Android 開發工具 ADT 11 已供下載，改進編輯功能

ADT 11 重點改進編輯器。

• 首先，它提供了一些新的視覺重構操作，如"Extract Include'和"Extract Style". 這有助於自動提取片段重複佈局和樣式屬性為可重複使用的佈局，樣式和主題。
• 第二，可視化佈局編輯器現在支持的片段，調色板配置，更好地支持自定義視圖。
• 最後，已經改良XML編輯，更多文件類型的代碼完成(code completion)和增強許多"轉至聲明"(go to declaration)。

來源:
- Android開發者博客: New Editing Features in Eclipse plug-in for Android

動態修改列表視圖(ListView)的內容

修改前文"動態刪除列表視圖(ListView)的內容"的程序代碼, 在對話框(delAlertDialog)新增修改選項, 再建立另一個包含編輯文本視圖 (EditText) 的對話框(editDialog). 完成後, 通過 MyArrayAdapter.remove() 和 MyArrayAdapter.insert() 修改列表視圖(ListView)的內容.

package com.AndroidDynList;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

public class AndroidDynList extends Activity {
 
 EditText input;
 Button add, clear;
 ListView listview;
 ArrayAdapter<String> MyArrayAdapter;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       input = (EditText)findViewById(R.id.input);
    add = (Button)findViewById(R.id.add);
    clear = (Button)findViewById(R.id.clear);
    listview = (ListView)findViewById(R.id.list);
    
    MyArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
    listview.setAdapter(MyArrayAdapter);
    
    add.setOnClickListener(addOnClickListener);
    clear.setOnClickListener(clearOnClickListener);
    
    listview.setOnItemClickListener(listViewOnItemClickListener);
   }
  
   private Button.OnClickListener addOnClickListener
   = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   String newInput = input.getText().toString();
   MyArrayAdapter.add(newInput);
           MyArrayAdapter.notifyDataSetChanged();
  }};
  
 private Button.OnClickListener clearOnClickListener
 = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   MyArrayAdapter.clear();
            MyArrayAdapter.notifyDataSetChanged();
  }};
  
 private ListView.OnItemClickListener listViewOnItemClickListener
 = new ListView.OnItemClickListener(){

  @Override
  public void onItemClick(AdapterView<?> parent, View view, final int position,
    long id) {
   // TODO Auto-generated method stub
   final String strSelectedItem = parent.getItemAtPosition(position).toString();
   
   AlertDialog.Builder delAlertDialog = new AlertDialog.Builder(AndroidDynList.this);
   delAlertDialog.setTitle("- DELETE/Edit Selected Item? -");
   delAlertDialog.setMessage(strSelectedItem);
   delAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
           
               // do something when the button is clicked
               public void onClick(DialogInterface arg0, int arg1) {
                MyArrayAdapter.remove(strSelectedItem);
                   MyArrayAdapter.notifyDataSetChanged();
               }
           });
   delAlertDialog.setNeutralButton("Edit", new DialogInterface.OnClickListener() {
          
               // do something when the button is clicked
               public void onClick(DialogInterface arg0, int arg1) {
                AlertDialog.Builder editDialog = new AlertDialog.Builder(AndroidDynList.this);
                editDialog.setTitle("--- Edit ---");
                 
                final EditText editText = new EditText(AndroidDynList.this);
                editText.setText(strSelectedItem);
                editDialog.setView(editText);

                editDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                 // do something when the button is clicked
                 public void onClick(DialogInterface arg0, int arg1) {
                  MyArrayAdapter.remove(strSelectedItem);
                  MyArrayAdapter.insert(editText.getText().toString(), position);
                 }});
                editDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                 // do something when the button is clicked
                 public void onClick(DialogInterface arg0, int arg1) {
                  //... 
                 } 
                });
                editDialog.show();
               }
           });
   delAlertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
         
               // do something when the button is clicked
               public void onClick(DialogInterface arg0, int arg1) {
                   //...
               }
           });
        delAlertDialog.show();
  }};
}

利用 AlertDialog.Builder 創建包含編輯文本視圖 (EditText) 的對話框

package com.AndroidEditDialog;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class AndroidEditDialog extends Activity {
 
 Button btnEdit;
 TextView textOut;
 
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
  btnEdit = (Button)findViewById(R.id.edit);
  textOut = (TextView)findViewById(R.id.textout);
  
  btnEdit.setOnClickListener(btnEditOnClickListener);
 }

 private Button.OnClickListener btnEditOnClickListener
 = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   
   AlertDialog.Builder editDialog = new AlertDialog.Builder(AndroidEditDialog.this);
   editDialog.setTitle("--- Edit ---");
   
   final EditText editText = new EditText(AndroidEditDialog.this);
   editText.setText(textOut.getText());
   editDialog.setView(editText);
   
   editDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
    // do something when the button is clicked
    public void onClick(DialogInterface arg0, int arg1) {
     textOut.setText(editText.getText().toString());
     }
    });
   editDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
          // do something when the button is clicked
    public void onClick(DialogInterface arg0, int arg1) {
    //...
     }
    });
   editDialog.show();
   
  }};
}

<?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"
 />
<Button
 android:id="@+id/edit"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="Edit"
 />
<TextView
 android:id="@+id/textout"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="You can change it"
 />
</LinearLayout>

動態刪除列表視圖(ListView)的內容

跟進前一文"動態添加列表視圖(ListView)的內容"的帖子, 新增刪除的功能.

創建列表視圖(ListView)的 OnItemClickListener(), 當用戶點擊列表視圖的一個項目, 然後打開一個對話框, 如果用戶點擊"OK", 此一項目將被刪除.



佈局文件(main.xml)無需修改, 參閱前文"動態添加列表視圖(ListView)的內容".

修改主要代碼 AndroidDynList.java, 添加 listViewOnItemClickListener.

package com.AndroidDynList;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

public class AndroidDynList extends Activity {
 
 EditText input;
 Button add, clear;
 ListView listview;
 ArrayAdapter<String> MyArrayAdapter;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       input = (EditText)findViewById(R.id.input);
    add = (Button)findViewById(R.id.add);
    clear = (Button)findViewById(R.id.clear);
    listview = (ListView)findViewById(R.id.list);
    
    MyArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
    listview.setAdapter(MyArrayAdapter);
    
    add.setOnClickListener(addOnClickListener);
    clear.setOnClickListener(clearOnClickListener);
    
    listview.setOnItemClickListener(listViewOnItemClickListener);
   }
  
   private Button.OnClickListener addOnClickListener
   = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   String newInput = input.getText().toString();
   MyArrayAdapter.add(newInput);
           MyArrayAdapter.notifyDataSetChanged();
  }};
  
 private Button.OnClickListener clearOnClickListener
 = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   MyArrayAdapter.clear();
            MyArrayAdapter.notifyDataSetChanged();
  }};
  
 private ListView.OnItemClickListener listViewOnItemClickListener
 = new ListView.OnItemClickListener(){

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position,
    long id) {
   // TODO Auto-generated method stub
   final String strSelectedItem = parent.getItemAtPosition(position).toString();
   
   AlertDialog.Builder delAlertDialog = new AlertDialog.Builder(AndroidDynList.this);
   delAlertDialog.setTitle("- DELETE Selected Item? -");
   delAlertDialog.setMessage(strSelectedItem);
   delAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
           
               // do something when the button is clicked
               public void onClick(DialogInterface arg0, int arg1) {
                MyArrayAdapter.remove(strSelectedItem);
                   MyArrayAdapter.notifyDataSetChanged();
               }
           });
        delAlertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
         
               // do something when the button is clicked
               public void onClick(DialogInterface arg0, int arg1) {
                   //...
               }
           });
        delAlertDialog.show();
  }};
}

相關文章:
- 動態修改列表視圖(ListView)的內容

動態添加列表視圖(ListView)的內容

本範例先創建一個空的陣列適配器(ArrayAdapter), 它是一個列表視圖(ListView)的適配器(Adapter). 然後動態添加它的內容.

package com.AndroidDynList;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

public class AndroidDynList extends Activity {

EditText input;
Button add, clear;
ListView listview;
ArrayAdapter<String> MyArrayAdapter;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      input = (EditText)findViewById(R.id.input);
   add = (Button)findViewById(R.id.add);
   clear = (Button)findViewById(R.id.clear);
   listview = (ListView)findViewById(R.id.list);
  
   MyArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
   listview.setAdapter(MyArrayAdapter);
  
   add.setOnClickListener(addOnClickListener);
   clear.setOnClickListener(clearOnClickListener);
  }

  private Button.OnClickListener addOnClickListener
  = new Button.OnClickListener(){

 @Override
 public void onClick(View arg0) {
  // TODO Auto-generated method stub
  String newInput = input.getText().toString();
  MyArrayAdapter.add(newInput);
          MyArrayAdapter.notifyDataSetChanged();
 }};

    private Button.OnClickListener clearOnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   MyArrayAdapter.clear();
            MyArrayAdapter.notifyDataSetChanged();
  }};
}

<?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:id="@+id/input"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
<Button
  android:id="@+id/add"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Add"
  />
<Button
  android:id="@+id/clear"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Clear"
  />
<ListView
  android:id="@+id/list"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
</LinearLayout>

相關文章:
- 動態刪除列表視圖(ListView)的內容

Android 2.3.4@Nexus One

創建自定義的 GLSurfaceView，以處理用戶輸入

把前面的"GLSurfaceView 示例"修改, 創建自定義的GLSurfaceView，並實現onTouchEvent()函數, 便可以處理用戶輸入.

本例子中, 用戶在屏幕上移動手指, 畫面顏色會根據而改變.

AndroidGLSurfaceViewActivity.java

package com.AndroidGLSurfaceViewActivity;

import android.app.Activity;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.view.MotionEvent;

public class AndroidGLSurfaceViewActivity extends Activity {
 
 private MyGLSurfaceView myGLSurfaceView;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Create our Preview view and set it as the content of our
        // Activity
        myGLSurfaceView = new MyGLSurfaceView(this);
        setContentView(myGLSurfaceView);
    }

 @Override
 protected void onResume() {

  super.onResume();
  myGLSurfaceView.onResume();
 }

 @Override
 protected void onPause() {

  super.onPause();
  myGLSurfaceView.onPause();
 }

 class MyGLSurfaceView extends GLSurfaceView{
  
  MyRenderer myRenderer;

  public MyGLSurfaceView(Context context) {
   super(context);
   // TODO Auto-generated constructor stub
         myRenderer = new MyRenderer();
         setRenderer(myRenderer);
  }

  @Override
  public boolean onTouchEvent(final MotionEvent event) {
   // TODO Auto-generated method stub
   queueEvent(new Runnable(){
    
    public void run() {
     myRenderer.setColor(event.getX()/getWidth(),
       event.getY()/getHeight(), 1.0f);
    }});
   return true;
  }
 }

}

MyRenderer.java

package com.AndroidGLSurfaceViewActivity;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

public class MyRenderer implements android.opengl.GLSurfaceView.Renderer{

 private float red = 0;
    private float green = 0;
    private float blue = 0;

 @Override
 public void onDrawFrame(GL10 gl) {
  // TODO Auto-generated method stub
  gl.glClearColor(red, green, blue, 1.0f);
  gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
 }

 @Override
 public void onSurfaceChanged(GL10 arg0, int arg1, int arg2) {
  // TODO Auto-generated method stub
  
 }

 @Override
 public void onSurfaceCreated(GL10 arg0, EGLConfig arg1) {
  // TODO Auto-generated method stub
  
 }
 
 public void setColor(float r, float g, float b){
  red = r;
  green = g;
  blue = b;
 }

}