從url動態加載字體或從lib靜態加載字體

Question

我正在運行一個Android應用程序，我想動態加載字體並在運行時使用它。我怎樣才能做到這一點？

而且我該如何在我編寫的SDK中包含字體，在我編寫的應用程序中引用sdk，並使用SDK中包含的字體？

編輯：感謝您對此投了-1票，誰這樣做，我會停止分享知識，這是關閉我的好方法。

Answer 1

下面是我該怎麼做：（使用AsyncTask，這並不完美） 如果你想要比AsyncTask更穩定的東西RxAndroid提供了其他更好的變體，更穩定。 在這個示例中，我正在做「doInBackground」部分中的所有內容，但您可以在任務完成後的任何位置以相同方式使用它。 這個例子還假設我們有從外部存儲器寫入和讀取的保留。

private class DownloadTask extends AsyncTask<String, Integer, String> { 

    private Context context; 

    public DownloadTask(Context context) { 
     this.context = context; 
    } 

    @Override 
    protected String doInBackground(String... sUrl) { 
     InputStream input = null; 
     OutputStream output = null; 
     HttpURLConnection connection = null; 
     try { 
      URL url = new URL(sUrl[0]); 
      connection = (HttpURLConnection) url.openConnection(); 
      connection.connect(); 

      // expect HTTP 200 OK, so we don't mistakenly save error report 
      // instead of the file 
      if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) { 
       return "Server returned HTTP " + connection.getResponseCode() 
         + " " + connection.getResponseMessage(); 
      } 

      // download the file 
      input = connection.getInputStream(); 
      File sdCard = Environment.getExternalStorageDirectory(); 
      File dir = new File (sdCard.getAbsolutePath() + "/fonts"); 
      dir.mkdirs(); 
      File file = new File(dir, "font.ttf"); 
      try { 
       OutputStream out = new FileOutputStream(file); 
       byte[] buf = new byte[1024]; 
       int len; 
       while((len=input.read(buf))>0){ 
        out.write(buf,0,len); 
       } 
       out.close(); 
       input.close(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
      File sdcard = Environment.getExternalStorageDirectory(); 
      File dirs = new File(sdcard.getAbsolutePath()+"/fonts"); 

      if(dirs.exists()) { 
       File[] files = dirs.listFiles(); 
       Log.d("s","files"); 
      } 
      final Typeface typeface = Typeface.createFromFile(
        new File(Environment.getExternalStorageDirectory()+"/fonts", "font.ttf")); 
      Log.d("a","created"); 
      // Now I'm starting with an example that shows how to use 
      // this font on a textview of my choice. 
      // Assumptions: font has characters uF102 and uF104 
      final TextView tv = (TextView) findViewById(R.id.myTextView); 
      runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        if (tv != null && typeface != null) { 
         tv.setTypeface(typeface); 
         tv.setText("\uF102"); 
         tv.setOnClickListener(new View.OnClickListener() { 
          @Override 
          public void onClick(View v) { 
           if (tv.getText().equals("\uF102")){ 
            tv.setText("\uF104"); 
           } else { 
            tv.setText("\uF102"); 
           } 
          } 
         }); 
        } 
       } 
      }); 

     } catch (Exception e) { 
      return e.toString(); 
     } finally { 
      try { 
       if (output != null) 
        output.close(); 
       if (input != null) 
        input.close(); 
      } catch (IOException ignored) { 
      } 

      if (connection != null) 
       connection.disconnect(); 
     } 
     return null; 
    } 
} 

如果我們想從我們使用，從我們已經寫了一個庫，我們可以包括在繪製原料部分的字體的SDK加載字體，並從應用程序使用此SDK/lib下，我們可以參考的字體像這樣： （我用的amaticobold字體在這種情況下，只是舉例）

 File sdCard = Environment.getExternalStorageDirectory(); 
    File dir = new File (sdCard.getAbsolutePath() + "/fonts"); 
    dir.mkdirs(); 
    File file = new File(dir, "font.ttf"); 
    InputStream is = getResources().openRawResource(getResources().getIdentifier("amaticbold","raw", getPackageName())); 
    try { 
     OutputStream out = new FileOutputStream(file); 
     byte[] buf = new byte[1024]; 
     int len; 
     while((len=is.read(buf))>0){ 
      out.write(buf,0,len); 
     } 
     out.close(); 
     is.close(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
    File sdcard = Environment.getExternalStorageDirectory(); 
    File dirs = new File(sdcard.getAbsolutePath()+"/fonts"); 

    if(dirs.exists()) { 
     File[] files = dirs.listFiles(); 
     Log.d("s","files"); 
    } 
    final Typeface typeface = Typeface.createFromFile(
      new File(Environment.getExternalStorageDirectory()+"/fonts", "font.ttf")); 
    editText.setTypeface(typeface);