android listview 每一项都是edittext 导致的坑爹问题 内容的保存和焦点,光标位置的设置

activity布局:布局很简单,只有一个listview

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.testlistviewandedittext.MainActivity" >

    <ListView
        android:id="@+id/lv_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

</RelativeLayout>

listview cell 的布局: 同样简单,只有一个edittext

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/et_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" >
    </EditText>

</LinearLayout>

activity代码: 代码也比较简单就是创建一个adapter然后设置给listview了

package com.example.testlistviewandedittext;

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

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Adapter;
import android.widget.ListView;

public class MainActivity extends Activity {

	private Context context;
	private ListView lv_main;
	private MyAdapter adapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initView();
	}

	private void initView() {
		// TODO Auto-generated method stub
		context = MainActivity.this;
		lv_main = (ListView) findViewById(R.id.lv_main);
		adapter = new MyAdapter(context, getStringList());
		lv_main.setAdapter(adapter);
	}

	private List<String> getStringList() {
		List<String> list = new ArrayList<String>();
		for(int i=0;i<30;i++) {
			list.add("我是第"+i+"个cell");
		}
		return list;
	}

}

然而,重点是在这里....

adapter的代码:

package com.example.testlistviewandedittext;

import java.util.HashMap;
import java.util.List;

import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;

public class MyAdapter extends BaseAdapter {

	private Context context;
	private List<String> strList;
	private int index = -1;// 当前获取焦点的位置
	private HashMap<Integer, String> contentMap = new HashMap<Integer, String>();// 保存edittext的数据,避免软键盘弹出和隐藏对数据的影响

	public MyAdapter(Context context, List<String> strList) {
		this.context = context;
		this.strList = strList;
	}

	@Override
	public int getCount() {
		return strList == null ? 0 : strList.size();
	}

	@Override
	public String getItem(int position) {
		return strList.get(position);
	}

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

	@Override
	public View getView(final int position, View convertView, ViewGroup parent) {
		// if (convertView == null) {
		viewHolder = new ViewHolder();
		convertView = View.inflate(context, R.layout.listview_cell, null);

		final EditText editText = (EditText) convertView
				.findViewById(R.id.et_content);

		// viewHolder.et_content = (EditText) convertView
		// .findViewById(R.id.et_content);
		// convertView.setTag(viewHolder);
		// } else {
		// viewHolder = (ViewHolder) convertView.getTag();
		// }

		if (contentMap.get(position) == null) {
			contentMap.put(position, getItem(position));// 保存一下
		}

		editText.setOnTouchListener(new OnTouchListener() {
			@Override
			public boolean onTouch(View v, MotionEvent event) {
				index = position;
				return false;
			}
		});

		editText.addTextChangedListener(new TextWatcher() {
			@Override
			public void onTextChanged(CharSequence s, int start, int before,
					int count) {
			}

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

			@Override
			public void afterTextChanged(Editable s) {
				Log.e("myadapter", "文字内容已经改变,当前文字:" + s.toString());
				contentMap.put(position, s.toString());// 把改变后的数据存储起来
			}
		});

		if (contentMap.get(position) != null) {
			Log.e("myadapter", position + "content不为空");
			editText.setText(contentMap.get(position));
		} else {
			Log.e("myadapter", position + "content为空");
			editText.setText("");
		}

		// 设置焦点和edittext设置光标位置,记住啊.一定要先设置text.然后再设置焦点和光标位置
		if (index != -1 && index == position) {
			editText.requestFocus();
			editText.setSelection(editText.getText().toString().length());
		}

		return convertView;
	}

	// cell 是edittext的话,如果再复用的话,会导致各种坑..慎重..
	private ViewHolder viewHolder;

	public static class ViewHolder {
		EditText et_content;
	}

}

千万不要重用edittext,效果真的很令人尴尬,还有一个需要注意的地方就是.一定要在设置text之后,再设置焦点和光标的位置,保存每一个edittext的内容用的是hashmap,记住要先存入hashmap,然后再从hashmap中取数据赋值给edittext

哦了,记录一下,

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