Android 在安卓系统中,如何在“让”或“右”刷卡后重新刷卡到初始状态?
下面是我的代码。我能左右滑动。但问题是,一旦我向左或向右滑动,我就不能再向右或向左滑动,回到初始状态。例如,首先我将有文本视图列表,然后如果我向左滑动,那么我将得到一个图标,文本视图将消失。因此,现在我需要向右滑动以返回文本视图,并且时间图标应该消失。我该怎么做Android 在安卓系统中,如何在“让”或“右”刷卡后重新刷卡到初始状态?,android,Android,下面是我的代码。我能左右滑动。但问题是,一旦我向左或向右滑动,我就不能再向右或向左滑动,回到初始状态。例如,首先我将有文本视图列表,然后如果我向左滑动,那么我将得到一个图标,文本视图将消失。因此,现在我需要向右滑动以返回文本视图,并且时间图标应该消失。我该怎么做 public class MainActivity extends AppCompatActivity { private ArrayList countries = new ArrayList<>(
public class MainActivity extends AppCompatActivity {
private ArrayList countries = new ArrayList<>();
private DataAdapter adapter;
private RecyclerView recyclerView;
private AlertDialog.Builder alertDialog;
private EditText et_country;
private int edit_position;
private View view;
private boolean add = false;
private Paint p = new Paint();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
}
private void initViews(){
recyclerView = (RecyclerView)findViewById(R.id.card_recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
adapter = new DataAdapter(countries);
recyclerView.setAdapter(adapter);
initSwipe();
}
private void initSwipe(){
final ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT ) {
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return true;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getAdapterPosition();
if( direction == ItemTouchHelper.RIGHT) {
Toast.makeText(MainActivity.this, "right", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "left", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
Bitmap icon;
if(actionState == ItemTouchHelper.ACTION_STATE_SWIPE){
View itemView = viewHolder.itemView;
float height = (float) itemView.getBottom() - (float) itemView.getTop();
float width = height / 3;
if(dX < 0) {
p.setColor(Color.parseColor("#FF0000"));
RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom());
c.drawRect(background,p);
icon = BitmapFactory.decodeResource(getResources(), R.drawable.selectedicon);
RectF icon_dest = new RectF((float) itemView.getRight() - 2*width ,(float) itemView.getTop() + width,(float) itemView.getRight() - width,(float)itemView.getBottom() - width);
c.drawBitmap(icon,null,icon_dest,p);
} else {
p.setColor(Color.parseColor("#D32F2F"));
RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom());
c.drawRect(background,p);
icon = BitmapFactory.decodeResource(getResources(), R.drawable.selectedicon);
RectF icon_dest = new RectF((float) itemView.getRight() - 2*width ,(float) itemView.getTop() + width,(float) itemView.getRight() - width,(float)itemView.getBottom() - width);
c.drawBitmap(icon,null,icon_dest,p);
}
}
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
};
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);
}
}
public类MainActivity扩展了AppCompatActivity{
私有ArrayList国家/地区=新ArrayList();
专用数据适配器;
私人回收站;
私有AlertDialog.Builder AlertDialog;
国家私人编辑部;
私人编辑职位;
私人视野;
私有布尔加法=false;
专用油漆p=新油漆();
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
}
私有void initViews(){
recyclerView=(recyclerView)findViewById(R.id.card\u recycler\u视图);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager LayoutManager=新的LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
适配器=新数据适配器(国家/地区);
recyclerView.setAdapter(适配器);
initSwipe();
}
私有void initSwipe(){
final ItemTouchHelper.SimpleCallback simpleItemTouchCallback=新建ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT){
@凌驾
公共布尔onMove(RecyclerView RecyclerView、RecyclerView.ViewHolder ViewHolder、RecyclerView.ViewHolder目标){
返回true;
}
@凌驾
公共空间(RecyclerView.ViewHolder ViewHolder,int方向){
int position=viewHolder.getAdapterPosition();
if(direction==ItemTouchHelper.RIGHT){
Toast.makeText(MainActivity.this,“right”,Toast.LENGTH_SHORT.show();
}否则{
Toast.makeText(MainActivity.this,“left”,Toast.LENGTH_SHORT.show();
}
}
@凌驾
public void onChildraw(画布c、RecyclerView RecyclerView、RecyclerView.ViewHolder ViewHolder、float dX、float dY、int actionState、boolean isCurrentlyActive){
位图图标;
如果(actionState==ItemTouchHelper.ACTION\u STATE\u SWIPE){
View itemView=viewHolder.itemView;
浮动高度=(float)itemView.getBottom()-(float)itemView.getTop();
浮动宽度=高度/3;
if(dX<0){
p、 setColor(Color.parseColor(#FF0000”);
RectF background=new RectF((float)itemView.getRight()+dX,(float)itemView.getTop(),(float)itemView.getRight(),(float)itemView.getBottom());
c、 drawRect(背景,p);
icon=BitmapFactory.decodeResource(getResources(),R.drawable.selectedicon);
RectF icon_dest=new RectF((float)itemView.getRight()-2*width,(float)itemView.getTop()+width,(float)itemView.getRight()-width,(float)itemView.getBottom()-width);
c、 drawBitmap(图标,null,图标,p);
}否则{
p、 setColor(Color.parseColor(#D32F2F”);
RectF background=new RectF((float)itemView.getRight()+dX,(float)itemView.getTop(),(float)itemView.getRight(),(float)itemView.getBottom());
c、 drawRect(背景,p);
icon=BitmapFactory.decodeResource(getResources(),R.drawable.selectedicon);
RectF icon_dest=new RectF((float)itemView.getRight()-2*width,(float)itemView.getTop()+width,(float)itemView.getRight()-width,(float)itemView.getBottom()-width);
c、 drawBitmap(图标,null,图标,p);
}
}
super.onchildraw(c、recyclerView、viewHolder、dX、dY、actionState、isCurrentlyActive);
}
};
ItemTouchHelper ItemTouchHelper=新的ItemTouchHelper(simpleItemTouchCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);
}
}
if(dX<0){
p、 setColor(Color.parseColor(#FF0000”);
RectF background=new RectF((float)itemView.getRight()+dX,(float)itemView.getTop(),(float)itemView.getRight(),(float)itemView.getBottom());
c、 drawRect(背景,p);
icon=BitmapFactory.decodeResource(getResources(),R.drawable.selectedicon);
RectF icon_dest=new RectF((float)itemView.getRight()-2*width,(float)itemView.getTop()+width,(float)itemView.getRight()-width,(float)itemView.getBottom()-width);
c、 drawBitmap(图标,null,图标,p);
dX=0;
}
上述代码适用于向左滑动,然后向右滑动以返回初始状态。if(dX<0){
p、 setColor(Color.parseColor(#FF0000”);
RectF background=new RectF((float)itemView.getRight()+dX,(float)itemView.getTop(),(float)itemView.getRight(),(float)itemView.getBottom());
c、 drawRect(背景,p);
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return true;
}
change it to return false
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
if(dX < 0) {
p.setColor(Color.parseColor("#FF0000"));
RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom());
c.drawRect(background,p);
icon = BitmapFactory.decodeResource(getResources(), R.drawable.selectedicon);
RectF icon_dest = new RectF((float) itemView.getRight() - 2*width ,(float) itemView.getTop() + width,(float) itemView.getRight() - width,(float)itemView.getBottom() - width);
c.drawBitmap(icon,null,icon_dest,p);
dX = 0;
}