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要在Android中使用图片水印#xff0c;并且能够在线下载字体并应用于水印#xff0c;可以按照以下步骤进行#xff1a;
1.使用Picasso、Glide或其他图片加载库加载图片#xff1a;
ImageView imageV…Android中使用图片水印并且能够在线下载字体并应用于水印
要在Android中使用图片水印并且能够在线下载字体并应用于水印可以按照以下步骤进行
1.使用Picasso、Glide或其他图片加载库加载图片
ImageView imageView findViewById(R.id.image_view);
String imageUrl https://example.com/image.jpg;
Picasso.get().load(imageUrl).into(imageView);
2.创建一个带有水印的Drawable
BitmapDrawable watermarkDrawable createWatermarkDrawable(Watermark Text, font.ttf, 16);
3.创建水印的方法
private BitmapDrawable createWatermarkDrawable(String text, String fontPath, int textSize) {Typeface typeface Typeface.createFromFile(fontPath);// 创建一个空白的Bitmap作为画布Bitmap bitmap Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888);Canvas canvas new Canvas(bitmap);// 设置画布属性Paint paint new Paint(Paint.ANTI_ALIAS_FLAG);paint.setColor(Color.WHITE);paint.setTextSize(textSize);paint.setTypeface(typeface);paint.setTextAlign(Paint.Align.LEFT);// 测量文本的宽度和高度Rect textBounds new Rect();paint.getTextBounds(text, 0, text.length(), textBounds);// 计算水印的位置int x (bitmap.getWidth() - textBounds.width()) / 2;int y (bitmap.getHeight() textBounds.height()) / 2;// 在画布上绘制文本canvas.drawText(text, x, y, paint);return new BitmapDrawable(getResources(), bitmap);
}
4.将水印应用到图片上
Drawable imageDrawable imageView.getDrawable();
Drawable[] layers new Drawable[2];
layers[0] imageDrawable;
layers[1] watermarkDrawable;
LayerDrawable layerDrawable new LayerDrawable(layers);
imageView.setImageDrawable(layerDrawable);
5.在线下载字体文件 你可以使用DownloadManager来下载字体文件并在下载完成后将其应用于水印
private void downloadFont(String fontUrl, String fontName) {DownloadManager downloadManager (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);DownloadManager.Request request new DownloadManager.Request(Uri.parse(fontUrl));request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fontName);long downloadId downloadManager.enqueue(request);// 注册一个广播接收器监听下载完成事件BroadcastReceiver onCompleteReceiver new BroadcastReceiver() {Overridepublic void onReceive(Context context, Intent intent) {long receivedDownloadId intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);if (receivedDownloadId downloadId) {// 下载完成应用字体String fontPath Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath() / fontName;BitmapDrawable updatedWatermarkDrawable createWatermarkDrawable(Watermark Text, fontPath, 16);Drawable[] updatedLayers new Drawable[2];updatedLayers[0] imageDrawable;updatedLayers[1] updatedWatermarkDrawable;LayerDrawable updatedLayerDrawable new LayerDrawable(updatedLayers);imageView.setImageDrawable(updatedLayerDrawable);// 注销广播接收器unregisterReceiver(this);}}};registerReceiver(onCompleteReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
例子中使用了DownloadManager来下载字体文件并在下载完成后应用于水印。请注意在AndroidManifest.xml中你需要添加相关权限声明
uses-permission android:nameandroid.permission.INTERNET/
uses-permission android:nameandroid.permission.WRITE_EXTERNAL_STORAGE/
另外记得在合适的时机调用
downloadFont
方法并提供正确的字体文件URL和文件名。
