Android GridView的使用方法
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Android的GridView控件用于把一系列的空間組織成一個二維的網格顯示出來 應用的比較多的就是組合圖片顯示 下面我就詳細講一個例子
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首先寫一個類繼承BaseAdapter
[java]?view plaincopy
public?class?ImageList?extends?BaseAdapter?{??
??????
????????public?Bitmap[]?image;??
????????Activity?activity;??
??????????
????????//?construct??
????????public?ImageList(Activity?a)?{??
????????????activity?=?a;??
????????}??
????????@Override??
????????public?int?getCount()?{??
????????????//?TODO?Auto-generated?method?stub??
????????????return?image.length;??
????????}??
????????@Override??
????????public?Object?getItem(int?position)?{??
????????????//?TODO?Auto-generated?method?stub??
????????????return?image[position];??
????????}??
????????@Override??
????????public?long?getItemId(int?position)?{??
????????????//?TODO?Auto-generated?method?stub??
????????????return?position;??
????????}??
????????public?View?getView(int?position,?View?convertView,?ViewGroup?parent)?{??
????????????//?TODO?Auto-generated?method?stub??
????????????ImageView?imageView;??
????????????if?(convertView?==?null)?{??
????????????????imageView?=?new?ImageView(activity);??
????????????????imageView.setLayoutParams(new?GridView.LayoutParams(50,?50));//?設置ImageView寬高??
????????????????imageView.setAdjustViewBounds(false);??
????????????????imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);??
??????????????????
????????????}?else?{??
????????????????imageView?=?(ImageView)?convertView;??
????????????}??
????????????imageView.setImageBitmap(image[position]);??
??????????????
????????????return?imageView;??
????????}??
????????public?static?Bitmap?drawableToBitmap(Drawable?drawable)?{????
????????????????
????????????Bitmap?bitmap?=?Bitmap????
????????????????????????????.createBitmap(????
????????????????????????????????????????????drawable.getIntrinsicWidth(),????
????????????????????????????????????????????drawable.getIntrinsicHeight(),????
????????????????????????????????????????????drawable.getOpacity()?!=?PixelFormat.OPAQUE???Bitmap.Config.ARGB_8888????
????????????????????????????????????????????????????????????:?Bitmap.Config.RGB_565);????
????????????Canvas?canvas?=?new?Canvas(bitmap);????
????????????drawable.setBounds(0,?0,?drawable.getIntrinsicWidth(),?drawable.getIntrinsicHeight());????
????????????drawable.draw(canvas);????
????????????return?bitmap;????
????}????
????}??
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然后在主程序里
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[c-sharp] view plaincopy
final?GridView?gv?=?(GridView)?findViewById(R.id.grid);??
????????????????ImageList?adapter?=?new?ImageList(available.this);??
????????????????Resources?res=getResources();????
????????????????Bitmap?bmp=BitmapFactory.decodeResource(res,?R.drawable.logo);????
????????????????adapter.image=new?Bitmap[20];??
????????????????for(int?i=0;i<=19;i++)??
????????????????{??
????????????????????adapter.image[i]=bmp;??
????????????????}??
gv.setAdapter(adapter);??
????????????????gv.setOnItemClickListener(new?OnItemClickListener()?{??
????????????????????@Override??
????????????????????public?void?onItemClick(AdapterView<?>?arg0,?View?arg1,??
????????????????????????????int?arg2,?long?arg3)?{??
????????????????????????//?TODO?Auto-generated?method?stub??
????????????????????????Log.i("phb",?arg2?+?"");??
????????????????????????Log.i("phbsel",gv.isFocused()+"");??
????????????????????????Intent?i=new?Intent(available.this,?com.mobile.links.shop.mycx.shopcart.class);??
????????????????????????startActivity(i);??
????????????????????}??
????????????????});??
???????????????gv.setOnItemSelectedListener(new?OnItemSelectedListener(){??
????????????????@Override??
????????????????public?void?onItemSelected(AdapterView<?>?arg0,?View?arg1,??
????????????????????????int?arg2,?long?arg3)?{??
????????????????????//?TODO?Auto-generated?method?stub??
????????????????????Log.i("selected",arg2+"");??
????????????????????tv.setText(arg2+":detail");??
????????????????}??
????????????????@Override??
????????????????public?void?onNothingSelected(AdapterView<?>?arg0)?{??
????????????????????//?TODO?Auto-generated?method?stub??
??????????????????????
????????????????}??
?????????????????????
???????????????});??
??????????????????
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其中onClick函數是判斷被點擊
而onSelect函數是判斷被選中 也就是獲得焦點的imageview
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這樣我們就可以基于gridview來做一些應用了。
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構建gridview的xml代碼
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[c-sharp] view plaincopy
<?xml?version="1.0"?encoding="utf-8"?>??
<LinearLayout??
android:id="@+id/relativelayout"??
android:layout_width="fill_parent"??
android:layout_height="fill_parent"??
xmlns:android="http://schemas.android.com/apk/res/android"??
android:orientation="vertical"??
>??
<GridView?android:id="@+id/availgrid"???
??android:layout_width="fill_parent"???
??android:layout_height="wrap_content"???
??android:numColumns="4"???
??android:verticalSpacing="30dp"???
??android:layout_centerHorizontal?=?"true"??
????
??/>???
???
???
</LinearLayout> ?
轉載于:https://my.oschina.net/1590538xiaokai/blog/338724
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