android ListView點選item刪除事件的實現
2016 -10 -12 修改
之前只是為自己做個筆記，沒想到還挺多人需要這個，現在對程式碼進行了優化，並附上原始碼，希望能夠幫助到需要的同行
activity_main:
<LinearLayout 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:orientation="vertical"
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" >
<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
</ListView>
<Button
android:id="@+id/add"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="add" />
</LinearLayout>
---------------------------------------------------------------
message_item
<LinearLayout 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:orientation="vertical"
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" >
<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
</ListView>
<Button
android:id="@+id/add"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="add" />
</LinearLayout>
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package com.example.yangyoulistviewadddelete;
import java.util.ArrayList;
import com.example.yangyoulistviewadddelete.MessageAdapter.DeleteCallback;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
public class MainActivity extends Activity implements OnClickListener,
DeleteCallback {
private ListView lv;
private Button add;
ArrayList<String> data = new ArrayList<String>();
int count ;
private MessageAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.lv);
add = (Button) findViewById(R.id.add);
adapter = new MessageAdapter(this);
adapter.setData(data);
adapter.setDeleteCallback(this);
lv.setAdapter(adapter);
add.setOnClickListener(this);
}
@Override
public void onClick(View v) {
count = count+1;
data.add("A" + count);
adapter.setData(data);
adapter.notifyDataSetInvalidated();
}
@Override
public void deletePosition(int position) {
data.remove(position);
adapter.setData(data);
adapter.notifyDataSetInvalidated();
}
}
-----------------------------------------------------------------------------------------------------------------------------------
package com.example.yangyoulistviewadddelete;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
public class MessageAdapter extends BaseAdapter {
private ArrayList<String> data;
private LayoutInflater mInflater;
private int saveposition;
private DeleteCallback Callback;
public MessageAdapter(Context context) {
this.mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup arg2) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.message_item, null);
holder.name = (TextView) convertView.findViewById(R.id.tv_titel);
holder.viewBtn = (Button) convertView.findViewById(R.id.bt_delete);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText(data.get(position));
holder.viewBtn.setTag(position);// TODO 這裡是關鍵
holder.viewBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
saveposition = Integer.parseInt(v.getTag().toString());// TODO
Callback.deletePosition(saveposition);
}
});
return convertView;
}
// 提取出來方便點
public final class ViewHolder {
public TextView name;
public Button viewBtn;
}
public interface DeleteCallback {
void deletePosition(int saveposition);
}
public void setDeleteCallback(DeleteCallback Callback ){
this.Callback=Callback;
}
public void setData(ArrayList<String> data2) {
this.data=data2;
}
}
/**
* ListView 與ScrollView 佈局巢狀 高度計算工具類
*
*/
public class ListViewAdapterUtil {
public static void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
// pre-condition
return;
}
int totalHeight = 0;
if(listAdapter.getCount() == 0){
return;
}else{
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
listView.setLayoutParams(params);
}
}
}
原始碼下載地址 http://download.csdn.net/detail/anroidyanyou/9651567