EditText是安卓的标准输入控件，也是最长用的控件，被认为是很简单的，但是当这个最简单、易用的控件碰上ListView列表控件的时候，坑爹的情况就出现了，焦点获取问题，输入的内容混乱问题、无法正常输入问题等等，总之就是简单的控件让开发变得头疼不已。究其原因，ListView的自条目会复用控件，导致edittext数据混乱，焦点的获取出现问题。遇到过问题的，都明白是怎么回事，这里不再截图展示问题，只是把解决方案和代码共享出来。废话少说，直接上代码：
package com.hongzhen.demo.activity;
import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import com.hongzhen.demo.R;
import com.hongzhen.demo.adapter.EdittextAdapter;
import com.hongzhen.demo.bean.ItemBean;
import java.util.ArrayList;
import java.util.List;
/**
* Created by hongzhen on 2017/9/4.
*/
public class EditTextListViewActivity extends Activity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edittext_listview);
ListView listView = (ListView) findViewById(R.id.list_view);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(EditTextListViewActivity.this, "toast: " + position, Toast.LENGTH_SHORT).show();
}
});
List<ItemBean> list = new ArrayList<>();
for (int i = 0; i < 50; i++) {
ItemBean itemTest = new ItemBean();
itemTest.setText("第"+i + "项");
list.add(itemTest);
}
EdittextAdapter adapter = new EdittextAdapter( list,this);
listView.setAdapter(adapter);
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_margin="5dp"
android:id="@+id/list_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:dividerHeight="5dp" />
</LinearLayout>
package com.hongzhen.demo.adapter;
import android.content.Context;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.Toast;
import com.hongzhen.demo.R;
import com.hongzhen.demo.bean.ItemBean;
import com.hongzhen.demo.watcher.MyTextWatcher;
import java.util.List;
/**
* Created by hongzhen on 2017/9/4.
*/
public class EdittextAdapter extends BaseAdapter implements View.OnClickListener, View.OnTouchListener, View.OnFocusChangeListener, View.OnLongClickListener {
private int selectedEditTextPosition = -1;
private List<ItemBean> mList;
private Context mContext;
public EdittextAdapter(List<ItemBean> mList,Context mContext) {
this.mContext=mContext;
this.mList = mList;
}
@Override
public int getCount() {
return mList.size();
}
@Override
public Object getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup viewGroup) {
ViewHolder vh;
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.item_edittext_listview, null);
vh = new ViewHolder(convertView);
convertView.setTag(vh);
} else {
vh = (ViewHolder) convertView.getTag();
}
vh.editText.setOnTouchListener(this); // 正确写法
vh.editText.setOnFocusChangeListener(this);
vh.editText.setTag(position);
if (selectedEditTextPosition != -1 && position == selectedEditTextPosition) { // 保证每个时刻只有一个EditText能获取到焦点
vh.editText.requestFocus();
} else {
vh.editText.clearFocus();
}
String text = mList.get(position).getText();
vh.editText.setText(text);
vh.editText.setSelection(vh.editText.length());
convertView.setTag(R.id.item_root, position); // 应该在这里让convertView绑定position
convertView.setOnClickListener(this);
convertView.setOnLongClickListener(this);
return convertView;
}
private TextWatcher mTextWatcher = new MyTextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (selectedEditTextPosition != -1) {
Log.w("MyEditAdapter", "onTextPosiotion " + selectedEditTextPosition);
ItemBean itemTest = (ItemBean) getItem(selectedEditTextPosition);
itemTest.setText(s.toString());
}
}
};
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
EditText editText = (EditText) v;
selectedEditTextPosition = (int) editText.getTag();
}
return false;
}
@Override
public void onFocusChange(View v, boolean hasFocus) {
EditText editText = (EditText) v;
if (hasFocus) {
editText.addTextChangedListener(mTextWatcher);
} else {
editText.removeTextChangedListener(mTextWatcher);
}
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.item_root) {
int position = (int) view.getTag(R.id.item_root);
Toast.makeText(mContext, "点击第 " + position + " 个item", Toast.LENGTH_SHORT).show();
}
}
@Override
public boolean onLongClick(View view) {
if (view.getId() == R.id.item_root) {
int position = (int) view.getTag(R.id.item_root);
Toast.makeText(mContext, "长按第 " + position + " 个item", Toast.LENGTH_SHORT).show();
}
return true;
}
public class ViewHolder {
EditText editText;
public ViewHolder(View convertView) {
editText = (EditText) convertView.findViewById(R.id.et_test);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/item_root"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#aaa"
android:gravity="center"
android:orientation="vertical">
<EditText
android:textColor="#fff"
android:id="@+id/et_test"
android:layout_width="200dp"
android:layout_height="50dp"
android:layout_gravity="left"
android:gravity="center"
android:singleLine="true"
android:textSize="20dp" />
</LinearLayout>