我的活动中有一个保存按钮，当我点击它时，我想返回上一个活动并保存信息。我必须点击按钮 5/6 次才能发生这种情况。它每次都会保存信息，但不会返回到之前的活动。每次我点击按钮时，数据都会被保存并再次启动相同的活动，而不是回到上一个活动。
如果我点击模拟器上的后退按钮，它会在实际返回上一个活动之前重新启动相同的活动 5/6 次。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
mNameField = (TextView) findViewById(R.id.tvWelcome);
mDogNameField = (EditText) findViewById(R.id.dogName);
mBioField = (EditText) findViewById(R.id.dogBio);
mProfileImage = (ImageView) findViewById(R.id.profileImage);
mBack = (Button) findViewById(R.id.back);
mSave = (Button) findViewById(R.id.save);
mLogout = findViewById(R.id.logOut);
mAuth = FirebaseAuth.getInstance();
userId = mAuth.getCurrentUser().getUid();
getUserInfo();
mLogout.setOnClickListener(v -> logOut());
mProfileImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//tells the phone that we need to access other features (gallery in this case)
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, 1);
}
});
mSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
saveUserInformation();
startActivity(new Intent(SettingsActivity.this,countySelection.class));
}
});
mBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(SettingsActivity.this, countySelection.class));
}
});
}
private void saveUserInformation() {
fname = mDogNameField.getText().toString();
bio = mBioField.getText().toString();
Map userInfo = new HashMap<>();
userInfo.put("fname", fname);
userInfo.put("bio", bio);
mUserDatabase.updateChildren(userInfo);
if (resultUri != null) {
StorageReference filepath = FirebaseStorage.getInstance().getReference().child("profileImages").child(userId);
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(getApplication().getContentResolver(), resultUri);
} catch (IOException e) {
e.printStackTrace();
}
//Compressing photo so it fits nicely
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 20, baos);
byte[] data = baos.toByteArray();
UploadTask uploadTask = filepath.putBytes(data);
uploadTask.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
finish();
}
});
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("profileImageUrl", uri.toString());
mUserDatabase.updateChildren(newImage);
finish();
// return;
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
finish();
// return;
}
});
}
});
} else {
finish();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1 && resultCode == Activity.RESULT_OK) {
final Uri imageUri = data.getData();
resultUri = imageUri;
mProfileImage.setImageURI(resultUri);
}
}
private void logOut(){
FirebaseAuth.getInstance().signOut();
Intent intent = new Intent(SettingsActivity.this, MainActivity.class);
startActivity(intent);
finish();
}
private void getUserInfo() {
mUserDatabase.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("name") != null) {
name = map.get("name").toString();
mNameField.setText("Welcome, " + name);
}
if (map.get("fname") != null) {
fname = map.get("fname").toString();
mDogNameField.setText(fname);
}
if (map.get("bio") != null) {
bio = map.get("bio").toString();
mBioField.setText(bio);
}
// Glide.clear(mProfileImage);
if (map.get("profileImageUrl") != null) {
profileImageUrl = map.get("profileImageUrl").toString();
switch (profileImageUrl) {
case "default":
mProfileImage.setImageResource(R.mipmap.ic_launcher);
break;
default:
Glide.with(getApplicationContext()).load(profileImageUrl).into(mProfileImage);
}
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
}
运行：
I/FirebaseApp: Device unlocked: initializing all Firebase APIs for app ONESIGNAL_SDK_FCM_APP_NAME
I/TetheringManager: registerTetheringEventCallback:com.example.a117478846_fyp
W/PersistentConnection: pc_0 - Using an unspecified index. Your data will be downloaded and filtered on the client. Consider adding '".indexOn": "county"' at Users to your security and Firebase Database rules for better performance
I/AssistStructure: Flattened final assist data: 2040 bytes, containing 1 windows, 12 views
I/AssistStructure: Flattened final assist data: 2040 bytes, containing 1 windows, 12 views
D/AutofillManager: onActivityFinishing(): calling cancelLocked()
I/AssistStructure: Flattened final assist data: 2040 bytes, containing 1 windows, 12 views
D/AutofillManager: onActivityFinishing(): calling cancelLocked()
D/AutofillManager: onActivityFinishing(): calling cancelLocked()
清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.a117478846_fyp">
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the "MyLocation" functionality.
-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<activity
android:name=".WalkerMapActivity"
android:label="@string/title_activity_walker_map" />
<service android:name=".Service.MyFCMService">
<intent-filter>
<action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
</intent-filter>
</service>
<activity android:name=".WelcomeActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".registerOption" />
<activity android:name=".ViewDogProfile" />
<activity android:name=".WalkerSettings" />
<meta-data
android:name="preloaded_fonts"
android:resource="@array/preloaded_fonts" />
<activity android:name=".Chat.ChatActivity" />
<activity android:name=".MatchesActivity" />
<activity android:name=".SettingsActivity" />
<activity android:name=".corkSwipe"/>
<activity android:name=".kerrySwipe"/>
<activity android:name=".clareSwipe"/>
<activity android:name=".limerickSwipe"/>
<activity android:name=".tipperarySwipe"/>
<activity android:name=".waterfordSwipe"/>
<activity android:name=".countySelection" />
<activity android:name=".OwnerMapActivity" />
<activity android:name=".RegisterDog" />
<activity android:name=".ForgotPassword" />
<activity android:name=".SignIn" />
<activity android:name=".RegisterWalker" />
<activity
android:name=".MainActivity"
android:label="Home Screen" />
</application>
</manifest>
之前的活动：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cork_swipe);
//save the notificationID to the database
OneSignal.startInit(this).init();
OneSignal.sendTag("User_ID", FirebaseAuth.getInstance().getCurrentUser().getUid());
OneSignal.setEmail(FirebaseAuth.getInstance().getCurrentUser().getEmail());
OneSignal.setInFocusDisplaying(OneSignal.OSInFocusDisplayOption.Notification);
OneSignal.idsAvailable((userId, registrationId) -> FirebaseDatabase.getInstance().getReference().child("Users").child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("notificationKey").setValue(userId));
Button btnEdit = (Button) findViewById(R.id.btnEdit);
Button btnMatches = (Button) findViewById(R.id.btnMatches);
usersDb = FirebaseDatabase.getInstance().getReference().child("Users");
name = (TextView) findViewById(R.id.tvName);
mAuth = FirebaseAuth.getInstance();
currentUId = mAuth.getCurrentUser().getUid();
checkUserType();
rowItems = new ArrayList<cards>();
arrayAdapter = new arrayAdapter(this, R.layout.item, rowItems);
SwipeFlingAdapterView flingContainer = (SwipeFlingAdapterView) findViewById(R.id.frame);
flingContainer.setAdapter(arrayAdapter);
flingContainer.setFlingListener(new SwipeFlingAdapterView.onFlingListener() {
@Override
public void removeFirstObjectInAdapter() {
// this is the simplest way to delete an object from the Adapter (/AdapterView)
Log.d("LIST", "removed object!");
rowItems.remove(0);
arrayAdapter.notifyDataSetChanged();
}
@Override
public void onLeftCardExit(Object dataObject) {
cards obj = (cards) dataObject;
String userId = obj.getUserId();
usersDb.child(userId).child("connections").child("no").child(FirebaseAuth.getInstance().getCurrentUser().getUid()).setValue(true);
Toast.makeText(corkSwipe.this, "left", Toast.LENGTH_SHORT).show();
}
@Override
public void onRightCardExit(Object dataObject) {
cards obj = (cards) dataObject;
String userId = obj.getUserId();
usersDb.child(userId).child("connections").child("yes").child(FirebaseAuth.getInstance().getCurrentUser().getUid()).setValue(true);
isConnectionMatch(userId);
Toast.makeText(corkSwipe.this, "right", Toast.LENGTH_SHORT).show();
}
@Override
public void onAdapterAboutToEmpty(int itemsInAdapter) {
}
@Override
public void onScroll(float scrollProgressPercent) {
}
});
// Optionally add an OnItemClickListener
flingContainer.setOnItemClickListener(new SwipeFlingAdapterView.OnItemClickListener() {
@Override
public void onItemClicked(int itemPosition, Object dataObject) {
Toast.makeText(corkSwipe.this, "clicked", Toast.LENGTH_SHORT).show();
}
});
FloatingActionButton fabLike = findViewById(R.id.fabLike);
FloatingActionButton fabNope = findViewById(R.id.fabNope);
fabLike.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (rowItems.size() != 0)
flingContainer.getTopCardListener().selectRight();
}
});
fabNope.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (rowItems.size() != 0)
flingContainer.getTopCardListener().selectLeft();
}
});
//https://stackoverflow.com/questions/64461357/how-to-redirect-to-different-pages-based-on-firebase-information?noredirect=1&lq=1
btnEdit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference("Users");
rootRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
String mail = dataSnapshot.child("userType").getValue().toString();
if (userType.equals("Dog Walker")) {
startActivity(new Intent(corkSwipe.this, WalkerSettings.class));
}
if (userType.equals("Dog Owner")) {
startActivity(new Intent(corkSwipe.this, testSettings.class));
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
});
}
private void isConnectionMatch(String userId) {
DatabaseReference currentUserConnectionDb = usersDb.child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("connections").child("yes").child(userId);
currentUserConnectionDb.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
Toast.makeText(corkSwipe.this, "New connection", Toast.LENGTH_LONG).show();
String key = FirebaseDatabase.getInstance().getReference().child("Chat").push().getKey();
usersDb.child(dataSnapshot.getKey()).child("connections").child("matches").child(currentUId).child("ChatId").setValue(key);
usersDb.child(currentUId).child("connections").child("matches").child(dataSnapshot.getKey()).child("ChatId").setValue(key);
SendNotification sendNotification = new SendNotification();
sendNotification.SendNotification("check it out!", "new Connection!", dataSnapshot.getKey());
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
private String userType;
private String oppositeUserType;
public void checkUserType() {
final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
DatabaseReference userDb = usersDb.child(user.getUid());
userDb.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
if (dataSnapshot.child("userType").getValue() != null) {
userType = dataSnapshot.child("userType").getValue().toString();
switch (userType) {
case "Dog Owner":
oppositeUserType = "Dog Walker";
break;
case "Dog Walker":
oppositeUserType = "Dog Owner";
break;
}
getOppositeUserType();
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
public void goToMatches(View view) {
Intent intent = new Intent(corkSwipe.this, MatchesActivity.class);
startActivity(intent);
return;
}
private void getOppositeUserType() {
usersDb.orderByChild("county").equalTo("Cork").addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
if (dataSnapshot.child("userType").getValue() != null) {
if (dataSnapshot.exists() && !dataSnapshot.child("connections").child("no").hasChild(currentUId) && !dataSnapshot.child("connections").child("yes").hasChild(currentUId) && dataSnapshot.child("userType").getValue().toString().equals(oppositeUserType)) {
String profileImageUrl = "default";
// if(dataSnapshot.child("profileImageUrl").getValue() != null){
if (!dataSnapshot.child("profileImageUrl").getValue().equals("default")) {
profileImageUrl = dataSnapshot.child("profileImageUrl").getValue().toString();
// Query query = FirebaseDatabase.getInstance().getReference("Users")
// .orderByChild("county")
// .equalTo(county);
// query.addListenerForSingleValueEvent(valueEventListener);
}
cards item = new cards(dataSnapshot.getKey(), dataSnapshot.child("fname").getValue().toString(), dataSnapshot.child("county").getValue().toString(), dataSnapshot.child("bio").getValue().toString(), profileImageUrl);
rowItems.add(item);
arrayAdapter.notifyDataSetChanged();
}
}
}
@Override
public void onChildChanged(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
}
@Override
public void onChildRemoved(@NonNull DataSnapshot snapshot) {
}
@Override
public void onChildMoved(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
ValueEventListener valueEventListener = new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
rowItems.clear();
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
};
}
县选择活动，这是向用户展示地图的地方，他们点击其中一个县，只显示来自该县的用户。
package com.example.a117478846_fyp;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class countySelection extends AppCompatActivity {
private Button cork, kerry, waterford, tipperary, limerick, clare;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_county_selection);
cork = (Button) findViewById(R.id.cork);
kerry = (Button) findViewById(R.id.kerry);
waterford = (Button) findViewById(R.id.waterford);
tipperary = (Button) findViewById(R.id.tipperary);
limerick = (Button) findViewById(R.id.limerick);
clare = (Button) findViewById(R.id.clare);
cork.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(countySelection.this, corkSwipe.class));
}
}); kerry.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(countySelection.this, kerrySwipe.class));
}
}); waterford.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(countySelection.this, waterfordSwipe.class));
}
}); tipperary.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(countySelection.this, tipperarySwipe.class));
}
}); limerick.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(countySelection.this, limerickSwipe.class));
}
});
clare.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(countySelection.this, clareSwipe.class));
}
});
}
}
有谁知道如何让它保存信息并在第一次点击时返回上一个活动？
答案 0 :(得分：0)
您正在循环启动多个活动：
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
...
startActivity(new Intent(corkSwipe.this, WalkerSettings.class));
我相信这将导致 6 个活动实例，然后通过调用完成（）一一关闭。