android - 在 Android 中使用复选框从 ListView 中删除多个项目

Question

您好，我无法使用复选框从 ListView 中删除多个项目。我可以从 ListView 中选择多个项目，但只有第一个被选中的项目被删除，而其他项目没有被删除。这是我的代码。提前致谢!

public class MainActivity extends Activity 
{
    ListView lv;
    ArrayAdapter<String> adapter;
    Button delete;
    ArrayList<String> data = new ArrayList<String>();
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView)findViewById(R.id.listView1);
        delete = (Button)findViewById(R.id.button1);
        data.add("Windows");
        data.add("Android");
        data.add("Apple");
        data.add("Blackberry");
        adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_multiple_choice, data);
        lv.setAdapter(adapter);

        delete.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                deleteCheckedItems();
                adapter.notifyDataSetChanged();
            }
        });


    }

    @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;
    }
    private void deleteCheckedItems() {
        int count = adapter.getCount();

        for (int i = 0; i < count; i++) 
        {
            if (lv.isItemChecked(i))
            {
               data.remove(i);
            }
        }
    }

}

Answer 1

使用 SparseBooleanArray 获取选中的项目，然后删除相同的项目并刷新 ListView 。

public class MainActivity extends Activity 
{
    ListView lv;
    ArrayAdapter<String> adapter;
    Button delete;
    ArrayList<String> data = new ArrayList<String>();
    SparseBooleanArray mCheckStates ;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test);
        lv = (ListView)findViewById(R.id.listView1);
        lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        delete = (Button)findViewById(R.id.button1);
        data.add("Windows");
        data.add("Android");
        data.add("Apple");
        data.add("Blackberry");
        adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_multiple_choice, data);
        lv.setAdapter(adapter);

        delete.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {

                SparseBooleanArray checked = lv.getCheckedItemPositions();
                for (int i = 0; i < lv.getCount(); i++){

                    if (checked.get(i)==true)
                    {
                         data.remove(i);

                    } 
                    adapter.notifyDataSetChanged(); 

                }
                 lv.clearChoices();               
            }
        });


    }
}

编辑:

试试下面的

 delete.setOnClickListener(new OnClickListener()
    {
        @Override
        public void onClick(View v)
        {

             SparseBooleanArray checkedItemPositions = lv.getCheckedItemPositions();
             int itemCount = lv.getCount();

             for(int i=itemCount-1; i >= 0; i--){
                 if(checkedItemPositions.get(i)){
                     adapter.remove(data.get(i));
                 }
             }
             checkedItemPositions.clear();
             adapter.notifyDataSetChanged();

        }
    });