Android：应用程序从一个活动跳到第二个活动，而对第一个活动没有任何操作

Question

I have created a basic feedback app in which the main activity ( MainActivity.java ) records the name of the customer and the rating (1-5) in the form of imageViews and sends the data to firebase.

My second activity ( Score.java ) simply aggregates the ratings from all the customers in firebase.

My issue is the app on startup directly jumps to Score.java without collecting the feedback from the customer. Ps I am using Intent to jump between the activities.

Here is the code:

MainActivity-

package com.example.feedback;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;    
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import static android.os.SystemClock.sleep;

public class MainActivity extends AppCompatActivity {

    EditText name;
    ImageView oneStar, twoStar, threeStar, fourStar, fiveStar;
    Intent intent;
    FirebaseDatabase rootNode;
    DatabaseReference reference;

    public void displayScore() {
        intent = new Intent(getApplicationContext(), Score.class);
        startActivity(intent);
    }
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE); //will hide the title
        getSupportActionBar().hide(); // hide the title bar
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN); //enable full screen
        setContentView(R.layout.activity_main);
        name =  findViewById(R.id.editTextPersonName);
        oneStar =  findViewById(R.id.imageView1);
        twoStar =  findViewById(R.id.imageView2);
        threeStar = findViewById(R.id.imageView3);
        fourStar =  findViewById(R.id.imageView4);
        fiveStar =  findViewById(R.id.imageView5);
        oneStar.setTag(1);
        twoStar.setTag(2);
        threeStar.setTag(3);
        fourStar.setTag(4);
        fiveStar.setTag(5);

        oneStar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (name.length() == 0){
                    name.setError("Please enter your full name.");
                }
                else {
                    name.setError(null);
                    rootNode = FirebaseDatabase.getInstance();
                    reference = rootNode.getReference().child("Users");
                    //Fetch all values
                    String username = name.getText().toString();
                    String value = view.getTag().toString();
                    int rating = Integer.parseInt(value);
                    UserHelper helper = new UserHelper(username,rating);
                    reference.child(username).setValue(helper);
                    Toast.makeText(MainActivity.this, "Feedback submitted successfully!", Toast.LENGTH_SHORT).show();
                    sleep(200);
                    displayScore();
                }
            }
        });

        twoStar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (name.length() == 0){
                    name.setError("Please enter your full name.");
                }
                else {
                    name.setError(null);
                    rootNode = FirebaseDatabase.getInstance();
                    reference = rootNode.getReference().child("Users");
                    //Fetch all values
                    String username = name.getText().toString();
                    String value = view.getTag().toString();
                    int rating = Integer.parseInt(value);
                    UserHelper helper = new UserHelper(username,rating);
                    reference.child(username).setValue(helper);
                    Toast.makeText(MainActivity.this, "Feedback submitted successfully!", Toast.LENGTH_SHORT).show();
                    displayScore();
                }
            }
        });

        threeStar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (name.length() == 0){
                    name.setError("Please enter your full name.");
                }
                else {
                    name.setError(null);
                    rootNode = FirebaseDatabase.getInstance();
                    reference = rootNode.getReference().child("Users");
                    //Fetch all values
                    String username = name.getText().toString();
                    String value = view.getTag().toString();
                    int rating = Integer.parseInt(value);
                    UserHelper helper = new UserHelper(username,rating);
                    reference.child(username).setValue(helper);
                    Toast.makeText(MainActivity.this, "Feedback submitted successfully!", Toast.LENGTH_SHORT).show();
                    displayScore();
                }
            }
        });

        fourStar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (name.length() == 0){
                    name.setError("Please enter your full name.");
                }
                else {
                    name.setError(null);
                    rootNode = FirebaseDatabase.getInstance();
                    reference = rootNode.getReference().child("Users");
                    //Fetch all values
                    String username = name.getText().toString();
                    String value = view.getTag().toString();
                    int rating = Integer.parseInt(value);
                    UserHelper helper = new UserHelper(username,rating);
                    reference.child(username).setValue(helper);
                    Toast.makeText(MainActivity.this, "Feedback submitted successfully!", Toast.LENGTH_SHORT).show();
                    displayScore();
                }
            }
        });

        fiveStar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (name.length() == 0){
                    name.setError("Please enter your full name.");
                }
                else {
                    name.setError(null);
                    rootNode = FirebaseDatabase.getInstance();
                    reference = rootNode.getReference().child("Users");
                    //Fetch all values
                    String username = name.getText().toString();
                    String value = view.getTag().toString();
                    int rating = Integer.parseInt(value);
                    UserHelper helper = new UserHelper(username,rating);
                    reference.child(username).setValue(helper);
                    Toast.makeText(MainActivity.this, "Feedback submitted successfully!", Toast.LENGTH_SHORT).show();
                    displayScore();
                }
            }
        });
    }
}

Score.java -

package com.example.feedback;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.StringRes;
import androidx.appcompat.app.AppCompatActivity;

import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

public class Score extends AppCompatActivity {

    TextView avgScore;
    DatabaseReference dbRef;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE); //will hide the title
        getSupportActionBar().hide(); // hide the title bar
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN); //enable full screen
        setContentView(R.layout.score);
        avgScore = findViewById(R.id.textView2);
        dbRef = FirebaseDatabase.getInstance().getReference().child("Users");

        scoreRealTime();
    }

    public void scoreRealTime() {
        dbRef.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                double total = 0;
                for (DataSnapshot ds : snapshot.getChildren()){
                    double values = Double.parseDouble(ds.child("rating").getValue().toString());
                    total = total + values;
                }
                double average = (double) total / snapshot.getChildrenCount();
                avgScore.setText(String.format("%.2f", average));
            }

            @Override
            public void onCancelled(@NonNull DatabaseError error) {
            }
        });
    }
}

AndroidManifest.xml -

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.feedback">

    <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/AppTheme">
        <activity
            android:name=".MainActivity"
            android:screenOrientation="landscape">
        </activity>
        <activity
            android:name=".Score"
            android:screenOrientation="landscape">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

I'm assuming there is something very simple, wrong with displayScore() but can't seem to figure it out. Thanks in advance.

Answer 1

You have kept Score Activity as launcher activity. So use MainActivity as Launcher activity like this

<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/AppTheme">
    <activity
        android:name=".Score"
        android:screenOrientation="landscape">
    </activity>
    <activity
        android:name=".MainActivity"
        android:screenOrientation="landscape">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

And one more suggestion there is a lot of code duplication you can make a function to upload rating and call it in else block of onClickListner

Answer 2

You have kept the second activity as the launcher activity, that is why android overlooks your MainActivity.java

You should change your Manifest as

<?xml version="1.0" encoding="utf-8"?>

<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/AppTheme">
    <activity
        android:name=".Score"
        android:screenOrientation="landscape">
    </activity>
    <activity
        android:name=".MainActivity"
        android:screenOrientation="landscape">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

and there can be one more improvement in your app, you can add recyclerView instead of 5 buttons, That will make your code shorter.