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安卓学习-activity-ExpandableListActivity

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了安卓学习-activity-ExpandableListActivity，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含6476字，纯文字阅读大概需要10分钟。

内容图文

ExpandableListActivity

将所有应用程序按a-z分组，展开并点击启动程序

 

group.xml

                <
                RelativeLayout 
                xmlns:android
                ="http://schemas.android.com/apk/res/android"
                
    android:layout_width
                ="fill_parent"
                
    android:layout_height
                ="fill_parent"
                 android:padding
                ="5dp"
                >
                <
                TextView
        
                android:id
                ="@+id/textView1"
                
        android:layout_width
                ="wrap_content"
                
        android:layout_height
                ="wrap_content"
                
        android:layout_alignParentLeft
                ="true"
                
        android:layout_alignParentTop
                ="true"
                
        android:text
                ="组"
                
        android:textAppearance
                ="?android:attr/textAppearanceLarge"
                />
                <
                TextView
        
                android:id
                ="@+id/textView2"
                
        android:layout_width
                ="wrap_content"
                
        android:layout_height
                ="wrap_content"
                
        android:layout_alignParentTop
                ="true"
                
        android:layout_marginLeft
                ="16dp"
                
        android:layout_toRightOf
                ="@+id/textView1"
                
        android:text
                ="A"
                
        android:textAppearance
                ="?android:attr/textAppearanceLarge"
                />
                <
                TextView
        
                android:id
                ="@+id/textView3"
                
        android:layout_width
                ="wrap_content"
                
        android:layout_height
                ="wrap_content"
                
        android:layout_alignParentTop
                ="true"
                
        android:layout_marginLeft
                ="17dp"
                
        android:layout_toRightOf
                ="@+id/textView2"
                
        android:text
                ="共"
                
        android:textAppearance
                ="?android:attr/textAppearanceLarge"
                />
                <
                TextView
        
                android:id
                ="@+id/textView4"
                
        android:layout_width
                ="wrap_content"
                
        android:layout_height
                ="wrap_content"
                
        android:layout_alignParentTop
                ="true"
                
        android:layout_toRightOf
                ="@+id/textView3"
                
        android:text
                ="0"
                
        android:textAppearance
                ="?android:attr/textAppearanceLarge"
                />
                <
                TextView
        
                android:id
                ="@+id/textView5"
                
        android:layout_width
                ="wrap_content"
                
        android:layout_height
                ="wrap_content"
                
        android:layout_alignParentTop
                ="true"
                
        android:layout_toRightOf
                ="@+id/textView4"
                
        android:text
                ="项"
                
        android:textAppearance
                ="?android:attr/textAppearanceLarge"
                />
                </
                RelativeLayout
                >
View Code

item.xml

                <
                RelativeLayout 
                xmlns:android
                ="http://schemas.android.com/apk/res/android"
                
    android:layout_width
                ="fill_parent"
                
    android:layout_height
                ="fill_parent"
                
    android:paddingTop
                ="20dp"
                
    android:paddingBottom
                ="20dp"
                >
                <
                ImageView
        
                android:id
                ="@+id/imageView1"
                
        android:layout_width
                ="wrap_content"
                
        android:layout_height
                ="wrap_content"
                
        android:layout_alignParentLeft
                ="true"
                
        android:layout_alignParentTop
                ="true"
                
        android:paddingRight
                ="20dp"
                
        android:src
                ="@drawable/ic_launcher"
                />
                <
                TextView
        
                android:id
                ="@+id/textView1"
                
        android:layout_width
                ="wrap_content"
                
        android:layout_height
                ="wrap_content"
                
        android:layout_alignParentTop
                ="true"
                
        android:layout_toRightOf
                ="@+id/imageView1"
                
        android:text
                ="Large Text"
                
        android:textAppearance
                ="?android:attr/textAppearanceLarge"
                />
                <
                TextView
        
                android:id
                ="@+id/textView2"
                
        android:layout_width
                ="wrap_content"
                
        android:layout_height
                ="wrap_content"
                
        android:layout_alignLeft
                ="@+id/textView1"
                
        android:layout_below
                ="@+id/textView1"
                
        android:text
                ="Small Text"
                
        android:textAppearance
                ="?android:attr/textAppearanceSmall"
                />
                </
                RelativeLayout
                >
View Code

MainActivity.java

                public
                class MainActivity extends ExpandableListActivity {

    private List<String> data=new ArrayList<String>();
    private List<List<Map<String,Object>>> data_c=new ArrayList<List<Map<String,Object>>>();

    protectedvoid onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设置26个字母for(int k=97;k<97+26;k++){
            String zm=(char)k+"";
            data.add(zm);
            
            //获取应用程序按26个字母分组
            List<PackageInfo> pags = getPackageManager().getInstalledPackages(0);
            List<Map<String, Object>> data1 = new ArrayList<Map<String, Object>>();

            for (int i = 0; i < pags.size(); i++) {
                PackageInfo pag = pags.get(i);
                if(pag.packageName.substring(pag.packageName.lastIndexOf(".")+1).substring(0,1).equals(zm)){
                        Map<String, Object> map = new HashMap<String, Object>();
                        // 程序名字
                        map.put("name",pag.applicationInfo.loadLabel(getPackageManager()).toString());
                        // 图标
                        map.put("drawable",pag.applicationInfo.loadIcon(getPackageManager()));
                        map.put("packageName", pag.packageName);
                        data1.add(map);
                }
            }
            data_c.add(data1);
        }


        BaseExpandableListAdapter adapter=new BaseExpandableListAdapter(){

            @Override
            publicint getGroupCount() {
                // TODO 自动生成的方法存根return data.size();
            }

            @Override
            publicint getChildrenCount(int groupPosition) {
                // TODO 自动生成的方法存根return data_c.get(groupPosition).size();
            }

            @Override
            public Object getGroup(int groupPosition) {
                // TODO 自动生成的方法存根returnnull;
            }

            @Override
            public Object getChild(int groupPosition, int childPosition) {
                // TODO 自动生成的方法存根returnnull;
            }

            @Override
            publiclong getGroupId(int groupPosition) {
                // TODO 自动生成的方法存根return 0;
            }

            @Override
            publiclong getChildId(int groupPosition, int childPosition) {
                // TODO 自动生成的方法存根return 0;
            }

            @Override
            publicboolean hasStableIds() {
                // TODO 自动生成的方法存根returnfalse;
            }

            @Override
            public View getGroupView(int groupPosition, boolean isExpanded,
                    View convertView, ViewGroup parent) {
                if(convertView==null){
                    convertView=LayoutInflater.from(MainActivity.this).inflate(R.layout.group, null);
                }
                TextView tv1=(TextView)convertView.findViewById(R.id.textView2);
                TextView tv3=(TextView)convertView.findViewById(R.id.textView4);
                tv1.setText(data.get(groupPosition));
                tv3.setText(data_c.get(groupPosition).size()+"");
        
                return convertView;
            }

            @Override
            public View getChildView(int groupPosition, int childPosition,
                    boolean isLastChild, View convertView, ViewGroup parent) {
                if(convertView==null){
                    convertView=LayoutInflater.from(MainActivity.this).inflate(R.layout.item, null);
                }
                ImageView iv1=(ImageView)convertView.findViewById(R.id.imageView1);
                TextView tv2=(TextView)convertView.findViewById(R.id.textView1);
                TextView tv4=(TextView)convertView.findViewById(R.id.textView2);
                tv2.setText(data_c.get(groupPosition).get(childPosition).get("name")+"");
                tv4.setText(data_c.get(groupPosition).get(childPosition).get("packageName")+"");
                iv1.setImageDrawable((Drawable)data_c.get(groupPosition).get(childPosition).get("drawable"));
         
                return convertView;
            }

            @Override
            publicboolean isChildSelectable(int groupPosition,
                    int childPosition) {
                // TODO 自动生成的方法存根returntrue;
            }    

        };
        
        setListAdapter(adapter);
        //添加单击事件
        getExpandableListView().setOnChildClickListener(new OnChildClickListener() {
            
            @Override
            publicboolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                
                 Intent intent = MainActivity.this.getPackageManager().getLaunchIntentForPackage(
                            data_c.get(groupPosition).get(childPosition).get("packageName")+"");
                 startActivity(intent);
                returntrue;
            }
        });
    }
}
View Code

 

原文：http://www.cnblogs.com/weijj/p/4137917.html

内容总结

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