Android實戰簡易教程-第二十一槍（GridView動態添加Item），androidgridview

Android實戰簡易教程-第二十一槍（GridView動態添加Item），androidgridview

本例子實現在GridView的最後顯示一個增加圖片，點擊圖片動態增加內容item。

1.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" >    <GridView        android:id="@+id/gv_test"        android:numColumns="3"        android:layout_width="match_parent"        android:layout_height="match_parent" /></RelativeLayout>

2.grid_item.xml：

<?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" >    <ImageView        android:id="@+id/item"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>

3.GridViewAdapter.java:

package com.yayun.gridviewdemo;import java.util.List;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;public class GridViewAdapter extends BaseAdapter {private Context context;private List<Integer> list;LayoutInflater layoutInflater;private ImageView mImageView;public GridViewAdapter(Context context, List<Integer> list) {this.context = context;this.list = list;layoutInflater = LayoutInflater.from(context);}@Overridepublic int getCount() {return list.size()+1;//注意此處}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {convertView = layoutInflater.inflate(R.layout.grid_item, null);mImageView = (ImageView) convertView.findViewById(R.id.item);if (position < list.size()) {mImageView.setBackgroundResource(list.get(position));}else{mImageView.setBackgroundResource(R.drawable.pic3);//最後一個顯示加號圖片}return convertView;}}

4.MainActivity.java:

package com.yayun.gridviewdemo;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.GridView;import android.widget.Toast;public class MainActivity extends ActionBarActivity {private List<Integer> mDatas;private GridView mGridView;private GridViewAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mGridView=(GridView) findViewById(R.id.gv_test);initDatas();adapter=new GridViewAdapter(MainActivity.this,mDatas);mGridView.setAdapter(adapter);mGridView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {if(position==parent.getChildCount()-1){mDatas.add(R.drawable.pic1);Toast.makeText(MainActivity.this, "您點擊了添加", 1).show();adapter=new GridViewAdapter(MainActivity.this, mDatas);mGridView.setAdapter(adapter);adapter.notifyDataSetChanged();}}});}private void initDatas() {mDatas=new ArrayList<>();mDatas.add(R.drawable.pic1);mDatas.add(R.drawable.pic1);mDatas.add(R.drawable.pic1);mDatas.add(R.drawable.pic1);mDatas.add(R.drawable.pic1);}}

5.運行項目：

參考上一篇部落格的刪除，可以實現動態增加和動態刪除功能。

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