在TextView中更改textSize

Question

In this code below from an android application on android studio, I have a LinearLayout that contains a TextView whose size I want to change for example say from 100 to 20. But the thing is, whenever I change the android:textSize="100.0dip" to any other number, the size still remains the same in the application when running it on my phone.

Code:

<ScrollView
    android:id="@id/qp_body_wrapper"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_above="@id/widget34"
    android:layout_below="@id/widget99"
    android:layout_marginBottom="5.0dip"
    android:layout_marginTop="10.0dip"
    android:clickable="true"
    android:focusable="true"
    android:foregroundGravity="right">

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@id/qp_body_wrapper_container"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:focusable="true"
        android:orientation="vertical">

        <TextView
            android:id="@id/qp_body"
            style="@style/QuoteViewText"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/dashboard_qod_bg"
            android:clickable="true"
            android:focusable="true"
            android:gravity="right"
            android:padding="10.0dip"
            android:textAlignment="viewEnd"
            android:textColor="#FFFFFF"
            android:textSize="100.0dip"
            tools:ignore="RtlCompat,RtlHardcoded" />
    </LinearLayout>
</ScrollView>

and here is the QuoteViewText style :

<style name="QuoteViewText">
        <item name="android:textSize">100.0dip</item>
        <item name="android:typeface">serif</item>
        <item name="android:textStyle">bold</item>
        <item name="android:textColor">#fffcfcfc</item>
        <item name="android:shadowColor">#ff102e46</item>
        <item name="android:shadowDx">0.0</item>
        <item name="android:shadowDy">1.0</item>
        <item name="android:shadowRadius">2.0</item>
    </style>

Answer 1

You are setting textview size 2 times one from applying style and another from applying textsize for the textview. Use any one. And for texts use sp instead of dp to honour user preferences.

Answer 2

Text size is measured in sp - Scale-independent Pixels.

So, in your case you should use

<item name="android:textSize">100sp</item>

instead

<item name="android:textSize">100.0dip</item>

Also, don't forget that style is overrided by properties from your layout, in this case you should remove android:textSize from your TextView and leave it just in styles. Also you should start from a text size of 10, 100 is to big and never used.

Answer 3

You are using dip , instead you should sp for textSize .

you can update your code files with these below files , it will solve your problem

<ScrollView
    android:id="@id/qp_body_wrapper"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_above="@id/widget34"
    android:layout_below="@id/widget99"
    android:layout_marginBottom="5.0dip"
    android:layout_marginTop="10dp"
    android:clickable="true"
    android:focusable="true"
    android:foregroundGravity="right">

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@id/qp_body_wrapper_container"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:focusable="true"
        android:orientation="vertical">

        <TextView
            android:id="@id/qp_body"
            style="@style/QuoteViewText"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/dashboard_qod_bg"
            android:clickable="true"
            android:focusable="true"
            android:gravity="right"
            android:padding="10dpp"
            android:textAlignment="viewEnd"
            android:textColor="#FFFFFF"
            tools:ignore="RtlCompat,RtlHardcoded" />
    </LinearLayout>
</ScrollView>

and here is the QuoteViewText style :

 <style name="QuoteViewText">
            <item name="android:textSize">100sp</item>
            <item name="android:typeface">serif</item>
            <item name="android:textStyle">bold</item>
            <item name="android:textColor">#fffcfcfc</item>
            <item name="android:shadowColor">#ff102e46</item>
            <item name="android:shadowDx">0.0</item>
            <item name="android:shadowDy">1.0</item>
            <item name="android:shadowRadius">2.0</item>
        </style>

Answer 4

Tip : Use dimens.xml to store your concrete values for easier and cleaner code management.

Besides the change from dip to sp and the superfluous double setting of textSize , there is no problem with your TextView code and it should work fine. There some other small issues as possibly using @+id/qp_body instead and using match_parent instead of the deprecated fill_parent , but still it should be working.

This is shooting in the dark, but check, if you are not somehow overwriting the value programatically in code. If not, you could always try to and see what happens:

TextView mTextView = (TextView) findViewById(R.id.qp_body);
mTextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20f);

Or using a dimension resource:

TextView mTextView = (TextView) findViewById(R.id.qp_body);
mTextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, getResources().getDimension(R.dimen.my_text_size));

Answer 5

您正在使用textsize中的dip ，而不是仅使用dp或sp .dp和sp都可以使用，但通常在textview中，我们使用sp 。