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Use typeface to set the text font of textview

2022-07-24 12:30:00 【Sharp surge】

stay Android There is a TextView The color and size of the text , All very simple. , It's also a common basic function . But very few of them set the font of the text , What we want to share today is through TypeFace To set up TextView The text of , There are two in the layout Button, There are two small functions ： Change the font and make it bigger .

The core part of the function is mainly two points ：

establish assets External resources folder , take ttf The font file in this format is placed in this directory

adopt TypeFace Class createFromAsset Method , Give Way TextView adopt setTypeFace To change the font

The complete source code is as follows ：

1、 Lord Activity, Pay attention to the comments in the code ：

import android.app.Activity;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.example.memorydemo.R;
  
public class ChangeFontActivity extends Activity implements View.OnClickListener {
  private TextView textViewFont;
  
  @Override
  protected void onCreate(Bundle onSavedInstance) {
    super.onCreate(onSavedInstance);
    setContentView(R.layout.change_textview_font);
  
    textViewFont = findViewById(R.id.textViewFont);
    Button btnChangeFont = findViewById(R.id.buttonChangeFont);
    Button btnAmplify = findViewById(R.id.buttonAmplify);
    btnChangeFont.setOnClickListener(this);
    btnAmplify.setOnClickListener(this);
  }
  
  @Override
  public void onClick(View view) {
    switch (view.getId()) {
      case R.id.buttonChangeFont:
  
        //  Here I am from Android framework I picked any font in the directory 
        textViewFont.setTypeface(Typeface.createFromAsset(getAssets(), "fonts/BitMDL2.ttf"));
  
        //  Direct will  ttf  Files in  assets  It's OK under the directory 
        // textViewFont.setTypeface(Typeface.createFromAsset(getAssets(), "BitMDL2.ttf"));
        break;
  
      case R.id.buttonAmplify:
        //  The default size in the layout is  12 SP, Here, set the font size to  24 SP, Easy to see 
        textViewFont.setTextSize(24);
        break;
  
      default:
        break;
    }
  }
}

The storage directory structure of font file is as follows （ttf Font files can be placed directly in assets Catalog , It can also be in assets Next, create a new directory , For example, I built a floor fonts Catalog ）：

2、 Layout file change_textview_font.xml

<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

<TextViewandroid:layout_width="wrap_content"android:layout_height="60dp"

android:id="@+id/textViewFont"android:layout_gravity="center"

android:text="This is a Font"

android:textSize="12sp"

android:paddingTop="20dp"/>

<Button

android:text=" Change the font "

android:layout_width="wrap_content"

android:layout_gravity="center"

android:layout_height="60dp"android:id="@+id/buttonChangeFont"/>

<Button

android:text=" Bigger "

android:layout_width="wrap_content"

android:layout_gravity="center"

android:layout_marginTop="15dp"

android:layout_height="60dp"android:id="@+id/buttonAmplify"/>

</LinearLayout>

3、 The renderings are as follows （ First click to make it bigger 、 Change the font again ）：

About Android The font of , There are two points to note ：

The font file must be ttf（True Type Font） Format , otherwise , Even if the program compiles correctly , The font cannot be changed at run time
at present Android There are some problems with supporting font files , That is, an unsupported font is used ,Android And there will be no mistakes , It's in the default font Droid Sans Replace . So if you use an external font and find that it doesn't change , The problem is Android The font is not supported , Not a program error

External fonts are used in this function , You can also call Typeface Static method of defaultFromStyle, Use native Fonts , It has the following constants , All are int type ：