在 MainActivity 中有 onItemClick，Activity 实现了 OnItemClickListener。一切都很简单，这个监听器的结果是当用户触摸 ListView 的一个项目时，在屏幕上打印一条 Toas 消息。但是onItemClick函数不起作用，为什么？[logCat 没有错误] 在此先感谢。
这是我的主要活动代码：
package com.prendonota;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;
import com.prendonota.activeRecord.Nota;
import com.prendonota.crud.NotaCrud;
public class MainActivity extends Activity implements OnItemClickListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//*** identifico la ListView che ho usato nell'xml
ListView listView = (ListView)findViewById(R.id.listaNote);
//*** accedo al DB per prendere le note
NotaCrud crud = new NotaCrud(this);
List<Nota> listaNote = crud.getListNotes();
//*** tramite il custom adapter inserisco ogni nota nel relativo item
ListaNotaAdapter adattatore = new ListaNotaAdapter(this, R.layout.row, listaNote);
//*** inserisco l'adapter personalizzato appena popolato nella ListView iniziale
listView.setAdapter(adattatore);
listView.setOnItemClickListener(this);
}
@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;
}
public void addNote(View view){
Log.i(this.getClass().toString(), "addNote()");
Intent intent = new Intent( this, InsertNoteActivity.class );
startActivity(intent);
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
Log.i(this.getClass().toString(), "onItemClick: +++ log +++");
Toast.makeText( this, "Hello world", Toast.LENGTH_SHORT ).show();
}
}
我的activity_main.xml：
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<Button
android:id="@+id/add_nota"
android:onClick="addNote"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="@string/add_nota_label" />
<ListView
android:id="@+id/listaNote"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_below="@id/add_nota" >
</ListView>
</RelativeLayout>
我的 row.xml 用于适配器的每个项目：
<?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">
<!--*** PARTE SUPERIORE ***-->
<RelativeLayout
android:id="@+id/button_row_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFEC9">
<ImageButton
android:id="@+id/button_row_delete"
android:onClick="crudClick"
android:layout_width="35dp"
android:layout_height="30dp"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:contentDescription="@string/icon_delete"
android:src="@android:drawable/ic_menu_delete"/>
<ImageButton
android:id="@+id/button_row_edit"
android:onClick="crudClick"
android:layout_width="35dp"
android:layout_height="30dp"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/button_row_delete"
android:contentDescription="@string/icon_edit"
android:src="@android:drawable/ic_menu_edit" />
<TextView
android:id="@+id/item_data"
android:layout_width="20dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:textIsSelectable="true"
android:layout_toLeftOf="@+id/button_row_edit"
android:padding="10dip"
android:textSize="12sp" />
</RelativeLayout>
<!--*** /PARTE SUPERIORE ***-->
<!--*** PARTE INFERIORE ***-->
<RelativeLayout
android:id="@+id/oggetto_row_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FCFBB5">
<TextView
android:id="@+id/item_oggetto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dip"
android:textSize="18sp"
android:paddingTop="5dp"/>
</RelativeLayout>
<!--*** /PARTE INFERIORE ***-->
</LinearLayout>