package bwie.universaladapter; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { private ListView lv; int[] arr = {R.mipmap.img0, R.mipmap.img1, R.mipmap.img2, R.mipmap.img3, R.mipmap.img4, R.mipmap.img5, R.mipmap.img6, R.mipmap.img7, R.mipmap.img8, R.mipmap.img9}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lv = (ListView) findViewById(R.id.lv); List<Bean> list = new ArrayList<>(); for (int i = 0; i < 10; i++) { list.add(new Bean(arr[i], "zhangsan" + i)); } lv.setAdapter(new CommonAdapter<Bean>(this, list, R.layout.item) { @Override public void convert(ViewHolder helper, Bean bean) { TextView tv = helper.getView(R.id.textViews); tv.setText(bean.text); ImageView image = helper.getView(R.id.images); image.setImageResource(bean.getImage()); } }); } }
package bwie.universaladapter; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import java.util.List; public abstract class CommonAdapter<T> extends BaseAdapter { protected LayoutInflater mInflater; protected Context context; protected List<T> mDatas; protected final int mItemLayoutId; public CommonAdapter(Context context, List<T> mDatas, int mItemLayoutId) { this.mInflater = LayoutInflater.from(context); this.context = context; this.mDatas = mDatas; this.mItemLayoutId = mItemLayoutId; } @Override public int getCount() { return mDatas.size(); } @Override public T getItem(int position) { return mDatas.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { final ViewHolder viewHolder = getViewHolder(position, convertView, parent); convert(viewHolder, getItem(position)); return viewHolder.getConvertView(); } public abstract void convert(ViewHolder helper, T item); private ViewHolder getViewHolder(int position, View convertView, ViewGroup parent) { return ViewHolder.get(context, convertView, parent, mItemLayoutId, position); } }
package bwie.universaladapter; import android.content.Context; import android.util.SparseArray; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class ViewHolder { private final SparseArray<View> mView; private View mConverView; private int mPosition; private ViewHolder(Context context, ViewGroup parent, int layoutId, int position) { this.mView = new SparseArray<>(); mConverView = LayoutInflater.from(context).inflate(layoutId, parent, false); this.mPosition = position; //settag mConverView.setTag(this); } public View getConvertView() { return mConverView; } /** * 拿到一个ViewHolder对象 * * @param context * @param convertView * @param layoutId * @param position * @return */ public static ViewHolder get(Context context, View convertView, ViewGroup parent, int layoutId, int position) { if (convertView == null) { return new ViewHolder(context, parent, layoutId, position); } return (ViewHolder) convertView.getTag(); } /** * 通过控件的Id获取对于的控件,如果没有则加入views * * @param viewId * @param <T> * @return */ public <T extends View> T getView(int viewId) { View view = mView.get(viewId); if (view == null) { view = mConverView.findViewById(viewId); mView.put(viewId, view); } return (T) view; } /** * 为TextView设置字符串 * * @param viewId * @param text * @return */ public ViewHolder setText(int viewId, String text) { TextView tv = getView(viewId); tv.setText(text); return this; } public int getPosition() { return mPosition; } }