Android practice simple tutorial-21st gun (GridView dynamic add Item), androidgridview

Android practice simple tutorial-21st gun (GridView dynamic add Item), androidgridview

In this example, an added image is displayed at the end of the GridView, And the content item is dynamically added by clicking the image.

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; // note here} @ 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); // The Last plus image displayed} 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> m Datas; 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, "you clicked to add", 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. Run the project:

You can use the delete function of the previous blog to add and delete dynamically.

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