IssueTracker

text.Layout.getLineTop() returns wrong Y coordinates on the second line, probably because of the first line has wrong height. Something to do with wrong scale by 0.2?

Code to reproduce:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Line 0\nLine 1\nLine 2\nLine 3\nLine 4"
        android:textSize="10sp" />
    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_alignParentBottom="true"
        android:onClick="onBtnClick"
        android:text="Button" />
</RelativeLayout>

public class MainActivity extends Activity {
        Layout layout;
        TextView tv;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);
                tv = (TextView) findViewById(R.id.textView1);
        }
        public void onBtnClick(View view) {
                float density = getResources().getDisplayMetrics().density;
                layout = tv.getLayout();
                int line_top = 0;
                int previous_line = 0;
                for (int i = 0; i < layout.getLineCount(); i++) {
                        line_top = layout.getLineTop(i);
                        Log.d("bug", "Text Size: "
                                        + (int) (tv.getTextSize() / density + 0.5f)
                                        + "  line_top: " + line_top + "  curr - prev: "
                                        + (line_top - previous_line));
                        previous_line = line_top;
                }
        }
}

Set 'bug' as Log filter..

Nexus7 emulator,

TextView text size 10sp:

Text Size: 10  line_top:  0  curr - prev: 0
Text Size: 10  line_top: 17  curr - prev: 17
Text Size: 10  line_top: 32  curr - prev: 15
Text Size: 10  line_top: 47  curr - prev: 15
Text Size: 10  line_top: 62  curr - prev: 15

*** The first's line height is 17, the rest lines are 15
*** 17 - 15 = 2 => 0.2 of the text size.

TextView text size 20sp:

Text Size: 20  line_top:   0  curr - prev: 0
Text Size: 20  line_top:  36  curr - prev: 36
Text Size: 20  line_top:  68  curr - prev: 32
Text Size: 20  line_top: 100  curr - prev: 32
Text Size: 20  line_top: 132  curr - prev: 32

*** Same with text size 20.. 36 - 32 = 4 => 0.2 of the text size.

TextView text size 30sp:

Text Size: 30  line_top:   0  curr - prev: 0
Text Size: 30  line_top:  53  curr - prev: 53
Text Size: 30  line_top: 100  curr - prev: 47
Text Size: 30  line_top: 147  curr - prev: 47
Text Size: 30  line_top: 194  curr - prev: 47

*** Same with text size 30.. 53 - 47 = 6 => 0.2 of the text size.

Also done with Nexus S emulator and SG4 real device. Same 0.2 scale error.