How to set Dynamic position of Toast to a View?

问题

First of all this is not complete code

@Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
    {
        Toast toast=Toast.makeText(getApplicationContext(), "", Toast.LENGTH_SHORT);
        toast.setGravity(Gravity.CENTER_HORIZONTAL, 0, 0); 
        View view=toast.getView();
        switch(buttonView.getId())
        {
            case R.id.chkRed: if(chkRed.isChecked())
            {   
                              chkGreen.setChecked(false);
                              chkBlue.setChecked(false);
                              chkYellow.setChecked(false);
                              toast.setText("You Selected Red");
                                toast.setGravity(Gravity.NO_GRAVITY,buttonView.getRight(), chkRed.getTop());
                             //top does not align
                             //it align perfectly to right of checkbox
                              view.setBackgroundColor(Color.RED);
            }
                             break;
}
}

So now the problem is that I want to display toast beside checkbox, I tried working with setGravity(), but it just does not workup and have been hit and trying for long time, but with no progress

How to display toast beside the checkbox?

回答1:

ok, i finally figured out how to get toast beside checkbox or another view

1. You need to get location on screen of the view, by

buttonView.getLocationOnScreen(location);

for more Reference, see getLocationOnScreen(int[])

2. Set gravity to toast using

toast.setGravity(Gravity.TOP|Gravity.LEFT,buttonView.getRight()+5, 
location[1]-10);

the important thing here is set x-coordinate of toast to right of view, e.g., buttonView.getRight() and get y-coordinate from the location[1] ,which you get from getLocationOnScreen()

public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
    {
        Toast toast=Toast.makeText(getApplicationContext(), "", Toast.LENGTH_SHORT);
        toast.setGravity(Gravity.TOP|Gravity.LEFT, 0, 0); 
        View view=toast.getView();
        int location[]=new int[2];
        buttonView.getLocationOnScreen(location);
        switch(buttonView.getId())
        {
            case R.id.chkRed: if(chkRed.isChecked())
            {   
                              chkGreen.setChecked(false);
                              chkBlue.setChecked(false);
                              chkYellow.setChecked(false);
                              toast.setText("You Selected Red");
                              toast.setGravity(Gravity.TOP|Gravity.LEFT,buttonView.getRight()+5, location[1]-10);
                              view.setPadding(1, 1, 1, 1);
                              view.setBackgroundColor(Color.RED);
            }

        }
    }

来源：https://stackoverflow.com/questions/14460269/how-to-set-dynamic-position-of-toast-to-a-view

标签

android

events

checkbox

toast