java - 如何在 ImageView android上绘制文本

Question

我有一个应用程序可以计算手机使用时间，您可以在社交网络上分享它，而不是普通的 gettext() 我想将结果放在图像上并将其保存到手机上。如何创建可保存到手机的包含自定义文本的图像？

Answer 1

您想要做的是绘制链接到位图的 Canvas ，并保存位图。下面是一些代码，您应该能够将它们串在一起以使其工作。请注意，您仍然必须在 getBitmap() 函数中将绘画添加到 Canvas 。

private Bitmap getBitmap() {
    Bitmap bitmap = Bitmap.createBitmap(mPieToss.getWidth(),
            mPieToss.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    // Draw things to your canvas. They will be included as your BitMap, which is saved later on


    return bitmap;
}

public void save() {
    Bitmap bitmap = getBitmap();

    File path = Environment
            .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    String timestamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
            .format(new Date());

    String filename = "Imagen_" + timestamp + ".jpg";
    File file = new File(path, filename);
    FileOutputStream stream;
    // This can fail if the external storage is mounted via USB
    try {
        stream = new FileOutputStream(file);
        bitmap.compress(CompressFormat.PNG, 100, stream);
        stream.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    mUri = Uri.fromFile(file);

    bitmap.recycle();
}