本文实例讲述了Android实现GridView中ImageView动态变换的方法。分享给大家供大家参考。具体如下：
使用YY影音的时候，发现点击GridView的某一个Item，Item里面的图标会在按下的时候发生变换，变成另外一个图片。
自己写了一个类似的demo，具体步骤如下：
1、创建一个包含Grid的Acitity
2、创建item.xml 里面包含一个imageview和一个textview
3、自定义一个adapter，从baseadapter继承
4、在getView中为每个imageView添加setOnTouchListener
代码入下：
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MainActivity.javapackage com.mygriddemo;import java.util.ArrayList;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.res.Resources;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.util.Log;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageButton;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity { /** Called when the activity is first created. */ private GridView gv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); gv = (GridView) findViewById(R.id.mygrid); AddAdapter addadapter = new AddAdapter(this); gv.setAdapter(addadapter); } public class AddAdapter extends BaseAdapter { private final LayoutInflater mInflater; private final ArrayList<ListItem> mItems = new ArrayList<ListItem>();// public static final int ITEM_SHORTCUT = 0;// public static final int ITEM_APPWIDGET = 1;// public static final int ITEM_LIVE_FOLDER = 2;// public static final int ITEM_WALLPAPER = 3; /** * Specific item in our list. */ public class ListItem { public final CharSequence text; public final Drawable image; //public final int actionTag; public final Drawable touchimage; //, int actionTag public ListItem(Resources res, int textResourceId, int imageResourceId,int touchImageResourceId) { text = res.getString(textResourceId); if (imageResourceId != -1) { image = res.getDrawable(imageResourceId); } else { image = null; } if (touchImageResourceId != -1) { touchimage = res.getDrawable(touchImageResourceId); } else { touchimage = null; } } } public AddAdapter(MainActivity launcher) { super(); mInflater = (LayoutInflater) launcher.getSystemService(Context.LAYOUT_INFLATER_SERVICE); // Create default actions Resources res = launcher.getResources(); mItems.add(new ListItem(res, R.string.item1, R.drawable.item1, R.drawable.item1back)); mItems.add(new ListItem(res, R.string.item2, R.drawable.item2, R.drawable.item2back)); mItems.add(new ListItem(res, R.string.item3, R.drawable.item3, R.drawable.item3back)); mItems.add(new ListItem(res, R.string.item4, R.drawable.item4, R.drawable.item4back)); } public View getView(int position, View convertView, ViewGroup parent) { final ListItem item = (ListItem) getItem(position); if (convertView == null) { convertView = mInflater.inflate(R.layout.grid_item, parent, false); } final TextView textView = (TextView) convertView;//.findViewById(R.id.mygrid); textView.setTag(item); textView.setText(item.text); textView.setCompoundDrawablesWithIntrinsicBounds(null, item.image, null, null); textView.setOnTouchListener(new OnTouchListener(){ public boolean onTouch(View arg0, MotionEvent arg1) { // TODO Auto-generated method stub if (arg1.getAction() == MotionEvent.ACTION_DOWN){ Log.d("WeatherWidget", MotionEvent.ACTION_DOWN+""); textView.setCompoundDrawablesWithIntrinsicBounds(null, item.touchimage, null, null); } else if(arg1.getAction() == MotionEvent.ACTION_UP) { Log.d("WeatherWidget", arg1.getAction()+""); textView.setCompoundDrawablesWithIntrinsicBounds(null, item.image, null, null); Intent i = new Intent(MainActivity.this,Page1Activity.class); startActivity(i); } return true; } }); return convertView; } public int getCount() { return mItems.size(); } public Object getItem(int position) { return mItems.get(position); } public long getItemId(int position) { return position; } }} |
main.xml代码：
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<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><GridView android:id="@+id/mygrid" android:layout_width="fill_parent" android:layout_height="fill_parent" android:numColumns="2" android:verticalSpacing="10dip" android:horizontalSpacing="10dip" android:stretchMode="columnWidth" android:gravity="center"></GridView></LinearLayout> |
griditem.xml代码：
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<?xml version="1.0" encoding="utf-8"?><?xml version="1.0" encoding="utf-8"?><TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:minHeight="?android:attr/listPreferredItemHeight" android:layout_centerHorizontal="true" android:drawablePadding="14dip" android:paddingLeft="15dip" android:paddingRight="15dip" android:gravity="center_horizontal" /> |
希望本文所述对大家的Android程序设计有所帮助。
