我怎样才能在Android平台的动态切换按钮的文字？ [英] How can I get working dynamic ToggleButton text under android?

问题描述

我已经得到了的成立就像一个切换按钮：

I've got a ToggleButton that's set up like:

final ToggleButton filterButton = (ToggleButton) findViewById(R.id.filterTags);
        filterButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (filterButton.isChecked()) {
                    // pop up the list of tags so the user can choose which to filter by
                    // once one is chosen, the spinner will be updated appropriately
                    showDialog(DIALOG_TAGS);
                } else {
                    // going unpressed, set the the spinner list to everything
                    updateSpinner(db.itemNames());
                }
            }
        });

和对话框如下：

   case DIALOG_TAGS:
        final String[] tagNames = db.tagNamesInUse();
        dialog = new AlertDialog.Builder(this)
            .setItems(tagNames, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        updateSpinner(db.getItemNamesForTag(tagNames[which]));
                        final ToggleButton filterButton = (ToggleButton) findViewById(R.id.filterTags);
                        filterButton.setTextOn(tagNames[which]);
                        dialog.dismiss();
                    }
                })
                .setNegativeButton("Cancel", UITools.getDialogCancellingListener())
            .create();

的理念是：如果切换按钮被接通时，它会弹出单选择列表视图对话框这标记清单。一旦标签被选中，成为了切换按钮新的纹元。如果切换按钮被关闭（未选中），然后将文本恢复到静态TextOff。

The idea is: if the ToggleButton is turned on, it pops up a single-choice listview dialog that's the list of tags. Once a tag is chosen, it becomes the new textOn for the ToggleButton. If the ToggleButton is turned off (unChecked), then the text reverts to the static TextOff.

问题是：一旦该对话框消失的按钮是不是被重新绘制。文字显示还是纹元的previous值。

The problem is: the button isn't being redrawn once the dialog goes away. The text showing is still the previous value of textOn.

我怎么能强制重绘？我试图 filterButton.postInvalidate（）; 但这并没有帮助

How can I force a redraw? I tried filterButton.postInvalidate(); but that didn't help.

推荐答案

解决了！源头上切换按钮的明智读数显示，虽然setTextOn（）和setTextOff（）不会导致（私）syncTextState该更新的TextView位的呼叫，呼叫setChecked（）的确实的。因此，关键是：

Solved! Judicious reading of the source to ToggleButton shows that while setTextOn() and setTextOff() don't cause a call to (private) syncTextState which updates the TextView bits, calling setChecked() does. So the trick is:

dialog = new AlertDialog.Builder(this)
            .setItems(tagNames, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        updateSpinner(db.getItemNamesForTag(tagNames[which]));
                        final ToggleButton filterButton = (ToggleButton) findViewById(R.id.filterTags);
                        filterButton.setTextOn(tagNames[which]);
                        filterButton.setChecked(filterButton.isChecked());
                        dialog.dismiss();
                    }
                })

这工作得相当好。耶开源！

Which worked quite nicely. Yay for open source!

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