我正在创建一个从 url 中提取图像并将它们放入 recyclerview 的应用程序。然后,用户可以访问这些图像并全屏查看。这是用毕加索实现的。我现在希望能够使用 onTouchEvent 或其他东西在 Picasso 加载的图像上进行手指绘画,但不知道该怎么做。
此类将图像设置为使用毕加索加载的 map_edit_gallery.xml:
public class EditMapImage extends AppCompatActivity {
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_edit_gallery);
checkIntent();
//Find savebutton
ImageButton saveMapButton = findViewById(R.id.saveEditImagebutton);
saveMapButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(),"Saved",Toast.LENGTH_SHORT).show();
}
});
}
//This will check to see if the intent extras exist and if they do get the extra
private void checkIntent(){
if(getIntent().hasExtra("image_url") && getIntent().hasExtra("name_url")){
String imageUrl = getIntent().getStringExtra("image_url");
String nameUrl = getIntent().getStringExtra("name_url");
setMapImage(imageUrl, nameUrl);
}
}
private void setMapImage(String imageUrl, String nameUrl){
//Set the Text view
TextView name = findViewById(R.id.mapNameEditor);
name.setText(nameUrl);
//Set the Image
ImageView imageView = findViewById(R.id.mapEditScreen);
Picasso.get().load(imageUrl).into(imageView);
Picasso picasso = Picasso.get();
DrawToImage myTransformation = new DrawToImage();
picasso.load(imageUrl).transform(myTransformation).into(imageView);
}
}
编辑: 此类允许我使用画布绘制加载的图像,但无法弄清楚如何使用触摸进行绘制:
public class DrawToImage implements Transformation {
@Override
public String key() {
// TODO Auto-generated method stub
return "drawline";
}
public Bitmap transform(Bitmap bitmap) {
// TODO Auto-generated method stub
synchronized (DrawToImage.class) {
if(bitmap == null) {
return null;
}
Bitmap resultBitmap = bitmap.copy(bitmap.getConfig(), true);
Canvas canvas = new Canvas(resultBitmap);
Paint paint = new Paint();
paint.setColor(Color.BLUE);
paint.setStrokeWidth(10);
canvas.drawLine(0, resultBitmap.getHeight()/2, resultBitmap.getWidth(), resultBitmap.getHeight()/2, paint);
bitmap.recycle();
return resultBitmap;
}
}
}