Android系列之LinearLayout+EditText+Button+AlertDialog

这个简单的例子是EditText中默认有个字符串text，单击Show按钮，弹出AlertDialog显示EditText中的内容，单击Clear按钮，清除EditText中的内容！！

Activity用到两个LinearLayout,两个Button,一个TextView,一个EditText！

main.xml代码如下：

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    >

<TextView  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    android:text="@string/hello"

    />

<EditText

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:text="@string/text"

    android:id="@+id/text"

    />

<LinearLayout

	android:id="@+id/linearlayout1"

	android:layout_width="fill_parent"

	android:layout_height="wrap_content"

	android:gravity="center"

	>

	<Button

		android:layout_width="wrap_content"

		android:layout_height="wrap_content"

		android:text="@string/btnShow"

		android:id="@+id/btnShow"

		/>

	<Button

		android:layout_width="wrap_content"

		android:layout_height="wrap_content"

		android:text="@string/btnClear"

		android:id="@+id/btnClear"

		/>

</LinearLayout>

</LinearLayout>

 

java代码

 

  
    

   
     
   
      1 
   
     import
   
      android.app.Activity;

   
      2 
   
      
   
     import
   
      android.app.AlertDialog;

   
      3 
   
      
   
     import
   
      android.os.Bundle;

   
      4 
   
      
   
     import
   
      android.view.View;

   
      5 
   
     
   
     import
   
      android.widget.Button;

   
      6 
   
     
   
     import
   
      android.widget.EditText;

   
      7 
   
     

   
      8 
   
     
   
     public
   
      
   
     class
   
      practice 
   
     extends
   
      Activity {

   
      9 
   
      Button btnShow;

   
     10 
   
      Button btnClear;

   
     11 
   
      EditText text;

   
     12 
   
      
   
     /**
   
      Called when the activity is first created. 
   
     */
   
     

   
     13 
   
      @Override

   
     14 
   
      
   
     public
   
      
   
     void
   
      onCreate(Bundle savedInstanceState) {

   
     15 
   
      
   
     super
   
     .onCreate(savedInstanceState);

   
     16 
   
      setContentView(R.layout.main);

   
     17 
   
      

   
     18 
   
      btnShow 
   
     =
   
      (Button)findViewById(R.id.btnShow);

   
     19 
   
      btnClear 
   
     =
   
      (Button)findViewById(R.id.btnClear);

   
     20 
   
      text 
   
     =
   
      (EditText)findViewById(R.id.text);

   
     21 
   
      

   
     22 
   
      btnShow.setOnClickListener(
   
     new
   
      View.OnClickListener() {

   
     23 
   
      

   
     24 
   
      @Override

   
     25 
   
      
   
     public
   
      
   
     void
   
      onClick(View v) {

   
     26 
   
      
   
     //
   
      TODO Auto-generated method stub
   
     

   
     27 
   
     
   
      
   
     new
   
      AlertDialog.Builder(practice.
   
     this
   
     )

   
     28 
   
      .setTitle(
   
     "
   
     Infomation
   
     "
   
     )

   
     29 
   
      .setIcon(android.R.drawable.ic_dialog_dialer)

   
     30 
   
      .setMessage(text.getText())

   
     31 
   
      .show();

   
     32 
   
      }

   
     33 
   
      });

   
     34 
   
      

   
     35 
   
      btnClear.setOnClickListener(
   
     new
   
      View.OnClickListener() {

   
     36 
   
      

   
     37 
   
      @Override

   
     38 
   
      
   
     public
   
      
   
     void
   
      onClick(View v) {

   
     39 
   
      
   
     //
   
      TODO Auto-generated method stub
   
     

   
     40 
   
     
   
      text.setText(
   
     ""
   
     );

   
     41 
   
      }

   
     42 
   
      });

   
     43 
   
      }

   
     44 
   
     }