CheckBox hashmap返回Null

Question

这是我的代码，按下按钮时会调用Spawn方法：

     public void Spawn (View V) {
       LayoutInflater inflater =
       (LayoutInflater)this.getSystemService( Context.LAYOUT_INFLATER_SERVICE );
       View iv = inflater.inflate( R.layout.motor_block, null );
       //LinearLayout iv = (LinearLayout) findViewById(R.id.motor_block);
       RelativeLayout rl = (RelativeLayout) findViewById(R.id.layout);
       CheckBox A = (CheckBox)findViewById(R.id.checkBox1);
       boxesA.put(currentKey,A);
       CheckBox B = (CheckBox)findViewById(R.id.checkBox2);
       boxesB.put(currentKey,B);
       CheckBox C = (CheckBox)findViewById(R.id.checkBox3);
       boxesC.put(currentKey,C);
       iv.setTag(currentKey);
       rl.addView(iv);
       currentKey ++; 
            iv.setOnTouchListener(new View.OnTouchListener() {
                public boolean  onTouch(View v,MotionEvent event) {
                        iAction = event.getActionMasked();
                    switch (iAction) {
                    case MotionEvent.ACTION_MOVE:
                        v.getLocationOnScreen(aLocation);                   // get absolute physical location of this View
                        iOffsetX =  (aLocation [ 0 ] - (int) v.getX());     // subtract out this View's relative location within its parent View...
                        iOffsetY =  (aLocation [ 1 ] - (int) v.getY());     // ...yielding the offsets that convert getRawX/Y's coords to setX/Y's coords

                        iNewX = (int) event.getRawX();                      // get absolute physical coords of this touch
                        iNewY = (int) event.getRawY();
                        iNewX -= iOffsetX;                                  // remove parent View's screen offset (calc'd above)
                        iNewY -= iOffsetY;
                        iNewX -= iRelX;                                     // remove stored touch offset
                        iNewY -= iRelY;
                        v.setX(iNewX);                                      // finally, move View to new coords (relative to its parent View)
                        v.setY(iNewY);
                        bExitValue = true;          
                    break;

                    case MotionEvent.ACTION_DOWN:
                        if (delete){ v.setVisibility(View.GONE); }
                        iRelX = (int) event.getX();                         // preserve offset of this touch within the View
                        iRelY = (int) event.getY();
                        bExitValue = false;
                    break;

                    case MotionEvent.ACTION_UP:
                        bExitValue = true;
                    break;

                    }
                    return (bExitValue);


                }
            });

               iv.setOnLongClickListener(new OnLongClickListener() {

                    @Override
                    public boolean onLongClick(View v) {
                        v.setHapticFeedbackEnabled(false);
                        if (!bExitValue) {
                            Log.i("TAG",(String) v.getTag());

                            int key = (Integer) v.getTag();
                            CheckBox A = boxesA.get(key);
                            CheckBox B = boxesB.get(key);
                            CheckBox C = boxesC.get(key);
                        if (A.isChecked()){   //A IS NULL
                            Log.i("Checked","A");
                        }
                        if (B.isChecked()){
                            Log.i("Checked","B");
                        }
                        if (C.isChecked()){
                            Log.i("Checked","C");
                        }

                        Log.i("Click","LONG");
                        v.setHapticFeedbackEnabled(true);
                        }
                        return true;
                    }
                });

   }

在此方法中，会生成一个视图，其中包含三个复选框。 我只是把它们放在一个Hash-map中，以Integer为键。 事实证明A是空的，这对我来说毫无意义。有什么想法吗？

提前致谢。

Answer 1

在尝试访问属于它的CheckBox视图之前，您需要将视图添加到布局中。在呈现之前访问这些视图的任何尝试都将返回null，因为它们尚未创建。