Android 中类似ModelWindow的一个实现

Android里一般的画面(Activity)都是尽量占满整个屏幕，这样符合单线程的设计，

而有些类似popup之类的子画面，却希望他弹出来的时候表现的如同web的模态窗口

(ModelWindow,Dialog等等)，在项目中出现了一个可以把子画面做成类似模态窗口

的例子。

代码

MainActivity.java

 package com.example.testpopactivity;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.TextView;

 public class MainActivity extends Activity implements OnClickListener {

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

         Button btnYes = (Button) findViewById(R.id.btnPopup);
         btnYes.setOnClickListener(this);

     }

     @Override
     public void onClick(View view) {
         switch (view.getId()) {
         case R.id.btnPopup:
             Intent intent = new Intent(MainActivity.this, PopupActivity.class);
             startActivityForResult(intent,R.layout.activity_popup);
             break;
         default:
             break;
         }

     }

     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         switch (requestCode) {
         case R.layout.activity_popup:
             String input = (data ==  null? "" : data.getStringExtra("input"));
             if(!"".equals(input)) {
                 TextView tvLabel = (TextView)findViewById(R.id.tvLabel);
                 tvLabel.setText(input);
             }
             break;
         default:
             break;
         }
     }

 }

PopupActivity.java

 package com.example.testpopactivity;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.EditText;

 public class PopupActivity extends Activity implements OnClickListener {

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

         setFinishOnTouchOutside(false); // to set this could prevent window from closing by touching transparent part.
         findViewById(R.id.btnOk).setOnClickListener(this);

     }

     @Override
     public void onClick(View view) {
         Intent intent = new Intent();
         switch (view.getId()) {
         case R.id.btnOk:
             String input = ((EditText) findViewById(R.id.etInput)).getText().toString();
             intent.putExtra("input", input);
             setResult(RESULT_OK, intent);
             finish();
             break;
         default:
             break;
         }
     }

 }

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"
     android:gravity="center"
     tools:context=".MainActivity" >

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

     <Button
         android:id="@+id/btnPopup"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@id/tvLabel"
         android:text="@string/btn_popup" />

 </RelativeLayout>

activity_popup.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="200dp"
    android:layout_height="100dp"
    android:gravity="center"
    tools:context=".PopupActivity" >

    <EditText
        android:id="@+id/etInput"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:inputType="text"
        android:text="@string/str_blank" />

    <Button
        android:id="@+id/btnOk"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_below="@id/etInput"
        android:text="@string/btn_ok" />

</RelativeLayout>

AndroidManifest.xml

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

     <uses-sdk
         android:minSdkVersion="14"
         android:targetSdkVersion="14" />

     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
         <activity
             android:name="com.example.testpopactivity.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>
         <activity
             android:name="com.example.testpopactivity.PopupActivity"
             android:label="@string/title_activity_popup"
             android:theme="@android:style/Theme.Dialog"
              >
         </activity>
     </application>

 </manifest>

效果如图：