我从数据库中挑选了一些数据，然后在列表视图中显示它们。 在我的listview中，我有一个textview和每个列表项的按钮。 我希望每当点击列表项的按钮时，它将显示来自listitem的相应文本视图的文本。
用于实现列表项按钮操作的mycode就是这样。
final TestAdapter mDbHelper = new TestAdapter(this);
mDbHelper.createDatabase();
EditText word_from_box;
//ListView mylist ;
//SimpleAdapter adapter;
word_from_box=(EditText) findViewById(R.id.editText1);
final ListView listView = (ListView) findViewById(R.id.mylist);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),"Clicked a list item ", Toast.LENGTH_SHORT).show();
Button fav_b=(Button) findViewById(R.id.fav_btn);
fav_b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),"clicked on button on a listview ", Toast.LENGTH_SHORT).show();
}
});
}
});
以及将数据显示在数据库列表视图中的代码就是这样：
mDbHelper.open();
String ss=s.toString();
ArrayList<HashMap<String, String>> list_of_wordmeanings = new ArrayList<HashMap<String, String>>();
Cursor mCursor = mDbHelper.getTestData(ss);
for (int i = 0; i < mCursor.getCount(); i++)
{
mCursor.moveToPosition(i);
String string = mCursor.getString(1);
HashMap<String, String> hm = new HashMap<String, String>();
String word = mCursor.getString(0).toString();
String meaning = mCursor.getString(1).toString();
hm.put("key_word",word);
hm.put("key_meaning",meaning);
list_of_wordmeanings.add(hm);
}
// Keys used in Hashmap
String[] from = { "key_word","key_meaning" };
// Ids of views in listview_layout
int[] to = { R.id.txt1,R.id.txt2};
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), list_of_wordmeanings, R.layout.list_layout, from, to);
// adapter=new SimpleAdapter(this,list_of_reg_info,R.layout.list_layout,new String[] { "key_name","key_password" },new int[] { R.id.text1, R.id.text2 });
// Setting the adapter to the listView
listView.setAdapter(adapter);
但是当我点击listview的项目时它不起作用，当我点击列表项目上的按钮时它也不起作用。 我怎么能这样做？
N：B：我的TestAdapter类是：
protected static final String TAG = "DataAdapter";
private final Context mContext;
private SQLiteDatabase mDb;
private DataBaseHelper mDbHelper;
public TestAdapter(Context context)
{
this.mContext = context;
mDbHelper = new DataBaseHelper(mContext);
}
public TestAdapter createDatabase() throws SQLException
{
try
{
mDbHelper.createDataBase();
}
catch (IOException mIOException)
{
Log.e(TAG, mIOException.toString() + " UnableToCreateDatabase");
throw new Error("UnableToCreateDatabase");
}
return this;
}
public TestAdapter open() throws SQLException
{
try
{
mDbHelper.openDataBase();
mDbHelper.close();
mDb = mDbHelper.getReadableDatabase();
}
catch (SQLException mSQLException)
{
Log.e(TAG, "open >>"+ mSQLException.toString());
throw mSQLException;
}
return this;
}
public void close()
{
mDbHelper.close();
}
public Cursor getTestData(String s)
{
try
{
//String sql ="SELECT * FROM Table1 LIMIT 5";//"SELECT * FROM " + TABLE_REGISTRATION +" WHERE "+ KEY_NAME +" LIKE '"+ s +"%'" ;
String sql ="SELECT * FROM dic WHERE english LIKE '"+ s +"%' LIMIT 5" ;
Cursor mCur = mDb.rawQuery(sql, null);
if (mCur!=null)
{
mCur.moveToNext();
}
return mCur;
}
catch (SQLException mSQLException)
{
Log.e(TAG, "getTestData >>"+ mSQLException.toString());
throw mSQLException;
}
}
答案 0 :(得分：2)
您可以在适配器类的getView中执行此操作。在适配器getView中为您的按钮实现OnClickListener。
在getView中
holder.button.setOnClickListener(mClickListener);
holder.button.setTag(holder.tv.getText());
然后
private OnClickListener mClickListener = new OnClickListener() {
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"Text is"+v.getTag(),Toast.LENGTH_SHORT).show();
}
};
编辑：
CustomAdapter cus = new CustomAdapter(MainActivity.this, list_of_wordmeanings);
listview.setAdapter(cus);
CustomAdapter
public class CustomAdapter extends BaseAdapter
{
@Override
public int getCount() {
// TODO Auto-generated method stub
return items.size();
}
LayoutInflater inflater;
Context mContext;
ArrayList<HashMap<String,String>> items;
public CustomAdapter(Context context, ArrayList<HashMap<String,String>> List) {
// TODO Auto-generated constructor stub
inflater = LayoutInflater.from(context);
mContext = context;
items= List;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if(convertView==null)
{
convertView = inflater.inflate(R.layout.list_item, parent,false);
holder = new ViewHolder();
holder.tv = (TextView) convertView.findViewById(R.id.textView1);
holder.tv2 = (TextView) convertView.findViewById(R.id.textView2);
holder.b1 = (Button) convertView.findViewById(R.id.button1);
holder.b2 = (Button) convertView.findViewById(R.id.button2);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
HashMap<String,String> map = items.get(position);
holder.tv.setText(map.get("key_word"));
holder.tv2.setText(map.get("key_meaning"));
holder.b1.setOnClickListener(mClickListener);
holder.b1.setTag(holder.tv.getText());
holder.b2.setOnClickListener(mClickListener);
holder.b2.setTag(holder.tv2.getText());
return convertView;
}
private OnClickListener mClickListener = new OnClickListener() {
public void onClick(View v) {
switch(v.getId())
{
case R.id.button1 :
Toast.makeText(mContext,"Text is"+v.getTag(),Toast.LENGTH_SHORT).show();
break;
case R.id.button2 :
Toast.makeText(mContext,"Text is"+v.getTag(),Toast.LENGTH_SHORT).show();
break;
}
}
};
static class ViewHolder
{
TextView tv,tv2;
Button b1,b2;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
}
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="16dp"
android:layout_marginTop="36dp"
android:text="TextView" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/textView1"
android:layout_marginLeft="30dp"
android:layout_toRightOf="@+id/textView1"
android:text="Button1" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button1"
android:layout_alignBottom="@+id/button1"
android:layout_marginLeft="25dp"
android:layout_toRightOf="@+id/button1"
android:text="Button2" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button1"
android:layout_toLeftOf="@+id/button1"
android:text="TextView" />
</RelativeLayout>