android.widget.TextView#setOnDragListener ( )源码实例Demo

@Override
    protected void onShowProbImpl() {
        GridLayout sortArea = findViewById(R.id.sort_area);
        sortArea.removeAllViews();

        sortArea.setOnDragListener(this);

        Set<Integer> nums = new TreeSet<>();
        SortingLevel level = ((SortingLevel) getLevel());

        String numliststr = getSavedLevelValue("numlist", (String) null);
        if (numliststr == null || numliststr.length() == 0) {
            int tries = 0;
            do {
                nums.add(getRand(level.getMaxNum()));
            } while (tries++ < 100 && nums.size() < level.getNumItems());

            numlist = new ArrayList<>(nums);

            do {
                Collections.shuffle(numlist);
            } while (isSorted(numlist));

        } else {
            numlist = splitInts(",", numliststr);
            deleteSavedLevelValue("numlist");
        }

        int mlen = (level.getMaxNum() + "").length();
//        int xsize = getScreenSize().x;
//
//        int tsize = xsize*2/3 / numcolumns / 4 - 5;
//        if (tsize>30) tsize = 30;
        int tsize = 30 - mlen;

        for (int num : numlist) {
            String spaces = "";
            for (int i = 0; i < Math.max(3, mlen) - (num + "").length(); i++) {
                spaces += " ";
            }

            final String numstr = spaces + num;

            TextView item = new TextView(this);
            item.setText(numstr);
            item.setTag(num);
            item.setOnTouchListener(this);
            item.setOnDragListener(this);


            item.setMaxLines(1);
            item.setTextSize(tsize);
            item.setTypeface(Typeface.MONOSPACE);
            //item.setWidth(xsize*2/3 / numcolumns -10);
            //item.setEms(mlen);

            item.setGravity(Gravity.END);

            GridLayout.LayoutParams lp = new GridLayout.LayoutParams();

            lp.setMargins(1, 1, 1, 1);
            lp.setGravity(Gravity.CENTER);
            item.setLayoutParams(lp);
            item.setBackgroundColor(BACKGROUND_COLOR);
            item.setPadding(16, 12, 16, 12);

            sortArea.addView(item);
        }
        problemDone = false;
        moves = 0;

        setFasttimes(level.getNumItems()*300, level.getNumItems()*500, level.getNumItems()*750);

        startHint(level.getNumItems());
    }
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout_activity2);
    setTitle("Second Activity");
    mTextView = (TextView) findViewById(R.id.textview);
    mScrollView = (ScrollView) findViewById(R.id.scrollview);
    mScrollView.post(new Runnable() {
        @Override
        public void run() {
            mScrollView.fullScroll(View.FOCUS_DOWN);
        }
    });
    mDrawTextView = (TextView) findViewById(R.id.drag_textview);
    mDrawImageView = (ImageView) findViewById(R.id.drag_imageview);
    mDrawTextView.setOnDragListener(new View.OnDragListener() {
        @Override
        public boolean onDrag(View view, DragEvent dragEvent) {
            switch (dragEvent.getAction()) {
                case DragEvent.ACTION_DRAG_STARTED:
                    log("ACTION_DRAG_STARTED");
                    break;
                case DragEvent.ACTION_DRAG_ENTERED:
                    log("ACTION_DRAG_ENTERED");
                    break;
                case DragEvent.ACTION_DRAG_EXITED:
                    log("ACTION_DRAG_EXITED");
                    break;
                case DragEvent.ACTION_DRAG_LOCATION:
                    log("ACTION_DRAG_LOCATION");
                    break;
                case DragEvent.ACTION_DRAG_ENDED:
                    log("ACTION_DRAG_ENDED");
                    break;
                case DragEvent.ACTION_DROP:
                    log("ACTION_DROP");
                    mDrawTextView.setVisibility(View.GONE);
                    mDrawImageView.setVisibility(View.VISIBLE);
                    ClipData clipData = dragEvent.getClipData();
                    mDrawImageView.setImageURI(clipData.getItemAt(1).getUri());
                    Toast.makeText(mActivity, clipData.getItemAt(0).getText(), Toast.LENGTH_LONG).show();
                    break;
                default:
                    break;
            }
            return true;
        }
    });
    print("onCreate", "#ff0000", false);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.drag_layout);

    TextView text = (TextView) findViewById(R.id.drag_text);
    DraggableDot dot = (DraggableDot) findViewById(R.id.drag_dot_1);
    dot.setReportView(text);
    dot = (DraggableDot) findViewById(R.id.drag_dot_2);
    dot.setReportView(text);
    dot = (DraggableDot) findViewById(R.id.drag_dot_3);
    dot.setReportView(text);

    mHiddenDot = (DraggableDot) findViewById(R.id.drag_dot_hidden);
    mHiddenDot.setReportView(text);

    mResultText = (TextView) findViewById(R.id.drag_result_text);
    mResultText.setOnDragListener(new View.OnDragListener() {
        public boolean onDrag(View v, DragEvent event) {
            final int action = event.getAction();
            switch (action) {
                case DragEvent.ACTION_DRAG_STARTED: {
                    // Bring up a fourth draggable dot on the fly. Note that it
                    // is properly notified about the ongoing drag, and lights up
                    // to indicate that it can handle the current content.
                    mHiddenDot.setVisibility(View.VISIBLE);
                } break;

                case DragEvent.ACTION_DRAG_ENDED: {
                    // Hide the surprise again
                    mHiddenDot.setVisibility(View.INVISIBLE);

                    // Report the drop/no-drop result to the user
                    final boolean dropped = event.getResult();
                    mResultText.setText(dropped ? "Dropped!" : "No drop");
                } break;
            }
            return false;
        }
    });
}