CODEWITHSUNDEEP
androidandroid-widget
foke
foke

Reputation: 1

rendering a TextView in a Bitmap for an android widget

I'm building a widget which displays some text. By widget I mean the kind which lies on the desktop.

The problem is that I want to change text's font at runtime. There is several textview I would like, at runtime, to set the first as bold, the second blue and italic for example, etc.

I came up with this : 

TextView tv = new TextView(context);
tv.setText(stringToDisplay);
tv.setTextColor(0xa00050ff);  // example
tv.setTextSize(30);           // example

Bitmap b = loadBitmapFromView(tv);
updateViews.setImageViewBitmap(R.id.id_of_the_imageview, b);

with

private static Bitmap loadBitmapFromView(View v)
{
 Bitmap b = Bitmap.createBitmap(v.getLayoutParams().width, v.getLayoutParams().height,      Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
v.layout(0, 0, v.getLayoutParams().width, v.getLayoutParams().height);
v.draw(c);
return b;
}

but it wont work (NullPointerException on first line of loadBitmap), until I replace v.getLayoutParams().width, v.getLayoutParams().height by fixed sizes like 250, 50

Bitmap b = Bitmap.createBitmap(250, 50, Bitmap.Config.ARGB_8888);
// ...
v.layout(0, 0, 250, 50);

But that's not a good solution ...

so I tried this : 

  LayoutInflater li = (LayoutInflater)    context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  View row = li.inflate(R.layout.widget_text, null);

  TextView tv = (TextView) row.findViewById(R.id.id_of_the_textview);

widget_text being a layout similar to the displayed one but with TextViews instead of ImageViews, in the hope to get some size information out of it ..

but it's not working and I get this exception :

01-02 17:35:06.001: ERROR/AndroidRuntime(11025): Caused by: java.lang.IllegalArgumentException: width and height must be > 0

on the call to Bitmap.createBitmap()

so, someone could point me in the right direction?

Upvotes: 0

Views: 1235

Answers (2)

Daren Robbins
Daren Robbins

Reputation: 2025

You can set the size dynamically:

    float mySize = 10f;
    updateViews.setFloat(R.id.textview, "setTextSize", mySize);

Upvotes: 1

mvds
mvds

Reputation: 47034

Through RemoteViews you can still hide and show elements, so why not duplicate the text views for all font styles you might encounter?

something like:

widget.setViewVisibility(R.id.textview_italic,View.GONE);
widget.setViewVisibility(R.id.textview_bold,View.VISIBLE);

using images to display text should always be the last resort.

Upvotes: 1

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