Android小記:ListView中的按鈕點選響應事件
阿新 • • 發佈:2019-01-22
在Adapter中定義一個回撥介面,在Activity中實現該介面,從而實現對點選事件的響應。
有兩種方式都能比較好的實現:使用介面回撥和使用抽象類回撥
1.使用介面回撥:
Adapter類:
package com.ivan.adapter;
import java.util.List;
import android.content.Context;
import android.util.Log;
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;
import com.ivan.listvieweventcallback.R;
public class ContentAdapter extends BaseAdapter implements OnClickListener {
private static final String TAG = "ContentAdapter";
private List<String> mContentList;
private LayoutInflater mInflater;
private MyCallback mCallback;
public ContentAdapter(Context context, List<String> contentList,
MyCallback callback) {
mContentList = contentList;
mInflater = LayoutInflater.from(context);
mCallback = callback;
}
@Override
public int getCount() {
Log.i(TAG, "getCount");
return mContentList.size();
}
@Override
public Object getItem(int position) {
Log.i(TAG, "getItem");
return mContentList.get(position);
}
@Override
public long getItemId(int position) {
Log.i(TAG, "getItemId");
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Log.i(TAG, "getView");
ViewHolder holder = null;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
holder = new ViewHolder();
holder.textView = (TextView) convertView
.findViewById(R.id.textView1);
holder.button = (Button) convertView.findViewById(R.id.button1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(mContentList.get(position));
holder.button.setOnClickListener(this);
holder.button.setTag(position);
return convertView;
}
public class ViewHolder {
public TextView textView;
public Button button;
}
// 響應按鈕點選事件,呼叫子定義介面,並傳入View
@Override
public void onClick(View v) {
mCallback.click(v);
}
}
自定義介面:
/**
* 自定義介面,用於回撥按鈕點選事件到Activity
*/
public interface MyCallback {
public void click(View v);
}
Activity類:
package com.ivan.listvieweventdemo;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
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.ivan.adapter.ContentAdapter;
import com.ivan.adapter.ContentAdapter.Callback;
import com.ivan.listvieweventcallback.R;
//MainActivity需要實現自定義介面
public class MainActivity extends Activity implements OnItemClickListener,
MyCallback {
// 模擬listview中載入的資料
private static final String[] CONTENTS = { "北京", "上海", "廣州", "深圳", "蘇州",
"南京", "武漢", "長沙", "杭州" };
private List<String> contentList;
private ListView mListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
mListView = (ListView) findViewById(R.id.listview);
contentList = new ArrayList<String>();
for (int i = 0; i < CONTENTS.length; i++) {
contentList.add(CONTENTS[i]);
}
//
mListView.setAdapter(new ContentAdapter(this, contentList, this));
mListView.setOnItemClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/**
* 響應ListView中item的點選事件
*/
@Override
public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {
Toast.makeText(this, "listview的item被點選了!,點選的位置是-->" + position,
Toast.LENGTH_SHORT).show();
}
/**
* 介面方法,響應ListView按鈕點選事件
*/
@Override
public void click(View v) {
Toast.makeText(
MainActivity.this,
"listview的內部的按鈕被點選了!,位置是-->" + (Integer) v.getTag() + ",內容是-->"
+ contentList.get((Integer) v.getTag()),
Toast.LENGTH_SHORT).show();
}
}
2.使用抽象類回撥:
Adapter類:
package com.ivan.adapter;
import java.util.List;
import android.content.Context;
import android.util.Log;
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;
import com.ivan.listvieweventabstract.R;
public class ContentAdapter extends BaseAdapter {
private static final String TAG = "ContentAdapter";
private List<String> mContentList;
private LayoutInflater mInflater;
private MyClickListener mListener;
public ContentAdapter(Context context, List<String> contentList,
MyClickListener listener) {
mContentList = contentList;
mInflater = LayoutInflater.from(context);
mListener = listener;
}
@Override
public int getCount() {
Log.i(TAG, "getCount");
return mContentList.size();
}
@Override
public Object getItem(int position) {
Log.i(TAG, "getItem");
return mContentList.get(position);
}
@Override
public long getItemId(int position) {
Log.i(TAG, "getItemId");
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Log.i(TAG, "getView");
ViewHolder holder = null;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
holder = new ViewHolder();
holder.textView = (TextView) convertView
.findViewById(R.id.textView1);
holder.button = (Button) convertView.findViewById(R.id.button1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(mContentList.get(position));
holder.button.setOnClickListener(mListener);
holder.button.setTag(position);
return convertView;
}
public class ViewHolder {
public TextView textView;
public Button button;
}
/**
* 用於回撥的抽象類
*/
public static abstract class MyClickListener implements OnClickListener {
/**
* 基類的onClick方法
*/
@Override
public void onClick(View v) {
myOnClick((Integer) v.getTag(), v);
}
public abstract void myOnClick(int position, View v);
}
}
Activity類:
package com.ivan.listvieweventdemo;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
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.ivan.adapter.ContentAdapter;
import com.ivan.adapter.ContentAdapter.MyClickListener;
import com.ivan.listvieweventabstract.R;
public class MainActivity extends Activity implements OnItemClickListener {
// 模擬listview中載入的資料
private static final String[] CONTENTS = { "北京", "上海", "廣州", "深圳", "蘇州",
"南京", "武漢", "長沙", "杭州" };
private List<String> contentList;
private ListView mListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
mListView = (ListView) findViewById(R.id.listview);
contentList = new ArrayList<String>();
for (int i = 0; i < CONTENTS.length; i++) {
contentList.add(CONTENTS[i]);
}
//例項化ContentAdapter類,並傳入實現類
mListView.setAdapter(new ContentAdapter(this, contentList, mListener));
mListView.setOnItemClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
//響應item點選事件
@Override
public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {
Toast.makeText(this, "listview的item被點選了!,點選的位置是-->" + position,
Toast.LENGTH_SHORT).show();
}
/**
* 實現類,響應按鈕點選事件
*/
private MyClickListener mListener = new MyClickListener() {
@Override
public void myOnClick(int position, View v) {
Toast.makeText(
MainActivity.this,
"listview的內部的按鈕被點選了!,位置是-->" + position + ",內容是-->"
+ contentList.get(position), Toast.LENGTH_SHORT)
.show();
}
};
}
佈局檔案:
<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" >
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
</RelativeLayout>
<?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="wrap_content"
android:descendantFocusability="blocksDescendants"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="content"
android:textColor="#ff0000"
android:textSize="20sp" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false"
android:text="Button"
android:textColor="#ff0000"
android:textSize="20sp" />
</LinearLayout>
Android listview介面卡裡區分不同按鈕的點選事件
1.介面卡 ListItemClickAdapter
public class ListItemClickAdapter extends BaseAdapter {
private Context contxet;
private ArrayList<string> list;
private ListItemClickHelp callback;
private LayoutInflater mInflater;
public ListItemClickAdapter(Context contxet, ArrayList<string> list,
ListItemClickHelp callback) {
this.contxet = contxet;
this.list = list;
this.callback = callback;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, final ViewGroup parent) {
mInflater = (LayoutInflater) contxet
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.block_list_item, null);
holder = new ViewHolder();
holder.mAd_tv_show = (TextView) convertView
.findViewById(R.id.ad_tv_show);
holder.mAd_btn_one = (Button) convertView
.findViewById(R.id.ad_btn_one);
holder.mAd_btn_two = (Button) convertView
.findViewById(R.id.ad_btn_two);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.mAd_tv_show.setText(list.get(position));
final View view = convertView;
final int p = position;
final int one = holder.mAd_btn_one.getId();
holder.mAd_btn_one.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
callback.onClick(view, parent, p, one);
}
});
final int two = holder.mAd_btn_two.getId();
holder.mAd_btn_two.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
callback.onClick(view, parent, p, two);
}
});
return convertView;
}
public static class ViewHolder {
TextView mAd_tv_show;
Button mAd_btn_one;
Button mAd_btn_two;
}
2.介面 ListItemClickHelp
/**
* listview點選事件介面
*/
publicinterfaceListItemClickHelp {
voidonClick(View item, View widget, intposition,intwhich);
}
3.介面 MainActivity
publicclassMainActivityextendsActivityimplementsListItemClickHelp {
privateTextView mtv_show;
privateListView mlv_show;
privateArrayList<string> mdata = newArrayList<string>();
privateListItemClickAdapter madapter;
@Override
protectedvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initLayout();
}
privatevoidinitLayout() {
mdata.add("One");
mdata.add("Two");
mdata.add("Three");
mdata.add("Four");
mdata.add("Five");
mdata.add("菠蘿");
mdata.add("蘋果");
mdata.add("葡萄");
mdata.add("哈密瓜");
mdata.add("香蕉");
mtv_show = (TextView) this.findViewById(R.id.tv_show);
mlv_show = (ListView) this.findViewById(R.id.lv_show);
madapter = newListItemClickAdapter(this, mdata, this);
mlv_show.setAdapter(madapter);
mlv_show.setOnItemClickListener(newOnItemClickListener() {
@Override
publicvoidonItemClick(AdapterView<!--?--> adapter, View view,
intposition,longarg3) {
mtv_show.setText(mdata.get(position));
}
});
}
@Override
publicvoidonClick(View item, View widget, intposition,intwhich) {
switch(which) {
caseR.id.ad_btn_one:
mtv_show.setText(mdata.get(position) + "Btn one");
break;
caseR.id.ad_btn_two:
mtv_show.setText(mdata.get(position) + "Btn two");
break;
default:
break;
}
}
}