activity類的拓展方法1：getLayoutInflater():將layout的xml佈局檔案例項化為View類物件，實現動態載入佈局

MainActivity.java

package com.example.dynamiclayout;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

	

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Button btn1=(Button)findViewById(R.id.button1);
		btn1.setOnClickListener(listener);
	}
	
	private View.OnClickListener listener=new View.OnClickListener() {
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			AlertDialog.Builder builder=new Builder(MainActivity.this);
			LayoutInflater inflater=MainActivity.this.getLayoutInflater();
			View layout=inflater.inflate(R.layout.login_view, null);
			builder.setIcon(R.drawable.ic_launcher)
			.setTitle("使用者登入")
			.setView(layout)
			.setPositiveButton("登陸", new DialogInterface.OnClickListener() {
				
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
					//單機登陸按鈕後的業務邏輯
					
				}
			});
			builder.create().show();
		}
	};
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}
 

1: activity_main.xml

<RelativeLayout 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"  
    tools:context=".MainActivity" >


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


    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:text="登陸" />


</RelativeLayout>
 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">
        <TextView 
            android:text="使用者名稱："
            android:layout_width="90dp"
            android:layout_height="wrap_content"
            android:textSize="20sp"/>
        <EditText 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/user"/>
    </LinearLayout>
    
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">
        <TextView 
            android:layout_width="90dp"
            android:layout_height="wrap_content"
            android:text="密碼"
            android:textSize="20sp"/>
        <EditText 
            android:id="@+id/password"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:password="true"/>
    </LinearLayout>

</LinearLayout>
 

2)value/strings.xml

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

    <string name="app_name">dynamiclayout</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">動態載入佈局檔案，實現彈窗效果</string>

</resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.dynamiclayout"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.dynamiclayout.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>