安卓学习-activity-ExpandableListActivity

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>

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>

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>>>();

    protected void 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
            public int getGroupCount() {
                // TODO 自动生成的方法存根
                return data.size();
            }

            @Override
            public int 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
                return null;
            }

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

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

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

            @Override
            public boolean hasStableIds() {
                // TODO 自动生成的方法存根
                return false;
            }

            @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
            public boolean isChildSelectable(int groupPosition,
                    int childPosition) {
                // TODO 自动生成的方法存根
                return true;
            }    

        };
        
        setListAdapter(adapter);
        //添加单击事件
        getExpandableListView().setOnChildClickListener(new OnChildClickListener() {
            
            @Override
            public boolean 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);
                return true;
            }
        });
    }
}