Android Resources converting to string TypedValue warning

I've discovered that this warning is also outputted when specifying a plurals string from a widget that requires parameters.

For instance:

<plurals name="song_count">
    <item quantity="one">%d song in playlist</item>
    <item quantity="other">%d songs in playlist</item>
</plurals>

The warning will appear when inflating an activity that contains a widget referencing it:

<TextView
    android:id="@+id/tv_total_songs"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@plurals/song_count" />

You no doubt replace the string after inflating the views to set the correct parameters, e.g.:

playlistSongCount.setText(
        getResources().getQuantityString(
            R.plurals.song_count,
            songCount,
            songCount));

The obvious solution here is to remove the android:text attribute from the layout as it has no purpose.

You are using a bool resource where a string is expected.

You can find which resource is being used incorrectly by opening your generated R.java file and searching for the resource IDs from the logcat message:

0x7f08002b
0x7f08002c
0x7f08002d

All three should be from your bool.xml file (the "t=0x12" in the warning message means the resources are TYPE_INT_BOOLEAN).

Then, find where those resource IDs are being used in your project (probably a layout xml, but could be anywhere) and make sure the types match.

Here's an example of a TextView that would generate that log message. If in my res/values/bool.xml I have:

<resources>
    <bool name="foo_flag">false</bool>
</resources>

I can incorrectly refer to it from a a layout xml file:

<TextView android:id="@+id/foo"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="@bool/foo_flag"></TextView>

When I run that app, I'll get the warning message since "text" expects a string resource, not a bool (my app appears as expected though since the flag is converted to the string "false").

Updated for Android Gradle 4.X:

As of sometime by version 4.0.1 of the Android grade plugin this has changed. An R.java file is no longer generated. Instead An R.txt file is generated located somewhere like:

    build/intermediates/runtime_symbol_list/{variant}/R.txt

These warnings only occurred when a certain developer option was enabled.

Device Settings > Developer options > Disable 'Enable view attribute inspection'