在 ListView 中使用子项 Android

Question

我做资产管理系统信息化项目，数据保存在SQLite database。我想在listview中显示信息和时间，但它只是显示信息。我希望两者都出现在 listview 中。有什么想法吗？

信息的字符串是daftar，时间是timer。


<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_marginBottom="5dp"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:layout_marginTop="5dp"
    android:orientation="vertical" > 


        <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp" >
        </ListView>   

</LinearLayout>

这是我的 database.java



public class Database extends Activity {
 String[] daftar,timer; 
 ListView ListView01;
 Menu menu;
 protected Cursor cursor,cursor2;
 DataCenter dbcenter;
 public static Database ma;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.database);


  ma = this;
        dbcenter = new DataCenter(this);
        RefreshList();
 }

 public void RefreshList(){
     SQLiteDatabase db = dbcenter.getReadableDatabase();
     cursor = db.rawQuery("SELECT * FROM data",null);
     cursor2 = db.rawQuery("SELECT * FROM data",null);

     timer = new String[cursor2.getCount()];
     daftar = new String[cursor.getCount()];

     cursor.moveToFirst();
     for (int cc=0; cc < cursor.getCount(); cc++){
      cursor.moveToPosition(cc);
      daftar[cc] = cursor.getString(1).toString();
     }

     cursor2.moveToNext();
     for (int bb=0; bb < cursor2.getCount(); bb++){
      cursor2.moveToPosition(bb);
      timer[bb] = cursor2.getString(3).toString();
     }



     ListView01 = (ListView)findViewById(R.id.listView1);
     ListView01.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, daftar));
     ListView01.setSelected(true);
     ListView01.setOnItemClickListener(new OnItemClickListener() {


      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
       final String selection = daftar[arg2]; //.getItemAtPosition(arg2).toString();
       final CharSequence[] dialogitem = {"View", "Edit", "Delete"};
       AlertDialog.Builder builder = new AlertDialog.Builder(Database.this);
       builder.setTitle("Pilih Menu");
       builder.setItems(dialogitem, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int item) {
         switch(item){
         case 0 :
          Intent i = new Intent(getApplicationContext(), DetailDatabase.class);
          i.putExtra("informasi", selection);
          startActivity(i);
          break;
         case 1 :
          Intent in = new Intent(getApplicationContext(), UbahDatabase.class);
          in.putExtra("informasi", selection);
          startActivity(in);
          break;
         case 2 :
          SQLiteDatabase db = dbcenter.getWritableDatabase();
          db.execSQL("delete from data where informasi = '"+selection+"'");
          RefreshList();
          break;
         }
        }
       });
       builder.create().show();
      }});
      ((ArrayAdapter)ListView01.getAdapter()).notifyDataSetInvalidated();
     }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

}

Answer 1

我对您的 RefreshList 函数进行了更改。只是删除了您的 SQLite 数据并替换为本地数据）。检查图像以供参考

 public void RefreshList(){
        timer = new String[6];
        daftar = new String[6];
        for (int cc=0; cc < daftar.length; cc++)
            daftar[cc] = "daftar " + cc;
        for (int bb=0; bb < timer.length; bb++)
            timer[bb] = "timer "+bb;

    ListView01 = findViewById(R.id.listView1);
    ArrayList<HashMap<String, Object>> listArg = new ArrayList<>();
    HashMap<String, Object> map;
    for(int i=0; i<timer.length; i++){
        map = new HashMap<>();
        map.put("timer", timer[i]);
        map.put("daftar", daftar[i]);
        listArg.add(map);
    }

    SimpleAdapter adapter = new SimpleAdapter(this, listArg, R.layout.row, new String[]{"timer", "daftar"}, new int[]{R.id.tvTimer, R.id.tvDaftar});
    ListView01.setAdapter(adapter);
    ListView01.setSelected(true);
}

您需要使用简单的或自定义的适配器，因为您当前的适配器 ArrayAdapter 一次只能处理一个字符串。

有关教程，请查看此链接 Link 1 or Link 2

Answer 2

我终于得到答案了，谢谢你的帮助。我知道代码仍然一团糟，但它可以工作。感谢所有帮助过我的人。我使基于 SQLite 数据库的 CRUD 项目和列表视图显示数据库中的子项。您可以下载该项目 HERE


public void RefreshList(){
        SQLiteDatabase db = dbcenter.getReadableDatabase();

        cursor = db.rawQuery("SELECT * FROM biodata",null);

        daftar = new String[cursor.getCount()];
        timer = new String[cursor.getCount()];

        ArrayList<Map<String,Object>> itemDataList = new ArrayList<Map<String,Object>>();;

        cursor.moveToFirst();

        for (int cc=0; cc < cursor.getCount(); cc++){
            cursor.moveToPosition(cc);
            daftar[cc] = cursor.getString(1).toString();
            timer[cc] = cursor.getString(3).toString();

            String[] daftarr = daftar;
            String[] timerr = timer;

            Map<String,Object> listItemMap = new HashMap<String,Object>();
            listItemMap.put("title", daftarr[cc]);
            listItemMap.put("description", timerr[cc]);
            itemDataList.add(listItemMap);


        ListView01 = (ListView)findViewById(R.id.listView1);

        SimpleAdapter simpleAdapter = new SimpleAdapter(this,itemDataList,android.R.layout.simple_list_item_2,
                new String[]{"title","description"},new int[]{android.R.id.text1,android.R.id.text2});

        ListView01.setAdapter(simpleAdapter);


         ListView01.setOnItemClickListener(new OnItemClickListener() {


              public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
               final String selection = daftar[arg2]; //.getItemAtPosition(arg2).toString();
               final CharSequence[] dialogitem = {"View", "Edit", "Delete"};
               AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
               builder.setTitle("Pilih Menu");
               builder.setItems(dialogitem, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int item) {
                 switch(item){
                 case 0 :
                  Intent i = new Intent(getApplicationContext(), LihatActivity.class);
                  i.putExtra("nama", selection);
                  startActivity(i);
                  break;
                 case 1 :
                  Intent in = new Intent(getApplicationContext(), UbahActivity.class);
                  in.putExtra("nama", selection);
                  startActivity(in);
                  break;
                 case 2 :
                  SQLiteDatabase db = dbcenter.getWritableDatabase();
                  db.execSQL("delete from biodata where nama = '"+selection+"'");
                  RefreshList();
                  break;
                 }
                }
               });
               builder.create().show();
              }});
              ((SimpleAdapter)ListView01.getAdapter()).notifyDataSetInvalidated();
        }
             }

感谢所有帮助过我的人。

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