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：