android的ListView点击item使item展开的做法 _ListView

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直接上代码把。主要是又一次给item measure高度，直接上代码把

import java.util.ArrayList; import android.app.Activity; import android.os.Bundle; 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.ArrayAdapter; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.RelativeLayout; import android.widget.TextView; public class MainActivity extends Activity { private ArrayList< MyData> myList = new ArrayList< MyData> (); private myAdapter myAdapter; private LayoutInflater inflater = null; private int oldPostion = -1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final ListView list = (ListView) findViewById(R.id.draggable_list); MyData data = https://www.songbingjia.com/android/new MyData(); data.name ="11"; myList.add(data); data = https://www.songbingjia.com/android/new MyData(); data.name ="22"; myList.add(data); data = https://www.songbingjia.com/android/new MyData(); data.name ="33"; myList.add(data); data = https://www.songbingjia.com/android/new MyData(); data.name ="44"; myList.add(data); data = https://www.songbingjia.com/android/new MyData(); data.name ="55"; myList.add(data); data = https://www.songbingjia.com/android/new MyData(); data.name ="66"; myList.add(data); data = https://www.songbingjia.com/android/new MyData(); data.name ="77"; myList.add(data); inflater = LayoutInflater.from(this); TextView header = (TextView)inflater.inflate(R.layout.header, null); TextView footer = (TextView)inflater.inflate(R.layout.footer, null); //list.addFooterView(footer); //list.addHeaderView(header); myAdapter = new myAdapter(); list.setAdapter(myAdapter); list.setOnItemClickListener(new OnItemClickListener() {@Override public void onItemClick(AdapterView< ?> parent, View view, int position, long id) { MyData data = https://www.songbingjia.com/android/myList.get(position); if (oldPostion == position) { if (data.expand){ oldPostion = -1; } data.expand = !data.expand; }else{ oldPostion = position; data.expand = true; }int totalHeight = 0; for(int i=0; i< myAdapter.getCount(); i++) { View viewItem = myAdapter.getView(i, null, list); //这个非常重要。那个展开的item的measureHeight比其它的大 viewItem.measure(0, 0); totalHeight += viewItem.getMeasuredHeight(); }ViewGroup.LayoutParams params = list.getLayoutParams(); params.height = totalHeight + (list.getDividerHeight() * (list.getCount() - 1)); list.setLayoutParams(params); myAdapter.notifyDataSetChanged(); } }); Button btn = (Button)findViewById(R.id.btn); btn.setOnClickListener(new View.OnClickListener() {@Override public void onClick(View v) {} }); } private class myAdapter extends BaseAdapter{@Override public int getCount() { return myList.size(); }@Override public Object getItem(int position) { return myList.get(position); }@Override public long getItemId(int position) { return position; }@Override public View getView(int position, View convertView, ViewGroup parent) {MyTag tag = new MyTag(); MyData data = myList.get(position); if(convertView == null) { convertView = inflater.inflate(R.layout.item_layout, null); tag.item1 = (TextView)convertView.findViewById(R.id.item1); tag.item2 = (RelativeLayout)convertView.findViewById(R.id.item2); convertView.setTag(tag); }else{ tag = (MyTag)convertView.getTag(); } if(data.expand) { tag.item2.setVisibility(View.VISIBLE); }else{ tag.item2.setVisibility(View.GONE); }tag.item1.setText(data.name); return convertView; } } private class MyTag{ private TextView item1; private RelativeLayout item2; } private class MyData{ boolean expand; String name; } }

Layout:

< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="50dp" > < TextView android:id="@+id/item1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:layout_centerHorizontal="true" android:gravity="center" android:text="Header" android:textColor="#000000" android:textSize="20sp" > < /TextView> < RelativeLayout android:id="@+id/item2" android:layout_below="@id/item1" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="35dp" android:background="#fffeee" android:visibility="gone" > < TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:gravity="center" android:text="Expand" android:textColor="#000000" android:textSize="16sp" > < /TextView> < /RelativeLayout> < /RelativeLayout>

效果图: