我正在研究一个模因发生器。现在,我正在尝试从我的设备上传照片,通过Canvas
在照片上添加标题,并通过在其中创建一个新文件夹将新位图保存到我设备的“图库”应用程序中。这是我的尝试:
public void createBitmapAndSave(ImageView img){
BitmapDrawable bitmapDrawable = ((BitmapDrawable) img.getDrawable());
Bitmap bitmap = bitmapDrawable.getBitmap();
Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(mutableBitmap);
Paint paint = new Paint();
String topText = topTextView.getText().toString();
String bottomText = bottomTextView.getText().toString();
canvas.drawText(topText, 0, 0, paint);
canvas.drawText(bottomText, 50, 50, paint);
File file;
String path = Environment.getExternalStorageDirectory().toString();
file = new File(path, "Meme" + ".jpg");
try{
OutputStream stream = null;
stream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG,100,stream);
stream.flush();
stream.close();
}catch (IOException e){ e.printStackTrace(); }
}
我在我的BroadcastReceiver
中调用方法:
private BroadcastReceiver listener = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent ) {
String data = intent.getStringExtra("DATA");
Toast.makeText(context, data + " received", Toast.LENGTH_SHORT).show();
createBitmapAndSave(imageView);
}
};
目前,我甚至不确定位图的编辑或保存是否有效,因为我在应用程序的文件夹中找不到它。
UPDATE
我发现了这个问题。我决定在try / catch块中放置一个toast消息,看看该流是否正常工作,因为它在try / catch块之外,我会在每次运行时看到它。这就是我做的:
public void createBitmapAndSave(ImageView img){
BitmapDrawable bitmapDrawable = ((BitmapDrawable) img.getDrawable());
Bitmap bitmap = bitmapDrawable.getBitmap();
Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(mutableBitmap);
Paint paint = new Paint();
String topText = topTextView.getText().toString();
String bottomText = bottomTextView.getText().toString();
canvas.drawText(topText, 0, 0, paint);
canvas.drawText(bottomText, 50, 50, paint);
File file;
String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getAbsolutePath();
file = new File(path, "Meme" + ".jpg");
try{
OutputStream stream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG,100,stream);
stream.flush();
stream.close();
Toast.makeText(getContext(), path, Toast.LENGTH_SHORT).show();
}catch (IOException e){ e.printStackTrace();}
}
现在,我根本没有看到吐司的消息。看起来流甚至没有正常工作,但我不明白为什么它不会。
不要使用String path = Environment.getExternalStorageDirectory().toString();
它会将您的文件存储在用户看不到的私有存储中。
使用File path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);