android 的UI设计有所见即所得的空间可用，设计UI的时候非常方便。我们在设计UI的时候也应该尽量复用，以提高效率。如整个页面都相同，或只是LIST的内容 显示不同，我们应该使用同一个页面，而不应该配置多个页面。但如果只有页面的一部分内容相同，我们又不能公用整个页面，该怎么办呢？ 我们可以对这个模块进行封装，只要在该使用的地方把它引入即可。看个封装gallery的小例子。 1.封装gallery的类： package com.D_galleryPackage; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.content.Intent; import android.util.AttributeSet; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.AdapterView.OnItemClickListener; public class GalleryLayout extends LinearLayout implements OnClickListener, OnItemClickListener{ private Context mContext; private ImageView pre, next; private Gallery mGallery; private int FILL = ViewGroup.LayoutParams.FILL_PARENT; private int WRAP_CONTENT = ViewGroup.LayoutParams.WRAP_CONTENT; private List<Integer> myimage = new ArrayList<Integer>(); public GalleryLayout(Context context, AttributeSet attrs) { super(context, attrs); mContext = context; } public void updateUI(){ myimage.add(R.drawable.coupons_new); myimage.add(R.drawable.profile_ad_icon_new); myimage.add(R.drawable.profile_menu_icon_new); myimage.add(R.drawable.save_icon_new); myimage.add(R.drawable.video_icon_new); pre = new ImageView(mContext); pre.setImageDrawable(getResources().getDrawable(R.drawable.map_point_back)); next = new ImageView(mContext); next.setImageDrawable(getResources().getDrawable(R.drawable.map_point_forward)); mGallery = new Gallery(mContext, null); ImageAdapter adapter = new ImageAdapter(mContext); mGallery.setAdapter(adapter); mGallery.setLayoutParams(new LayoutParams(FILL, WRAP_CONTENT, 1)); setGallerySelection(mGallery); pre.setOnClickListener(this); next.setOnClickListener(this); mGallery.setOnItemClickListener(this); setGravity(Gravity.CENTER); addView(pre); addView(mGallery); addView(next); } private void setGallerySelection(Gallery gallery) { if(myimage.size() >=2){ gallery.setSelection(1); } } @Override public void onClick(View v) { if(v == pre){ int id = (int) mGallery.getSelectedItemId(); if(id > 0 ){ Animation animation = AnimationUtils.loadAnimation(mContext, R.anim.push_left_in); mGallery.setAnimation(animation); mGallery.setAnimationCacheEnabled(true); mGallery.setSelection(--id, true); } }else if (v == next) { int id = (int) mGallery.getSelectedItemId(); if(id < (myimage.size() -1)){ mGallery.setSelection(++id, true); } } } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { new AlertDialog.Builder(mContext).setMessage(String.valueOf(position)).setTitle("gallery Click event").setPositiveButton("==OK==", new DialogInterface.OnClickListener(){ @Override public void onClick(DialogInterface dialog, int which) { } }).show(); } public class ImageAdapter extends BaseAdapter{ private Context myContext; public ImageAdapter(Context c) { myContext = c; } @Override public int getCount() { return myimage.size(); } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView tv = new ImageView(myContext); tv.setImageDrawable(getResources().getDrawable(myimage.get(position))); tv.setPadding(20, 10, 29, 10); tv.setLayoutParams(new Gallery.LayoutParams(WRAP_CONTENT, WRAP_CONTENT )); return tv; } } } 2.UI中引入： <com.D_galleryPackage.GalleryLayout android:layout_gravity="center" android:clickable="false" android:focusable="false" android:l android:id="@+id/galleryLayout" android:layout_height="75dip" android:layout_width="fill_parent" android:background="#fff" /> 3.代码中（要使用gallery的地方，和UI搭配）调用： galleryLayout = (GalleryLayout) findViewById(R.id.galleryLayout); galleryLayout.updateUI();
