【发布时间】：2019-11-23 23:00:25
【问题描述】：
最近怎么样？我想知道是否有人对如何在同一活动中移动图像并调整其大小有任何想法？我设置了一个监听器来移动图像并且效果很好。注释掉的代码用于调整图像大小，效果也很好。但我正在努力弄清楚如何实现某种 GestureDetector 或类似的东西来做这两者。这是我到目前为止的代码：
private static final String TAG = "CreateOutfitActivity";
Context mContext;
ImageView bodyImage, outfitOne, close;
Button saveButton;
RecyclerView recyclerView;
Spinner spinner;
FirebaseAuth mAuth;
String currentUserID;
DatabaseReference privateUserReference;
String CategoryKey;
List<String> spinnerArray = new ArrayList<>();
private ScaleGestureDetector scaleGestureDetector;
ViewGroup rootLayout;
private int _xDelta;
private int _yDelta;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_outfits);
mContext = CreateOutfitActivity.this;
deployWidgets();
setupRecyclerView();
setupFirebase();
setupSpinner();
}
private void deployWidgets(){
bodyImage = findViewById(R.id.bodyimage);
outfitOne = findViewById(R.id.image_view_one);
close = findViewById(R.id.close);
saveButton = findViewById(R.id.saveButton);
recyclerView = findViewById(R.id.outfit_recycler_view);
spinner = findViewById(R.id.spinner);
outfitOne.bringToFront();
rootLayout = findViewById(R.id.view_root);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(1000, 1000);
outfitOne.setLayoutParams(layoutParams);
outfitOne.setOnTouchListener(new ChoiceTouchListener());
}
private void setupRecyclerView(){
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(mContext, LinearLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(linearLayoutManager);
}
private void setupFirebase(){
mAuth = FirebaseAuth.getInstance();
currentUserID = mAuth.getCurrentUser().getUid();
privateUserReference = FirebaseDatabase.getInstance().getReference().child("private_user");
}
private void setupSpinner(){
spinnerArray.add("Cutouts");
spinnerArray.add("All Items");
spinnerArray.add("Accessories");
spinnerArray.add("Athletic");
spinnerArray.add("Casual");
spinnerArray.add("Dresses");
spinnerArray.add("Jackets");
spinnerArray.add("Jewelery");
spinnerArray.add("Other");
spinnerArray.add("Pants");
spinnerArray.add("Purses");
spinnerArray.add("Shirts");
spinnerArray.add("Shoes");
spinnerArray.add("Shorts");
spinnerArray.add("Suits");
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(mContext, android.R.layout.simple_spinner_item, spinnerArray);
arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(arrayAdapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String text = spinner.getItemAtPosition(position).toString().toLowerCase();
CategoryKey = text;
if (position == 1){
CategoryKey = text.replace("All Items", "all_items");
}
// if (text.equals("All Items")){
//
// }
queryFirebaseToDisplayCategory(CategoryKey);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
private void queryFirebaseToDisplayCategory(String CategoryKey){
Query query = privateUserReference.child(currentUserID).child(CategoryKey).orderByKey();
FirebaseRecyclerOptions<Category> firebaseRecyclerOptions =
new FirebaseRecyclerOptions.Builder<Category>().setQuery(query, Category.class).build();
FirebaseRecyclerAdapter<Category, OutfitViewHolder> firebaseRecyclerAdapter =
new FirebaseRecyclerAdapter<Category, OutfitViewHolder>(firebaseRecyclerOptions) {
@Override
protected void onBindViewHolder(@NonNull OutfitViewHolder outfitViewHolder, int i, @NonNull Category category) {
String PostKey = getRef(i).getKey();
Picasso.get().load(category.getFile_uri()).into(outfitViewHolder.recyclerImage);
outfitViewHolder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
privateUserReference.child(currentUserID).child(CategoryKey).child(PostKey)
.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
String fileURI = dataSnapshot.child("file_uri").getValue().toString();
displayRecyclerImage(fileURI);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
});
}
@NonNull
@Override
public OutfitViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.layout_outfit_item_view, parent, false);
return new OutfitViewHolder(view);
}
};
firebaseRecyclerAdapter.startListening();
recyclerView.setAdapter(firebaseRecyclerAdapter);
}
private void displayRecyclerImage(String fileURI){
if (fileURI != null){
Picasso.get().load(fileURI).into(outfitOne);
}
}
public class OutfitViewHolder extends RecyclerView.ViewHolder{
View mView = itemView;
ImageView recyclerImage;
public OutfitViewHolder(@NonNull View itemView) {
super(itemView);
recyclerImage = mView.findViewById(R.id.outfit_recycler_image);
}
}
private final class ChoiceTouchListener implements View.OnTouchListener {
public boolean onTouch(View view, MotionEvent event){
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
switch (event.getAction() & MotionEvent.ACTION_MASK){
case MotionEvent.ACTION_DOWN:
RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams)view.getLayoutParams();
_xDelta = X - lParams.leftMargin;
_yDelta = Y - lParams.topMargin;
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
break;
case MotionEvent.ACTION_MOVE:
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams)view.getLayoutParams();
layoutParams.leftMargin = X - _xDelta;
layoutParams.topMargin = Y - _yDelta;
layoutParams.rightMargin = -0;
layoutParams.bottomMargin = -0;
view.setLayoutParams(layoutParams);
break;
}
rootLayout.invalidate();
return true;
}
}
private class MySimpleOnScaleGestureListener
extends ScaleGestureDetector.SimpleOnScaleGestureListener{
ImageView viewMyImage;
float factor;
public MySimpleOnScaleGestureListener(ImageView iv) {
super();
viewMyImage = iv;
factor = 1.0f;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
float scaleFactor = detector.getScaleFactor() - 1;
factor += scaleFactor;
viewMyImage.setScaleX(factor);
viewMyImage.setScaleY(factor);
return true;
//return super.onScale(detector);
}
}
}```
【问题讨论】：
标签： android android-studio drag-and-drop gesture image-scaling