Android ListView列表中的子item随手指水平左右滑动，滑动删除基础

「爱情、让人受尽委屈。」 2022-12-19 06:22 178阅读 0赞

package zhangphil.app;
    
    import android.app.ListActivity;
    import android.content.Context;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    import android.widget.TextView;
    import android.widget.Toast;
    
    import androidx.annotation.NonNull;
    import androidx.annotation.Nullable;
    
    public class MainActivity extends ListActivity {
        private ListView listView;
        private ListViewAdapter adapter;
        private String TAG = "移动";
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            listView = getListView();
            adapter = new ListViewAdapter(this, android.R.layout.simple_list_item_1);
            listView.setAdapter(adapter);
    //        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    //            @Override
    //            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    //                Toast.makeText(getApplicationContext(), position + "", Toast.LENGTH_SHORT).show();
    //            }
    //        });
        }
    
        private class ListViewAdapter extends ArrayAdapter {
            private Context context;
            private int resId;
    
            public ListViewAdapter(@NonNull Context context, int resource) {
                super(context, resource);
                this.context = context;
                this.resId = resource;
            }
    
            @NonNull
            @Override
            public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
                if (convertView == null) {
                    convertView = LayoutInflater.from(context).inflate(resId, null);
                }
    
                TextView textView = convertView.findViewById(android.R.id.text1);
                textView.setText(position + "");
    
                convertView.setOnTouchListener(new View.OnTouchListener() {
                    private int oldX;
                    private int RIGHT_EDGE = listView.getRight();
    
                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                        switch (event.getAction()) {
                            case MotionEvent.ACTION_DOWN:
                                oldX = (int) event.getX();
                                break;
    
                            case MotionEvent.ACTION_MOVE:
                                int dx = (int) event.getX() - oldX;
    
                                int right = v.getRight() + dx;
                                if (right > RIGHT_EDGE) {
                                    Log.d(TAG, "超出右边");
                                    break;
                                }
    
                                v.layout(v.getLeft() + dx, v.getTop(), v.getRight() + dx, v.getBottom());
                                break;
                        }
    
                        return true;
                    }
                });
    
                return convertView;
            }
    
            @Override
            public int getCount() {
                return 20;
            }
        }
    }