Android實現GridView中ImageView動態變換的方法_Android

本文執行個體講述了Android實現GridView中ImageView動態變換的方法。分享給大家供大家參考。具體如下：

使用YY影音的時候，發現點擊GridView的某一個Item，Item裡面的表徵圖會在按下的時候發生變換，變成另外一個圖片。

自己寫了一個類似的demo，具體步驟如下：

1、建立一個包含Grid的Acitity
2、建立item.xml 裡麵包含一個imageview和一個textview
3、自訂一個adapter，從baseadapter繼承
4、在getView中為每個imageView添加setOnTouchListener

代碼入下：

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代碼：

<?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代碼：

<?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" />

希望本文所述對大家的Android程式設計有所協助。