1.實(shí)現(xiàn)如圖所示的單選效果

由于Android提供的單選按鈕radiobutton只能單行或單列顯示,且樣式并不美觀,故可用GridView進(jìn)行改造,實(shí)現(xiàn)單選效果,而要實(shí)現(xiàn)這樣的效果重點(diǎn)就在GridView的適配器這塊了。
首先是GridView的item的XML:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <RelativeLayout android:id="@+id/options" android:layout_width="match_parent" android:layout_height="143dp"> <ImageView android:id="@+id/imageView" android:layout_width="65dp" android:layout_height="65dp"/> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="通訊錄"/> </RelativeLayout></LinearLayout>
里邊很簡(jiǎn)單,就只用來(lái)放顯示選中效果的imageView和文字的textView
接下來(lái)是適配器:
public class GridViewRadioAdapter extends BaseAdapter { private Context mContext; private int lastPosition = -1; //記錄上一次選中的圖片位置,默認(rèn)不選中 private String[] str = null; //放問(wèn)題內(nèi)容文字的數(shù)組 public GridViewRadioAdapter(Context mContext) { this.mContext = mContext; } public void setStr(String[] str){ //在activity中調(diào)用此方法傳入問(wèn)題的數(shù)組 this.str = str; } public void setSelection(int position) { //在activity中GridView的onItemClickListener中調(diào)用此方法,來(lái)設(shè)置選中位置 lastPosition = position; } @Override public int getCount() { return str.length; } @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) { ViewHolder viewHolder = null; if (convertView == null){ viewHolder = new ViewHolder(); convertView = LayoutInflater.from(mContext).inflate(R.layout.adapter_gridview_radio_item, null); viewHolder.textView = (TextView) convertView.findViewById(R.id.textView); viewHolder.imageView = (ImageView) convertView.findViewById(R.id.imageView); viewHolder.relativeLayout = (RelativeLayout) convertView.findViewById(R.id.options); convertView.setTag(viewHolder); }else { viewHolder = (ViewHolder) convertView.getTag(); } viewHolder.textView.setText(str[position]); if (lastPosition == position){ //判斷是否為選中項(xiàng),選中項(xiàng)與非選中項(xiàng)設(shè)置不同的樣式 switch (position){ //選中狀態(tài)下設(shè)置樣式 case 0: viewHolder.imageView.setBackgroundResource(R.drawable.option_a_checked); break; case 1: viewHolder.imageView.setBackgroundResource(R.drawable.option_b_checked); break; case 2: viewHolder.imageView.setBackgroundResource(R.drawable.option_c_checked); break; case 3: viewHolder.imageView.setBackgroundResource(R.drawable.option_d_checked); break; } viewHolder.relativeLayout.setBackgroundResource(R.drawable.shape_rect_orange); }else { //非選中狀態(tài)下設(shè)置樣式 switch (position){ case 0: viewHolder.imageView.setBackgroundResource(R.drawable.option_a); break; case 1: viewHolder.imageView.setBackgroundResource(R.drawable.option_b); break; case 2: viewHolder.imageView.setBackgroundResource(R.drawable.option_c); break; case 3: viewHolder.imageView.setBackgroundResource(R.drawable.option_d); break; } viewHolder.relativeLayout.setBackgroundResource(R.drawable.shape_rect_gray); } return convertView; } class ViewHolder{ private TextView textView; private ImageView imageView; private RelativeLayout relativeLayout; }}最后在activity中設(shè)置適配器:
GridViewRadioAdapter adapter = new GridViewRadioAdapter(mContext);adapter.setStr(options); //傳入問(wèn)題的選項(xiàng)mGridView.setAdapter(adapter);mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) { adapter.setSelection(position); //傳值更新 adapter.notifyDataSetChanged(); //每一次點(diǎn)擊通知adapter重新渲染 }}); 以上就是本文的全部?jī)?nèi)容,希望本文的內(nèi)容對(duì)大家的學(xué)習(xí)或者工作能帶來(lái)一定的幫助,同時(shí)也希望多多支持VEVB武林網(wǎng)!
新聞熱點(diǎn)
疑難解答
圖片精選
網(wǎng)友關(guān)注