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  • ExpandableListView(可展开的列表组件)使用方法

    package com.example.expandablelist;
    
    import android.os.Bundle;
    import android.app.Activity;
    import android.view.Gravity;
    import android.view.Menu;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.AbsListView;
    import android.widget.BaseExpandableListAdapter;
    import android.widget.ExpandableListAdapter;
    import android.widget.ExpandableListView;
    import android.widget.TextView;
    
    public class MainActivity extends Activity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            ExpandableListAdapter adapter = new BaseExpandableListAdapter() {
                private String[] group = new String[]
                        {"G1","G2","G3"};
                private String[][] child = new String[][]
                        {{"g1c1","g1c2","g1c3"},
                         {"g2c1","g2c2","g2c3"},
                         {"g3c1","g3c2","g3c3"}
                        
                        };
                @Override
                public boolean isChildSelectable(int groupPosition, int childPosition) {
                    // TODO Auto-generated method stub
                    return true;
                }
                
                @Override
                public boolean hasStableIds() {
                    // TODO Auto-generated method stub
                    return false;
                }
                
                @Override
                public View getGroupView(int groupPosition, boolean isExpanded,
                        View convertView, ViewGroup parent) {
                    // TODO Auto-generated method stub
                    TextView textview =getTextView();
                    textview.setText(getGroup(groupPosition).toString());
                    return textview;
                }
                
                @Override
                public long getGroupId(int groupPosition) {
                    // TODO Auto-generated method stub
                    return groupPosition;
                }
                
                @Override
                public int getGroupCount() {
                    // TODO Auto-generated method stub
                    return group.length;
                }
                
                @Override
                public Object getGroup(int groupPosition) {
                    // TODO Auto-generated method stub
                    return group[groupPosition];
                }
                
                @Override
                public int getChildrenCount(int groupPosition) {
                    // TODO Auto-generated method stub
                    return child[groupPosition].length;
                }
                
                @Override
                public View getChildView(int groupPosition, int childPosition,
                        boolean isLastChild, View convertView, ViewGroup parent) {
                    // TODO Auto-generated method stub
                    TextView textview = getTextView();
                    textview.setText(getChild(groupPosition, childPosition).toString());
                    return textview;
                }
                
                private TextView getTextView() {
                    // TODO Auto-generated method stub
                    AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,64);
                    TextView textview = new TextView(MainActivity.this);
                    textview.setLayoutParams(lp);
                    textview.setGravity(Gravity.CENTER_VERTICAL|Gravity.LEFT);
                    textview.setPadding(36,0,0,0);
                    textview.setTextSize(20);
                    return textview; 
                }
    
                @Override
                public long getChildId(int groupPosition, int childPosition) {
                    // TODO Auto-generated method stub
                    return childPosition;
                }
                
                @Override
                public Object getChild(int groupPosition, int childPosition) {
                    // TODO Auto-generated method stub
                    return child[groupPosition][childPosition];
                }
            };
            ExpandableListView expandListView=(ExpandableListView)findViewById(R.id.list);
            expandListView.setAdapter(adapter);
        }
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.activity_main, menu);
            return true;
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/seantown/p/2821671.html
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