParams.FILL_PARENT;		layoutParams.height = layoutParams.FILL_PARENT;		layoutParams.alpha = 0.5f;		window.setAttributes(layoutParams);	}}

AndroidManifest.xml中加入：

 <activity            android:name=".Activity2"            android:theme="@style/Transparent" >        </activity>

style.xml:

<?xml version="1.0" encoding="utf-8"?><resources>    <style name="Transparent" parent="android:style/Theme.Dialog">        <item name="android:windowNoTitle">true</item>        <item name="android:windowIsTranslucent">true</item>        <item name="android:windowAnimationStyle">@+android:style/Animation.Translucent</item>    </style></resources>

main.xml:

<?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:orientation="vertical" >    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:onClick="click"        android:text="click" /></LinearLayout>