RecyclerView drag

通过ItemtouchHelper.

packagecom.wds.testdragrecyclerview;

importandroid.support.v7.app.AppCompatActivity;

importandroid.os.Bundle;

importandroid.support.v7.widget.GridLayoutManager;

importandroid.support.v7.widget.RecyclerView;

importandroid.support.v7.widget.helper.ItemTouchHelper;

importandroid.util.Log;

importandroid.view.LayoutInflater;

importandroid.view.View;

importandroid.view.ViewGroup;

importandroid.widget.ImageView;

public classMainActivityextendsAppCompatActivity {

privateRecyclerViewmDragView;

@Override

protected voidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mDragView= (RecyclerView) findViewById(R.id.dragview);

mDragView.setLayoutManager(newGridLayoutManager(this,4));

mDragView.setAdapter(newMyAdapter());

ItemTouchHelper helper =newItemTouchHelper(newItemTouchHelper.Callback() {

@Override

public intgetMovementFlags(RecyclerView recyclerView,RecyclerView.ViewHolder viewHolder) {

Log.e("wds","getMovementFlags");

intdragFlag = ItemTouchHelper.LEFT| ItemTouchHelper.DOWN| ItemTouchHelper.UP| ItemTouchHelper.RIGHT;

intswipeFlag = ItemTouchHelper.START| ItemTouchHelper.END;

returnmakeMovementFlags(dragFlag,swipeFlag);

}

@Override

public booleanonMove(RecyclerView recyclerView,RecyclerView.ViewHolder viewHolder,RecyclerView.ViewHolder target) {

Log.e("wds","onMove:"+ viewHolder.getAdapterPosition() +";"+ target.getAdapterPosition());

recyclerView.getAdapter().notifyItemMoved(viewHolder.getAdapterPosition(),target.getAdapterPosition());

return false;

}

@Override

public voidonSwiped(RecyclerView.ViewHolder viewHolder, intdirection) {

Log.e("wds","onSwiped");

}

});

helper.attachToRecyclerView(mDragView);

}

public static classMyAdapterextendsRecyclerView.Adapter {

@Override

publicMyViewHolderonCreateViewHolder(ViewGroup parent, intviewType) {

return newMyViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item, null));

}

@Override

public voidonBindViewHolder(MyViewHolder holder, intposition) {

}

@Override

public intgetItemCount() {

return10;

}

}

public static classMyViewHolderextendsRecyclerView.ViewHolder {

public finalImageViewimageView;

publicMyViewHolder(View itemView) {

super(itemView);

imageView= (ImageView) itemView.findViewById(R.id.imageView);

}

}

}