Listview Android中的编辑文本问题怎么解决?

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我有Listview和编辑文本和文本视图。

当我触及编辑文本时,编辑文本就失去了焦点!

我已经实现的代码:

1)AndroidManifest.xml

<application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MyListViewDemoActivity"
                  android:label="@string/app_name"
                  android:windowSoftInputMode="adjustPan"
                  >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

</application>

2)raw_]layout.xml

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <EditText android:id="@+id/mEditText"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />  
</LinearLayout>

3)main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<ListView android:id="@+id/mListView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

4)MyListViewDemoActivity

public class MyListViewDemoActivity extends Activity {
    private ListView mListView;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mListView=(ListView)findViewById(R.id.mListView);
        mListView.setAdapter(new MyAdapter(this));
    }
}

class MyAdapter extends BaseAdapter {

    private Activity mContext;
    private String character[]={"a","b","c","d","e","f","g","h","i","j"};
    public MyAdapter(Activity context)
    {
        mContext=context;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return character.length;
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }
private class Holder
{
    EditText mEditText;
}
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        final Holder holder;
        if (convertView == null) {
            holder = new Holder();
            LayoutInflater inflater =mContext.getLayoutInflater();
            convertView = inflater.inflate(R.layout.raw_layout, null);
            holder.mEditText = (EditText) convertView
                    .findViewById(R.id.mEditText);
            convertView.setTag(holder);
        } else {
            holder = (Holder) convertView.getTag();
        }
        holder.mEditText.setText(character[position]);
        holder.mEditText.setOnFocusChangeListener(new OnFocusChangeListener() {

            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                // TODO Auto-generated method stub
                if (!hasFocus){
                    final EditText etxt = (EditText) v;
                    holder.mEditText.setText(etxt.getText().toString());
                }

            }
        });
        return convertView;
    }

}
提问于
用户回答回答于

第一:

Android:windowSoftInputMode=“调整大小”

在活动节点的AndroidManifest.xml中。

第二:我们创建一个POJO作为模型数据源来控制EditText状态

Line.java

public class Line{
    int num;
    String text;
    boolean focus;

    get set method and so on...
}

第三:我们编写了一个适配器来使EditText适应ListView。

Item item_line.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/frameLayout"
    android:layout_width="match_parent"
    android:layout_height="80dp">

    <EditText
        android:id="@+id/etLine"
        android:focusable="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"/>
</FrameLayout>

Adapter:

@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
    final ViewHolder holder;
    if (convertView == null) {
        holder = new ViewHolder();
        convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_line, parent, false);
        holder.etLine = (EditText) convertView.findViewById(R.id.etLine);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    final Line line = lines.get(position);

    // step 1: remove android.text.TextWatcher added in step 5 to make sure android.text.TextWatcher 
    //         don't trigger in step 2;
    // why?
    // 
    // note: When an object of a type is attached to an Editable, 
    //       TextWatcher's methods will be called when the EidtText's text is changed.
    //       
    //       EditText use a ArrayList<TextWatcher> type object to store the listener, so we must
    //       make sure there's only one TextWatcher object in this list;
    // 
    // Avoid triggering TextWatcher's method in step 2 we remove it at first time.
    // 
    if (holder.etLine.getTag() instanceof TextWatcher) {
        holder.etLine.removeTextChangedListener((TextWatcher) (holder.etLine.getTag()));
    }

    // step 2: set text and focus after remove android.text.TextWatcher(step 1);
    holder.etLine.setHint(position + ".");

    // set text
    if (TextUtils.isEmpty(line.getText())) {
        holder.etLine.setTextKeepState("");
    } else {
        holder.etLine.setTextKeepState(line.getText());
    }

    // set focus status
    // why?
    //
    // note: ListView has a very elegant recycle algorithm. So views in ListView is not reliable.
    //       Especially in this case, EditText is an item of ListView. Software input window may cause
    //       ListView relayout leading adapter's getView() invoke many times.
    //       Above all if we change EditText's focus state directly in EditText level(not in Adapter). 
    //       The focus state may be messed up when the particularly view reused in other position. 
    //       
    //       So using data source control View's state is the core to deal with this problem.   
    if (line.isFocus()) {
        holder.etLine.requestFocus();
    } else {
        holder.etLine.clearFocus();
    }

    // step 3: set an OnTouchListener to EditText to update focus status indicator in data source
    // why?
    // 
    // in step 2, we know we must control view state through data source. We use OnTouchListener
    // to watch the state change and update the data source when user move up fingers(ACTION_UP).
    // We don't want to consume the touch event, simply return false in method onTouch().
    holder.etLine.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_UP) {
                check(position);
            }
            return false;
        }
    });

    // step 4: set TextWatcher to EditText to listen text changes in EditText to updating the text in data source
    // why?
    // 
    // again, use data source to control view state.
    // When user edit the text in one EditText item and scroll the ListView. The particularly EditText item will be
    // reuse in adapter's getView(), this may lead text messed up in ListView.
    // How to deal with this problem?
    // Easy! We update the text in data source at the same time when user is editing. TextWatcher is the best way to
    // do this.
    final TextWatcher watcher = new SimpeTextWather() {

        @Override
        public void afterTextChanged(Editable s) {
            if (TextUtils.isEmpty(s)) {
                line.setText(null);
            } else {
                line.setText(String.valueOf(s));
            }
        }
    };
    holder.etLine.addTextChangedListener(watcher);

    // step 5: Set watcher as a tag of EditText.
    // so we can remove the same object which was setted to EditText in step 4;
    // Make sure only one callback is attached to EditText
    holder.etLine.setTag(watcher);

    return convertView;
}

/**
 * change focus status in data source
 */
private void check(int position) {
    for (Line l : lines) {
        l.setFocus(false);
    }
    lines.get(position).setFocus(true);
}

static class ViewHolder {
    EditText etLine;
}

你可以在我的GitHub上读到更多的细节。

演示:https://github.com/Aspsin/EditTextInListView

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