上接系出名門Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView

5、ListView 的 Demo
main_list_adapter.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
        自定義列表適配器的 layout
-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="horizontal" android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        
        <TextView android:id="@+id/text" android:layout_width="wrap_content"
                android:layout_height="wrap_content" android:textSize="16sp">
        </TextView>
        
</LinearLayout>

 

MainListAdapter.java

package com.webabcd.view;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

// 繼承 BaseAdapter 以實現自定義的列表適配器
public class MainListAdapter extends BaseAdapter {

        private LayoutInflater mInflater;
        private List<String> mData;

        public MainListAdapter(Context context, List<String> data) {
                mInflater = LayoutInflater.from(context);
                mData = data;
        }

        @Override
        public int getCount() {
                return mData.size();
        }

        @Override
        public Object getItem(int position) {
                return mData.get(position);
        }

        @Override
        public long getItemId(int position) {
                return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

                TextView text;

                if (convertView == null) {
                        // 指定一個 layout 作爲自定義列表適配器的 layout
                        convertView = mInflater.inflate(R.layout.main_list_adapter, null);
                        text = (TextView) convertView.findViewById(R.id.text);
                        convertView.setTag(text);
                } else {
                        text = (TextView) convertView.getTag();
                }
                
                String mItem = mData.get(position);
                text.setText(mItem);
                
                return convertView;
        }
}

 

Main.java

package com.webabcd.view;

import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

// 此處要繼承 ListActivity ，用以實現 ListView 的功能
public class Main extends ListActivity {
        
        private List<String> mData;
        
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);

                setTheme(android.R.style.Theme_Light);
                setContentView(R.layout.main);                
                mData = getData();
                
                // 使用自定義的列表適配器來展現數據
                MainListAdapter adapter = new MainListAdapter(this, mData);
                
                // 如需使用系統內置的列表適配器，則可以使用類似如下的方法
                // ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, mData);
                
                this.setListAdapter(adapter);
        }

        // ListView 的數據源
        private List<String> getData()        {
                List<String> items = new ArrayList<String>();
                
                items.add("TextView");
                items.add("Button");
                items.add("ImageButton");
                items.add("ImageView");
                items.add("CheckBox");
                items.add("RadioButton");
                items.add("AnalogClock");
                items.add("DigitalClock");
                items.add("DatePicker");
                items.add("TimePicker");
                items.add("ToggleButton");
                items.add("EditText");
                items.add("ProgressBar");
                items.add("SeekBar");
                items.add("AutoCompleteTextView");
                items.add("MultiAutoCompleteTextView");
                items.add("ZoomControls");
                items.add("Include");
                items.add("VideoView");
                items.add("WebView");
                items.add("RatingBar");
                items.add("Tab");
                items.add("Spinner");
                items.add("Chronometer");
                items.add("ScrollView");
                items.add("TextSwitcher");
                items.add("ListView");
                items.add("Gallery");
                items.add("ImageSwitcher");
                items.add("GridView");
                items.add("ExpandableList");
                    
                return items;
        }

        // ListView 中某項被選中後的邏輯
        @Override
        protected void onListItemClick(ListView l, View v, int position, long id) {
                Intent intent = new Intent();
                intent.setClassName(this, "com.webabcd.view._" + mData.get(position));

                startActivityForResult(intent, 0);
        }
}

 

 

6、ExpandableList 的 Demo
_ExpandableList.java

package com.webabcd.view;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;

// ExpandableList - 可展開/收縮列表
// 繼承 ExpandableListActivity 以實現列表的可展開/收縮的功能
public class _ExpandableList extends ExpandableListActivity {
        
        private ExpandableListAdapter mAdapter;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                // TODO Auto-generated method stub
                super.onCreate(savedInstanceState);

                setTitle("ExpandableList");
                
                mAdapter = new MyExpandableListAdapter();
                setListAdapter(mAdapter);
                registerForContextMenu(this.getExpandableListView());
        }

        // 爲列表的每一項創建上下文菜單（即長按後呼出的菜單）    
        @Override
        public void onCreateContextMenu(ContextMenu menu, View v,
                        ContextMenuInfo menuInfo) {
                menu.setHeaderTitle("ContextMenu");
                menu.add(0, 0, 0, "ContextMenu");
        }

        // 單擊上下文菜單後的邏輯
        @Override
        public boolean onContextItemSelected(MenuItem item) {
                ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();
                String title = ((TextView) info.targetView).getText().toString();

                int type = ExpandableListView.getPackedPositionType(info.packedPosition);
                if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
                        int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
                        int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);
                        
                        Toast.makeText(this, title + " - Group Index: " + groupPos + " Child Index: " + childPos, Toast.LENGTH_SHORT).show();
                        
                        return true;
                } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
                        int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
                        Toast.makeText(this, title + " - Group Index: " + groupPos, Toast.LENGTH_SHORT).show();
                        
                        return true;
                }

                return false;
        }

        public class MyExpandableListAdapter extends BaseExpandableListAdapter {

                // 父列表數據
                private String[] groups =    
                {    
                        "group1",    
                        "group2",    
                        "group3",
                        "group4"    
                };
                // 子列表數據
                private String[][] children =    
                {
                        { "child1" },
                        { "child1", "child2" },
                        { "child1", "child2", "child3" },
                        { "child1", "child2", "child3", "child4" }
                };
                
                @Override
                public Object getChild(int groupPosition, int childPosition) {
                        return children[groupPosition][childPosition];
                }

                @Override
                public long getChildId(int groupPosition, int childPosition) {
                        return childPosition;
                }

                @Override
                public int getChildrenCount(int groupPosition) {
                        return children[groupPosition].length;
                }

                // 取子列表中的某一項的 View
                @Override
                public View getChildView(int groupPosition, int childPosition,
                                boolean isLastChild, View convertView, ViewGroup parent) {
                        TextView textView = getGenericView();
                        textView.setText(getChild(groupPosition, childPosition).toString());
                        return textView;
                }

                @Override
                public Object getGroup(int groupPosition) {
                        return groups[groupPosition];
                }

                @Override
                public int getGroupCount() {
                        return groups.length;
                }

                @Override
                public long getGroupId(int groupPosition) {
                        return groupPosition;
                }

                // 取父列表中的某一項的 View
                @Override
                public View getGroupView(int groupPosition, boolean isExpanded,
                                View convertView, ViewGroup parent) {
                        TextView textView = getGenericView();
                        textView.setText(getGroup(groupPosition).toString());
                        return textView;
                }

                @Override
                public boolean hasStableIds() {
                        return true;
                }

                @Override
                public boolean isChildSelectable(int groupPosition, int childPosition) {
                        return true;
                }
                                
                // 獲取某一項的 View 的邏輯
                private TextView getGenericView() {
                        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                                        ViewGroup.LayoutParams.FILL_PARENT, 48);
                        TextView textView = new TextView(_ExpandableList.this);
                        textView.setLayoutParams(lp);
                        textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
                        textView.setPadding(32, 0, 0, 0);
                        return textView;
                }
        }
}

 

 

OK
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