在單擊按鈕問題後在EditText ListView中獲取文本內容

Question

我有EditText的列表視圖，並且當單擊確認按鈕時我需要獲取每個已編輯行的字符串值，但我不知道如何。

我試圖調整一些樣品沒有成功（我總是得到默認值，而不是編輯值）。

我的嘗試是這個

public class MyActivity extends Activity { 
    static int nItems; 

    ImageButton confirmButton; 
    ListView myList; 

    ListViewAdapterEditText adapterG1, adapterG2, adapterG3; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     ..... 
     myList = (ListView) findViewById(R.id.listaG1); 
     myList.setItemsCanFocus(true); 
     adapterG1 = new ListViewAdapterEditText(); 
     myList.setAdapter(adapterG1); 

    } 

    OnClickListener mConfirmButtonListener = new OnClickListener() { 
     public void onClick(View v) { 
     ArrayList a1 = adapterG1.getItems(); 
       for (int i = 0; i < nItems; i++) { 
        System.out.println(a1.get(i) 
          + "\n\n"); 
     } 
    }; 

    public class ListViewAdapterEditText extends BaseAdapter { 
     private LayoutInflater mInflater; 
     public ArrayList myItems = new ArrayList(); 
     ListItem listItem; 

     public ListViewAdapterEditText() { 
      mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      for (int i = 0; i < nItems; i++) { 
       listItem = new ListItem(); 
       listItem.caption = "Caption" + i; 
       myItems.add(listItem); 
      } 
      notifyDataSetChanged(); 
     } 

     public int getCount() { 
      return myItems.size(); 
     } 

     public Object getItem(int position) { 
      return position; 
     } 

     public long getItemId(int position) { 
      return position; 
     } 

     public ArrayList<String> getItems() { 
      ArrayList<String> items = new ArrayList<String>(); 
      for (int i = 0; i < nItems; i++) { 
       ListItem li = (ListItem) myItems.get(i); 
       items.add(li.getCaption()); 
      } 
      return items; 
     } 

     public View getView(int position, View convertView, ViewGroup parent) { 
      ViewHolder holder; 
      if (convertView == null) { 
       holder = new ViewHolder(); 
       convertView = mInflater.inflate(R.layout.list_item_row, 
         null); 
       holder.caption = (EditText) convertView 
         .findViewById(R.id.ItemCaption); 
       convertView.setTag(holder); 
      } else { 
       holder = (ViewHolder) convertView.getTag(); 
      } 
      // Fill EditText with the value you have in data source 
      holder.caption.setText(((ListItem) myItems.get(position)).caption); 
      // holder.caption.setText(myItems.get(position).caption); 
      holder.caption.setId(position); 

      // we need to update adapter once we finish with editing 
      holder.caption 
        .setOnFocusChangeListener(new OnFocusChangeListener() { 
         public void onFocusChange(View v, boolean hasFocus) { 
          if (!hasFocus) { 
           final int position = v.getId(); 
           final EditText Caption = (EditText) v; 
           ((ListItem) myItems.get(position)).caption = Caption 
             .getText().toString(); 
          } 
         } 
        }); 

      return convertView; 
     } 

     class ViewHolder { 
      EditText caption; 
     } 

     class ListItem { 
      String caption; 

      public String getCaption() { 
       return caption; 
      } 
     } 
    } 

} 

有人能幫助我解決這個問題呢？

Answer 1

你確定你的OnFocusChangeListener叫？如果您在EditText中編輯文本，然後點擊確認按鈕，由於焦點仍然位於EditText上，因此此監聽器不會在觸摸模式下調用。

更新：考慮您在EditText中編輯文本的情況，但未確認並滾動ListView以便項目視圖被回收，我不確定您喜歡的方式是什麼，但是如果您想存儲編輯的數據，您可以使用setRecyclerListener（android.widget.AbsListView.RecyclerListener）在項目視圖回收時得到通知，以便您可以保存編輯結果。要保存屏幕上顯示EditText的結果，可以使用getChildAt等方法獲取屏幕上可見的項目視圖，然後獲取EditText的文本。

Update2：另一種更好更乾淨的方式是使用TextWatcher和addTextChangeListener，它會在EditText中的文本發生更改時通知您。

Update3：我只寫了下面的示例並測試它，它可以在我的手機上使用。 :)

UPDATE4：我取下前面的代碼導致其性能差，創造了很多對象，你可以檢查以下全樣本代替：

活動代碼：

package com.example.asynctasktest; 

import java.util.List; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ListView; 

/** 
* @author Daniel Chow 
* 
* May 26, 2013 12:57:49 AM 
*/ 
public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     ListView listView = (ListView) findViewById(R.id.listview); 
     final TestAdapter adapter = new TestAdapter(this); 
     listView.setAdapter(adapter); 
     Button confirmButton = (Button) findViewById(R.id.confirm_button); 
     confirmButton.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       List<String> items = adapter.getItems(); 
       for (int i = 0, n = items.size(); i < n; i++) { 
        Log.e("", items.get(i)); 
       } 
      } 
     }); 
    } 

    @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; 
    } 


} 

適配器代碼：

/** 
* 
*/ 
package com.example.asynctasktest; 

import java.util.ArrayList; 
import java.util.List; 

import android.content.Context; 
import android.text.Editable; 
import android.text.TextWatcher; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.EditText; 

/** 
* @author Daniel Chow 
* 
*   May 26, 2013 1:13:02 AM */ 
public class TestAdapter extends BaseAdapter { 

    private List<String> items = new ArrayList<String>(); 
    private Context context; 

    public TestAdapter(Context context) { 
     this.context = context; 
     for (int i = 0; i < 12; i++) { 
      items.add("caption " + i); 
     } 
    } 

    public List<String> getItems() { 
     return new ArrayList<String>(items); 
    } 

    @Override 
    public int getCount() { 
     return 12; 
    } 

    @Override 
    public Object getItem(int position) { 
     return null; 
    } 

    @Override 
    public long getItemId(int position) { 
     return 0; 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     ViewHolder holder; 
     if (convertView == null) { 
      convertView = new EditText(context); 
      holder = new ViewHolder(); 
      holder.editText = (EditText) convertView; 
      holder.watcher = new EditTextWatcher(); 
      holder.editText.addTextChangedListener(holder.watcher); 
      convertView.setTag(holder); 
     } else { 
      holder = (ViewHolder) convertView.getTag(); 
     } 
     holder.watcher.setTarget(position); 
     holder.editText.setText(items.get(position)); 
     return convertView; 
    } 

    private class EditTextWatcher implements TextWatcher { 

     private int target; 

     public void setTarget(int target) { 
      this.target = target; 
     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      items.set(target, s.toString()); 
     } 

     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

     } 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 

     } 

    } 

    private static class ViewHolder { 
     EditText editText; 
     EditTextWatcher watcher; 
    } 

} 

Answer 2

我通常遵循一個簡單的技術

public class Item_Adapter extends BaseAdapter { 
     private String[] Val; 

public Item_Adapter() { 
    Val= new String[nItems]; 

} 
public View getView(int position, View convertView, ViewGroup parent) { 
      ViewHolder holder; 
///bla bla 

holder.caption 
       .setOnFocusChangeListener(new OnFocusChangeListener() { 
        public void onFocusChange(View v, boolean hasFocus) { 
         if (!hasFocus) { 
          final int position = v.getId(); 
          final EditText Caption = (EditText) v; 
          ((ListItem) myItems.get(position)).caption = Caption 
            .getText().toString(); 
          Val[position]= Caption 
            .getText().toString(); 

         } 
        } 
       }); 
     ///bla bla 
    return convertView; 
} 
    /////most important returning your array so you can use it in the Activity 
    public String[] getVal() { 
    return Val; 
}