Android 實現ListView item的左滑（右滑）監聽事件 swipemenulistview
阿新 • • 發佈：2019-01-07
這篇文章將會介紹我是如何學習item的左滑監聽事件設定的，首先我們先新增依賴:
compile ‘com.baoyz.swipemenulistview:library:1.3.+’
可以看到，我們是藉助大神所寫的swipemenulistView這個空間來實現我們的左滑事件的。匯入之後呢，我們就可以開始我們的專案了。
首先和往常寫listView寫好我們的佈局檔案，但是以前所有的listView控制元件就需要我們使用這一款新的控制元件代替了。
main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 接下來是我們的item佈局檔案:
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/nameTextView"
android:textSize="20sp"
android:layout_width="match_parent"
android:layout_height="40dp" />
<TextView
android:id="@+id/ageTextView"
android:textSize="15sp"
android:layout_width="match_parent"
android:layout_height="40dp" />
</LinearLayout>然後程式碼部分，還是需要我們自己去建立介面卡，以及寫一個數據類來存放需要顯示的資料。這和以前我們寫listView的思想一樣，接下來我們直接放程式碼吧。
資料類Person:
public class Person {
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public Person(){
}
String name ;
String age;
}item 的AppView類:
public class AppView extends LinearLayout {
private Context context;
private TextView nameTextView;
private TextView ageTextView;
public AppView(Context context) {
super(context);
this .context = context;
init(context);
}
public void init(Context context){
this.context = context;
View view = LayoutInflater.from(this.context).inflate(R.layout.listview_item,null);
nameTextView = (TextView) view .findViewById(R.id.nameTextView);
ageTextView = (TextView) view.findViewById(R.id.ageTextView);
addView(view);
}
public void updateView(Person person){
nameTextView.setText(person.getName());
ageTextView.setText(person.getAge());
}
}Adapter:
public class ListViewAdapter extends BaseAdapter {
private Context context;
private List<Person> infos;
public ListViewAdapter(Context context, List<Person> infos){
this.context =context;
this.infos=infos;
}
public int getCount() {
return infos.size();
}
@Override
public Object getItem(int i) {
return infos.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
if(infos==null){
return null;
}
if(view==null){
AppView appView = new AppView(context);
appView.updateView(infos.get(i));
view = appView;
view.setTag(appView);
}else{
view = (View) view.getTag();
}
return view;
}
}接下來就是比較重要，也是比較關鍵的MainActivity類了.
package com.example.administrator.learnlistviewmenu;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.TypedValue;
import android.widget.Toast;
import com.baoyz.swipemenulistview.SwipeMenu;
import com.baoyz.swipemenulistview.SwipeMenuCreator;
import com.baoyz.swipemenulistview.SwipeMenuItem;
import com.baoyz.swipemenulistview.SwipeMenuListView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
List<Person> infos = new ArrayList<Person>();
SwipeMenuCreator creator = new SwipeMenuCreator() {
@Override
public void create(SwipeMenu menu) {
//create open item
SwipeMenuItem openItem = new SwipeMenuItem(getApplicationContext());
//set backg
openItem.setBackground(new ColorDrawable(Color.rgb(0xC9, 0xC9,
0xCE)));
openItem.setWidth(dip2px(MainActivity.this,90));
openItem.setTitle("Open");
openItem.setTitleSize(18);
openItem.setTitleColor(Color.WHITE);
menu.addMenuItem(openItem);
SwipeMenuItem deleteItem = new SwipeMenuItem(
getApplicationContext());
// set item background
deleteItem.setBackground(new ColorDrawable(Color.rgb(0xF9,
0x3F, 0x25)));
// set item width
deleteItem.setWidth(dip2px(MainActivity.this,90));
// set a icon
deleteItem.setIcon(R.mipmap.ic_launcher);
// add to menu
menu.addMenuItem(deleteItem);
}
};
SwipeMenuListView listView;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loadDada();
ListViewAdapter adapter = new ListViewAdapter(this,infos);
listView = (SwipeMenuListView) findViewById(R.id.listView);
listView.setMenuCreator(creator);
listView.setSwipeDirection(SwipeMenuListView.DIRECTION_LEFT);
listView.setAdapter(adapter);
listView.setOnMenuItemClickListener(new SwipeMenuListView.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(int position, SwipeMenu menu, int index) {
switch (index){
case 0:
Toast.makeText(MainActivity.this, "open", Toast.LENGTH_SHORT).show();
break;
case 1:
Toast.makeText(MainActivity.this, "delete", Toast.LENGTH_SHORT).show();
break;
}
return false;
}
});
}
public void loadDada(){
for(int i = 0 ;i<=20;i++){
Person x = new Person();
x.setName("my name is "+i);
x.setAge("my age is "+i);
infos.add(x);
}
}
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
/**
* px2dp
*/
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
/**
*根據裝置資訊獲取當前解析度下指定單位對應的畫素大小；
* px,dip,sp -> px
*/
public float getRawSize(Context c, int unit, float size) {
Resources r;
if (c == null){
r = Resources.getSystem();
}else{
r = c.getResources();
}
return TypedValue.applyDimension(unit, size, r.getDisplayMetrics());
}
}這裡面可以看到，我們的控制元件設定屬性：
SwipeMenuCreator creator = new SwipeMenuCreator() {
@Override
public void create(SwipeMenu menu) {
//create open item
SwipeMenuItem openItem = new SwipeMenuItem(getApplicationContext());
//set backg
openItem.setBackground(new ColorDrawable(Color.rgb(0xC9, 0xC9,
0xCE)));
openItem.setWidth(dip2px(MainActivity.this,90));
openItem.setTitle("Open");
openItem.setTitleSize(18);
openItem.setTitleColor(Color.WHITE);
menu.addMenuItem(openItem);
SwipeMenuItem deleteItem = new SwipeMenuItem(
getApplicationContext());
// set item background
deleteItem.setBackground(new ColorDrawable(Color.rgb(0xF9,
0x3F, 0x25)));
// set item width
deleteItem.setWidth(dip2px(MainActivity.this,90));
// set a icon
deleteItem.setIcon(R.mipmap.ic_launcher);
// add to menu
menu.addMenuItem(deleteItem);
}
};這一款程式碼就是我們設定的屬性，說白了就是設定的左滑後顯示的item的屬性，這裡我們可以自己去設定他的圖片背景，大小以及title,這裡設定好之後，在後面新增監聽後的方法中就可以去寫相應的觸發事件了.
listView.setMenuCreator(creator);
listView.setSwipeDirection(SwipeMenuListView.DIRECTION_LEFT);
listView.setAdapter(adapter);
listView.setOnMenuItemClickListener(new SwipeMenuListView.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(int position, SwipeMenu menu, int index) {
switch (index){
case 0:
Toast.makeText(MainActivity.this, "open", Toast.LENGTH_SHORT).show();
break;
case 1:
Toast.makeText(MainActivity.this, "delete", Toast.LENGTH_SHORT).show();
break;
}
return false;
}
});
}在使用的時候，我們必須傳入最開始設定好的creator然後選擇Direction，然後新增監聽之後，我們就是通過switch判斷index來，判斷點選的具體的左滑item功能按鈕.完成相應的方法。
這大概就是swipemenulistview的初使用了，本片文章只是記錄學習過程，有很多不規範和有問題的寫法的話。請大神勿噴啊