如何在firebase中以列表视图显示数据（包含与用户电子邮件相同的电子邮件的区块）
我想显示使用他的邮件存储在firebase中登录的用户的ListView中的数据。例如登录用户的邮件是[email protected]，并且ListView显示块块中的所有项目表示存储在firebase中的用户或项目的完整详细信息。例如，有一本书，firebase包含它的书名，内容，描述，doi，作者姓名等。我想要的是，如果作者登录只有他的书会显示书名，说明，内容和doi（书籍参考只是一个例子）。我的问题是我的列表视图显示有关作业的所有项目，包括属于其他用户的项目，我希望用户只编辑他自己发布的作业。那么，我应该写什么firebase查询来实现这一点，这里是我的代码。如何在firebase中以列表视图显示数据（包含与用户电子邮件相同的电子邮件的区块）
火力
Firebase
Java类
public class WorkActivity extends AppCompatActivity { ListView lv;
Button ShowButton;
// Define a String ArrayList for the job
private ArrayList<String> jobdes=new ArrayList<>();
// Define an ArrayAdapter for the list
private ArrayAdapter<String> arrayAdapter;
// Declaring String variable (In which we are storing firebase serverURL).
public static final String Firebase_Server_URL = "https://jobaps70.firebaseio.com/";
public static final String Firebase_Server_URL1 = "https://jobaps70.firebaseio.com/jobs";
// Declaring String variables to store name & phone number get from EditText.
String PriceHolder, JobDescriptionHolder;
FirebaseHelper helper;
// Declaring Firebase object.
Firebase firebase,firebase1;
// Creating FirebaseAuth.
FirebaseAuth firebaseAuth ;
// Creating FirebaseAuth.
FirebaseUser firebaseUser;
// Creating Boolean variable that holds EditText is empty or not status.
Boolean EditTextStatus ;
TextView ShowDataTextView ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_work_jobs);
// Actionbar
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setIcon(R.drawable.logo);
getSupportActionBar().setBackgroundDrawable(new
ColorDrawable(getResources().getColor(R.color.Snow)));
ShowButton = (Button)findViewById(R.id.show);
// Adding MainActivity context into Firebase context.
Firebase.setAndroidContext(WorkActivity.this);
// Passing firebase Server URL into firebase object.
firebase = new Firebase(Firebase_Server_URL);
firebase1=new Firebase(Firebase_Server_URL1);
firebaseAuth = FirebaseAuth.getInstance();
// On activity start check whether there is user previously logged in or not.
if(firebaseAuth.getCurrentUser() == null){
// Finishing current Profile activity.
finish();
// If user already not log in then Redirect to LoginActivity .
Intent intent = new Intent(WorkActivity.this, LoginActivity.class);
startActivity(intent);
// Showing toast message.
Toast.makeText(WorkActivity.this, "Please Log in to continue",
Toast.LENGTH_LONG).show();
}
// Adding firebaseAuth current user info into firebaseUser object.
firebaseUser = firebaseAuth.getCurrentUser();
// Getting logged in user email from firebaseUser.getEmail() method and set into TextView.
setTitle(firebaseUser.getEmail());
setTitleColor(R.color.DarkGray);
firebase.child("jobs");
// Associate the jobs' list with the corresponding ListView
lv = (ListView) findViewById(R.id.lvshow);
// Set the ArrayAdapter to the ListView
arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, jobdes);
lv.setAdapter(arrayAdapter);
// Attach a ChildEventListener to the teacher database, so we can retrieve the job entries
firebase.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
// Get the value from the DataSnapshot and add it to the jobs' list
JobDetails jo = (JobDetails) dataSnapshot.getValue(JobDetails.class);
String joString = String.valueOf(jo);
arrayAdapter.add(joString);
//
// Notify the ArrayAdapter that there was a change
arrayAdapter.notifyDataSetChanged();
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(FirebaseError databaseError) {
}
});
}
}
的JobDetail
public class JobDetails { private String price;
private String jobDescription;
private String jobSpinner;
public String email;
public JobDetails() {
// This is default constructor.
}
public String getPrice() {
return price;
}
public void setPrice(String pri) {
this.price = pri;
}
public String getjobDescription() {
return jobDescription;
}
public void setjobDescription(String jobd) {
this.jobDescription = jobd;
}
public void setjob(String jry) {
this.jobSpinner = jry ;
}
public String getjob() {
return jobSpinner;
}
public void setemail(String jel) {
this.email = jel ;
}
public String getemail() {
return email;
}
@Override
public String toString() {
return this.jobSpinner + ": " + this.jobDescription+ ": " +price;
}
}
XML
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.gumption.zeeshanahmed.jobaps.WorkActivity">
<TextView
android:id="@+id/textdispjobs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/text_display_jobs"
android:textSize="40sp"
android:textAlignment="center"/>
<ListView
android:id="@+id/lvshow"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentStart="true"
android:layout_below="@+id/show" />
</RelativeLayout>
来自其他用户目前它显示的项目也是如此。 如果有人能帮助我，这将是非常有益的。谢谢！
回答：
如果您在用户第一次创建帐户时设置了电子邮件，则只有在Firebase中使用getEmail（）函数才会返回电子邮件。要设置自己的电子邮件，你必须这样做：
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser(); user.updateEmail("[email protected]");
如果您想了解更多关于这一点，this is where I got this code from
然后，您可以使用getEmail功能。否则，如果你想从JobDetails类的电子邮件，获得的电子邮件在您的childEventListener：
JobDetails jo = (JobDetails) dataSnapshot.getValue(JobDetails.class); //This getEmail function is provided in the JobDetails class
String email = jo.getEmail();
编辑：
既然你是想只得到当前用户已经显示作业/添加，您需要先获取用户的电子邮件。假设你设置用户的基于它们的UID的数据库信息，你可以做这样的事情来获得当前用户：
private User curr_user; private String mUserId;
mUserId = FirebaseAuth.getInstance.getUid();
DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference();
//Replace this path to wherever you stored your users
mDatabase.child("users").child(mUserId).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
curr_user = dataSnapshot.getValue(User.class);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
现在，你可以通过作业的孩子获得张贴的工作循环当前用户的电子邮件：
firebase.addChildEventListener(new ChildEventListener() { @Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
// Get the value from the DataSnapshot and add it to the jobs' list
JobDetails jo = (JobDetails) dataSnapshot.getValue(JobDetails.class);
String joString = String.valueOf(jo);
if (jo.getEmail() == curr_user.getEmail()) {
arrayAdapter.add(joString);
}
// Notify the ArrayAdapter that there was a change
arrayAdapter.notifyDataSetChanged();
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(FirebaseError databaseError) {
}
});
以上是 如何在firebase中以列表视图显示数据（包含与用户电子邮件相同的电子邮件的区块） 的全部内容， 来源链接： utcz.com/qa/261797.html
