android - 媒体播放器在未导入、未初始化或没有任何代码的活动中工作

Question

我在我的应用程序的一些活动和片段中使用媒体播放器。一切正常，没有问题。导入、启动、停止、发布。

问题

我的家庭活动根本不使用 MediaPlayer。不导入或任何代码相关。当我启动应用程序时，音乐播放。关闭应用程序 (onDestroy()) 音乐停止。再次启动活动音乐开始。onStop() 继续播放。主页活动是MainActivity，第一个launching。这怎么可能？即使当我启动第一个应用程序活动（HomeActivity）时仍然存在其他活动（没有停止，没有释放或其他东西）也不应该播放任何东西。

澄清

无需代码，因为它与媒体播放器没有任何关系。

编辑

按照要求，我发布活动以防万一：

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
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;
import com.squareup.picasso.Picasso;
import java.text.SimpleDateFormat;
import java.util.Date;
import eu.healthydev.triviaarena.Interface.RankingCallBack;
import eu.healthydev.triviaarena.Intro.PrefManager;
import eu.healthydev.triviaarena.Model.QuestionScore;
import eu.healthydev.triviaarena.Model.Ranking;
import eu.healthydev.triviaarena.Model.User;

public class UserProfile extends AppCompatActivity {

    private FirebaseAuth firebaseAuth;
    private FirebaseDatabase database;
    private ImageView userAvatar;
    private TextView userName;
    private TextView userScore;
    private TextView PvPScore;
    private TextView PvPWins;
    private TextView userClass, userGender, dateofJoin;
    private Button btnEnterDungeons;
    private String imageURL, user_class;
    long totalScore;
    private static String TAG = "";
    DatabaseReference questionScore, rankingTbl;
    int sum = 0;
    GoogleApiClient mGoogleApiClient;
    PrefManager prefManager;  




    @Override
    protected void onStart() {
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();
        mGoogleApiClient.connect();
        super.onStart();

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user_profile);

        firebaseAuth = FirebaseAuth.getInstance().getInstance();
        database = FirebaseDatabase.getInstance();
        questionScore = database.getReference("Question_Score");
        rankingTbl = database.getReference("Ranking");
        prefManager = new PrefManager(this);

        //Checking whether a user as already Logged In
        if (firebaseAuth.getCurrentUser() == null) {
            finish();
            //Starting the User Login Activity if the user is not Logged in
            startActivity(new Intent(this, MainActivity.class));
        }
        final FirebaseUser user = firebaseAuth.getCurrentUser();

        userAvatar = findViewById(R.id.userAvatar);
        userName = findViewById(R.id.nickName);
        btnEnterDungeons = findViewById(R.id.enterGame);
        userClass = findViewById(R.id.userClass);
        userGender = findViewById(R.id.user_genderA);
        userScore = findViewById(R.id.userScore);
        PvPWins = findViewById(R.id.pvpWins);
        PvPScore = findViewById(R.id.pvpScore);
        dateofJoin = findViewById(R.id.dateJoined);
        Toolbar toolbar = findViewById(R.id.toolbar);
        toolbar.setTitle("");
        toolbar.setSubtitle("");
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowTitleEnabled(false);




        btnEnterDungeons.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(UserProfile.this, GameChooseActivity.class);
                prefManager.setFirstTimeLaunch(false);
                startActivity(intent);
                finish();
            }
        });

        getData();

        updateScore(firebaseAuth.getCurrentUser().getDisplayName(), new RankingCallBack<Ranking>() {
            @Override
            public void callBack(Ranking ranking) {
                //Update to Ranking table
                rankingTbl.child(ranking.getUserName())
                        .setValue(ranking);
                rankingTbl.child(ranking.getUserName()).child("avatar").setValue(imageURL);
                rankingTbl.child(ranking.getUserName()).child("user_class").setValue(user_class);
                //showRanking(); //After upload we will short ranking table and show result

            }
        });

        getScore();

    }


    //Method to get data from Firebase user and show them in profile
    private void getData() {
        final Context mContext = UserProfile.this;
        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
        String userid = user.getUid();
        final long joinedDate = user.getMetadata().getCreationTimestamp();
        final SimpleDateFormat sdf = new SimpleDateFormat("MMM dd,yyyy HH:mm");
        final Date resultdate = new Date(joinedDate);
        DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Users");
        reference.child(userid).addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                User user = dataSnapshot.getValue(User.class);
                userName.setText(user.getUserName());
                userClass.setText(user.getUser_class());
                imageURL = user.getAvatar();
                Picasso.with(mContext).load(imageURL).into(userAvatar);
                dateofJoin.setText((sdf.format(resultdate)));
                PvPWins.setText(String.valueOf(user.getPvP_Wins()));
                PvPScore.setText(String.valueOf(user.getPvP_scores()));
                userScore.setText(String.valueOf(totalScore));
                userGender.setText(user.getUser_gender());


            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
            }
        });
    }

    //Method to get the userScore from Ranking table in firebase
    public void getScore() {
        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
        String name = user.getDisplayName();
        DatabaseReference rankingScore;
        rankingScore = database.getReference("Ranking");

        rankingScore.orderByChild("userName").equalTo(name)
                .addListenerForSingleValueEvent(new ValueEventListener() {
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                        for (DataSnapshot data : dataSnapshot.getChildren()) {
                            Ranking ranking = data.getValue(Ranking.class);
                            totalScore = ranking.getScore();
                        }


                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });
    }

    private void updateScore(final String userName, final RankingCallBack<Ranking> callback) {
        questionScore.orderByChild("user").equalTo(userName)
                .addListenerForSingleValueEvent(new ValueEventListener() {
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                        for (DataSnapshot data : dataSnapshot.getChildren()) {
                            QuestionScore ques = data.getValue(QuestionScore.class);
                            sum += Integer.parseInt(ques.getScore());
                        }
                        //After summary all score, we need process sum variable here because firebase is async DB
                        Ranking ranking = new Ranking(userName, sum, imageURL, user_class);
                        callback.callBack(ranking);
                    }
                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.about_game:
                Intent intent = new Intent(this, AboutGameActivity.class);
                startActivity(intent);
                return (true);

            case R.id.about_us:
                Intent intentus = new Intent(this, AboutUsActivity.class);
                startActivity(intentus);
                return (true);

            case R.id.switch_user:
                FirebaseAuth.getInstance().signOut();
                googleLogout();
                Intent switchuser = new Intent(this, MainActivity.class);
                startActivity(switchuser);
                finish();
                return (true);

            case R.id.logout:
                FirebaseAuth.getInstance().signOut();
                Intent logout = new Intent(this, MainActivity.class);
                startActivity(logout);
                finish();
                return (true);
        }
        return (super.onOptionsItemSelected(item));
    }

    public void googleLogout() {
        Auth.GoogleSignInApi.signOut(mGoogleApiClient).setResultCallback(
                new ResultCallback<Status>() {
                    @Override
                    public void onResult(Status status) {

                    }
                });
    }



    }

正如我所说的与 mediaPlayer 无关。所以完全退出应用程序，点击应用程序图标，这是第一个活动，播放音乐......我无法想象这是怎么可能的。可能会从其他地方获取音乐......但是如何？

标签： androidandroid-mediaplayer