用于设置自定义字体的自定义字体的内存泄漏

问题描述

以下用于设置自定义字体的代码会降低我的整个应用程序的速度.如何修改它以避免内存泄漏并提高速度和管理内存?

The following code for setting custom fonts slows down my whole app. how do i modify it to avoid memory leaks and increase the speed and manage memory well?

public class FontTextView extends TextView {
    private static final String TAG = "FontTextView";

    public FontTextView(Context context) {
        super(context);
    }

    public FontTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setCustomFont(context, attrs);
    }

    public FontTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setCustomFont(context, attrs);
    }

    private void setCustomFont(Context ctx, AttributeSet attrs) {
        TypedArray a = ctx.obtainStyledAttributes(attrs, R.styleable.FontTextView);
        String customFont = a.getString(R.styleable.FontTextView_customFont);
        setCustomFont(ctx, customFont);
        a.recycle();
    }

    public boolean setCustomFont(Context ctx, String asset) {
        Typeface tf = null;
        try {
        tf = Typeface.createFromAsset(ctx.getAssets(),"fonts/"+ asset);  
        } catch (Exception e) {
            Log.e(TAG, "Could not get typeface: "+e.getMessage());
            return false;
        }

        setTypeface(tf);  
        return true;
    }
    }

推荐答案

你应该缓存 TypeFace，否则 你可能会冒着旧手机内存泄漏的风险.缓存也会提高速度，因为从资源中读取并不是非常快.

You should cache the TypeFace, otherwise you might risk memory leaks on older handsets. Caching will increase speed as well since it's not super fast to read from assets all the time.

public class FontCache {

    private static Hashtable<String, Typeface> fontCache = new Hashtable<String, Typeface>();

    public static Typeface get(String name, Context context) {
        Typeface tf = fontCache.get(name);
        if(tf == null) {
            try {
                tf = Typeface.createFromAsset(context.getAssets(), name);
            }
            catch (Exception e) {
                return null;
            }
            fontCache.put(name, tf);
        }
        return tf;
    }
}

我提供了一个完整示例，说明如何加载自定义字体和样式文本视图作为类似问题的答案.您似乎大部分都做对了，但您应该按照上面的建议缓存字体.

I gave a full example on how to load custom fonts and style textviews as an answer to a similar question. You seem to be doing most of it right, but you should cache the font as recommended above.

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