所以我有一个带有ImageViews的SettingsActivity / layout，可以将图像从我的手机库上传到这些ImageViews，然后再将它们上传到firebase。当前有3个编辑视图，并且一切正常，直到我想尝试以下操作为止：
现在，我希望有能力在满足某些条件时增加ImageViews的数量。为此，我决定将ImageViews从此活动移至片段活动，然后我创建了另一个ImageViews加倍的活动。这些ImageView的上载/下载的所有代码都在SettingsActivity中进行。最好的方法是什么？我尝试将所有代码移到片段活动中，但最终遇到了太多问题。在SettingsActivity中的片段中使用这些图像视图的最佳方法是什么（我有onclick侦听器和其他需要图像视图的东西）：
SettingsActivity.Java
public class SettingsActivity extends AppCompatActivity {
private ImageView mImage1, mImage2, mImage3;
private String image1Url, image2Url, image3Url;
public static FragmentManager fragmentManager;
final int MaxTags = 5;
private int MaxImages = 3;
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
fragmentManager = getSupportFragmentManager();
if(findViewById(R.id.profileImageContainer) != null){
if(savedInstanceState!=null)
return;
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
SettingsDefault settingsDefault = new SettingsDefault();
fragmentTransaction.add(R.id.profileImageContainer, settingsDefault, null);
fragmentTransaction.commit();
}
getUserInfo();
mImage1 = findViewById(R.id.image1);
mImage2 = findViewById(R.id.image2);
mImage3 = findViewById(R.id.image3);
mUserDb = FirebaseDatabase.getInstance().getReference().child("Users").child(userId);
mImage1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, 1);
}
});
mImage2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, 2);
}
});
mImage3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, 3);
}
});
ArrayAdapter<String> values;
private void getUserInfo() {
mUserDb.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if(dataSnapshot.exists() && dataSnapshot.getChildrenCount()>0){
Map<String, Object> map = (Map<String, Object>) dataSnapshot.getValue();
if(map.get("phone") != null){
phone = map.get("phone").toString();
mPhoneField.setText(phone);
}
if(map.get("sex") != null){
userSex = map.get("sex").toString();
}
Glide.clear(mImage1);
if(map.get("image1Url") != null){
image1Url = map.get("image1Url").toString();
switch(image1Url){
case "default":
mImage1.setImageResource(R.mipmap.ic_launcher);
break;
default:
Glide.with(getApplication()).load(image1Url).into(mImage1);
break;
}
}
if(map.get("image2Url") != null){
image2Url = map.get("image2Url").toString();
switch(image2Url){
case "default":
mImage2.setImageResource(R.mipmap.ic_launcher);
break;
default:
Glide.with(getApplication()).load(image2Url).into(mImage2);
break;
}
}
if(map.get("image3Url") != null){
image3Url = map.get("image3Url").toString();
switch(image3Url){
case "default":
mImage3.setImageResource(R.mipmap.ic_launcher);
break;
default:
Glide.with(getApplication()).load(image3Url).into(mImage3);
break;
}
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 1 && resultCode == Activity.RESULT_OK){
final Uri imageUri = data.getData();
final Uri resultUri = imageUri;
if(resultUri != null){
final StorageReference filePath = FirebaseStorage.getInstance().getReference().child("profileImages").child(userId).child("image1");
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(getApplication().getContentResolver(), resultUri);
} catch (IOException e) {
e.printStackTrace();
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 20, baos);
byte[] databytes = baos.toByteArray();
UploadTask uploadTask = filePath.putBytes(databytes);
uploadTask.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast toast = Toast.makeText(SettingsActivity.this, "Upload Failed! Please try again", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
filePath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
Map newImage = new HashMap();
newImage.put("image1Url", uri.toString());
mUserDb.updateChildren(newImage);
mImage1.setImageURI(resultUri);
Toast toast = Toast.makeText(SettingsActivity.this, "Upload Successful!", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
Toast toast = Toast.makeText(SettingsActivity.this, "Upload Failed! Please try again", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
}
});
}else{
finish();
}
}
if(requestCode == 2 && resultCode == Activity.RESULT_OK){
final Uri imageUri = data.getData();
final Uri resultUri = imageUri;
if(resultUri != null){
final StorageReference filePath = FirebaseStorage.getInstance().getReference().child("profileImages").child(userId).child("image2");
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(getApplication().getContentResolver(), resultUri);
} catch (IOException e) {
e.printStackTrace();
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 20, baos);
byte[] databytes = baos.toByteArray();
UploadTask uploadTask = filePath.putBytes(databytes);
uploadTask.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast toast = Toast.makeText(SettingsActivity.this, "Upload Failed! Please try again", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
filePath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
Map newImage = new HashMap();
newImage.put("image2Url", uri.toString());
mUserDb.updateChildren(newImage);
mImage2.setImageURI(resultUri);
Toast toast = Toast.makeText(SettingsActivity.this, "Upload Successful!", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
Toast toast = Toast.makeText(SettingsActivity.this, "Upload Failed! Please try again", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
}
});
}else{
finish();
}
}
if(requestCode == 3 && resultCode == Activity.RESULT_OK){
final Uri imageUri = data.getData();
final Uri resultUri = imageUri;
if(resultUri != null){
final StorageReference filePath = FirebaseStorage.getInstance().getReference().child("profileImages").child(userId).child("image3");
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(getApplication().getContentResolver(), resultUri);
} catch (IOException e) {
e.printStackTrace();
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 20, baos);
byte[] databytes = baos.toByteArray();
UploadTask uploadTask = filePath.putBytes(databytes);
uploadTask.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast toast = Toast.makeText(SettingsActivity.this, "Upload Failed! Please try again", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
filePath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
Map newImage = new HashMap();
newImage.put("image3Url", uri.toString());
mUserDb.updateChildren(newImage);
mImage3.setImageURI(resultUri);
Toast toast = Toast.makeText(SettingsActivity.this, "Upload Successful!", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
Toast toast = Toast.makeText(SettingsActivity.this, "Upload Failed! Please try again", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
}
});
}else{
finish();
}
}
}
}
SettingsDefault.Java（片段）
public class SettingsDefault extends Fragment {
ImageView mImageView1;
ImageView mImageView2;
ImageView mImageView3;
public SettingsDefault() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_settings_default, container, false);
mImageView1 = view.findViewById(R.id.image1);
mImageView2 = view.findViewById(R.id.image2);
mImageView3 = view.findViewById(R.id.image3);
return view;
}
public ImageView getImageView1(){
return mImageView1;
}
public ImageView getImageView2(){
return mImageView2;
}
public ImageView getImageView3(){
return mImageView3;
}
片段的布局（将ImageViews从SettingsActivity移动到此处）
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".Fragments.ProfileImages.SettingsUpgade1">
<!-- TODO: Update blank fragment layout -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginBottom="10sp"
android:weightSum="3">
<ImageView
android:layout_weight="0.5"
android:layout_width="0dp"
android:layout_height="100dp"
android:id="@+id/image1"
android:src="@mipmap/ic_launcher"
android:layout_margin="20sp"
android:scaleType="centerCrop"
/>
<ImageView
android:layout_weight="0.5"
android:layout_width="0dp"
android:layout_height="100dp"
android:id="@+id/image2"
android:src="@mipmap/ic_launcher"
android:layout_margin="20sp"
android:scaleType="centerCrop"
/>
<ImageView
android:layout_weight="0.5"
android:layout_width="0dp"
android:layout_height="100dp"
android:id="@+id/image3"
android:src="@mipmap/ic_launcher"
android:layout_margin="20sp"
android:scaleType="centerCrop"
/>
<ImageView
android:layout_weight="0.5"
android:layout_width="0dp"
android:layout_height="100dp"
android:id="@+id/image4"
android:src="@mipmap/ic_launcher"
android:layout_margin="20sp"
android:scaleType="centerCrop"
/>
<ImageView
android:layout_weight="0.5"
android:layout_width="0dp"
android:layout_height="100dp"
android:id="@+id/image5"
android:src="@mipmap/ic_launcher"
android:layout_margin="20sp"
android:scaleType="centerCrop"
/>
<ImageView
android:layout_weight="0.5"
android:layout_width="0dp"
android:layout_height="100dp"
android:id="@+id/image6"
android:src="@mipmap/ic_launcher"
android:layout_margin="20sp"
android:scaleType="centerCrop"
/>
</LinearLayout>
</FrameLayout>
答案 0 :(得分：0)
很简单！只需在您的活动和片段之间使用接口即可！！像下面的这个链接一样！
Communicating between a fragment and an activity - best practices
答案 1 :(得分：0)
感谢您提供信息。曾经看过使用似乎对简单任务有用的界面，但是随着活动中大量的imageviews的出现，它变得非常混乱，并且很难理解如何将界面与该应用程序结合使用。为了简化我的生活，我成功地设法将所有利用ImageViews的方法移至片段活动。现在，我将对其他片段执行相同的操作（唯一的区别是它具有两倍的imageviews），并且将使用bolean或其他东西在片段之间滑动。不知道这是否是最好的方法，特别是在性能方面，但是我运行了该应用程序，似乎还可以。