我已经检查了有关此问题的stackoverflow上的所有问题，并尝试了所有内容并仍然得到相同的错误。我有一个带有firebase身份验证，存储和数据库的android应用程序。我在android studio上创建的每个模拟器上都运行得很好。我也尝试在使用Genymotion创建的设备上运行应用程序，该应用程序也可以正常工作。然后我尝试使用USB调试在真实设备上运行，即使这样应用程序运行正常。
只有当我尝试使用Android工作室“Build Apk”选项创建的APK文件安装应用时，应用才会崩溃。由于应用程序在USB调试和每个模拟器上运行良好，我甚至无法在logcat中看到错误。
这是文件文件。 Mainfest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.kinny.instagram_clone">
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="false"
android:fullBackupContent="false"
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">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.kinny.instagram_clone" />
</intent-filter>
</activity>
<activity
android:name=".UserList"
/>
<activity android:name=".UserFeed"
android:parentActivityName=".UserList"
></activity>
<meta-data
android:name="io.fabric.ApiKey"
android:value="504a079771b5c515a67b9ed577e080347a024bc7" />
</application>
<uses-permission android:name="android.permission.INTERNET" />
</manifest>
我的Activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relativeLayout"
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.example.kinny.instagram_clone.MainActivity">
<ImageView
android:id="@+id/mainPageLogo"
android:layout_width="match_parent"
android:layout_height="250dp"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="6dp"
app:srcCompat="@drawable/logo" />
<EditText
android:id="@+id/email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:ems="10"
android:hint="test@gmail.com"
android:includeFontPadding="false"
android:inputType="textPersonName"
android:paddingTop="20dp" />
<EditText
android:id="@+id/password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="@+id/email"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:layout_marginTop="22dp"
android:ems="10"
android:hint="password"
android:inputType="textPassword"
android:paddingTop="20dp" />
<EditText
android:id="@+id/username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/password"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:layout_marginTop="14dp"
android:ems="10"
android:hint="username"
android:inputType="textPersonName"
android:paddingTop="20dp" />
<Button
android:id="@+id/LoginSignup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:background="@color/colorPrimaryDark"
android:onClick="signupOrLogin"
android:text="Sign Up"
android:textColor="@android:color/holo_red_light"
android:textSize="25dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_above="@+id/changeButtonText"
android:layout_alignParentStart="true" />
<TextView
android:id="@+id/changeButtonText"
android:paddingTop="20dp"
android:layout_width="match_parent"
android:gravity="center"
android:layout_height="wrap_content"
android:text="Log In"
android:textColor="#1d27ff"
android:textSize="30dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="12dp" />
</RelativeLayout>
和我的主要活动文件
class MainActivity extends AppCompatActivity implements View.OnClickListener, View.OnKeyListener {
// Layout elements
EditText password;
EditText email;
TextView changeSingupLoginMode;
Button signupButton;
ImageView logo;
RelativeLayout relativeLayout;
EditText username;
// Fierbase credentials
public static FirebaseUser user;
public static FirebaseDatabase database = FirebaseDatabase.getInstance();
public static DatabaseReference myRef = database.getReference("users");
DatabaseReference users;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
// Util variables
Boolean signupModeActive;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Write a message to the database
signupModeActive = true;
// Firebase Database reference
users = FirebaseDatabase.getInstance().getReference();
// Firebase Authentication
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
user = firebaseAuth.getCurrentUser();
if (user != null) {
// User is signed in
makeToast("Welcome " + user.getEmail());
showUserList();
} else {
// User is signed out
makeToast("Welcome");
}
}
};
email = (EditText) findViewById(R.id.email);
password = (EditText) findViewById(R.id.password);
signupButton = (Button) findViewById(R.id.LoginSignup);
logo = (ImageView) findViewById(R.id.mainPageLogo);
relativeLayout = (RelativeLayout) findViewById(R.id.relativeLayout);
changeSingupLoginMode = (TextView) findViewById(R.id.changeButtonText);
username = (EditText) findViewById(R.id.username);
changeSingupLoginMode.setOnClickListener(this);
logo.setOnKeyListener(this);
relativeLayout.setOnClickListener(this);
email.setOnKeyListener(this);
password.setOnKeyListener(this);
username.setOnClickListener(this);
}
public void showUserList() {
Intent i = new Intent(getApplicationContext(), UserList.class);
startActivity(i);
}
private static boolean isValidEmail(String email) {
return !TextUtils.isEmpty(email) && android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
}
public void createAccount(final String accountEmail, final String accountPassword, final String accountUsername){
mAuth.createUserWithEmailAndPassword(accountEmail, accountPassword)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
// Sign in success, update UI with the signed-in user's information
User newUser = new User(accountEmail, accountPassword, accountUsername);
myRef.push().setValue(newUser);
showUserList();
} else {
// If sign in fails, display a message to the user.
task.getException();
Toast.makeText(getApplicationContext(), task.getException().getLocalizedMessage(),
Toast.LENGTH_SHORT).show();
}
}
});
}
public void signupOrLogin(View view) {
if (TextUtils.isEmpty(String.valueOf(email.getText()))) {
this.makeToast("Please enter an email id!");
return;
}
if (TextUtils.isEmpty(String.valueOf(password.getText()))) {
this.makeToast("Please enter a password");
return;
}
if (!isValidEmail(String.valueOf(email.getText()))) {
this.makeToast("Invalid email address!!");
return;
} else {
if (signupModeActive) {
if (TextUtils.isEmpty(String.valueOf(username.getText()))) {
this.makeToast("Please enter a username");
return;
}
myRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
boolean usernamTaken = false;
boolean emailIdTken = false;
for(DataSnapshot data: dataSnapshot.getChildren()){
if ((data.child("username").getValue()).equals(String.valueOf(username.getText()))) {
usernamTaken = true;
break;
}
}
if(!usernamTaken){
createAccount(String.valueOf(email.getText()), String.valueOf(password.getText()), String.valueOf(username.getText()));
return;
}
else{
makeToast("Username Taken, Try Something else");
return;
}
}
@Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.w("data", "Failed to read value.", error.toException());
}
});
} else {
mAuth.signInWithEmailAndPassword(String.valueOf(email.getText()), String.valueOf(password.getText()))
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Log.d("Login", "LogIn:onComplete:" + task.isSuccessful());
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
Log.w("Login", "signInWithEmail:failed", task.getException());
Toast.makeText(getApplicationContext(), task.getException().getLocalizedMessage(),
Toast.LENGTH_SHORT).show();
} else {
showUserList();
}
}
});
}
}
}
@Override
public void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
@Override
public void onStop() {
super.onStop();
if (mAuthListener != null) {
mAuth.removeAuthStateListener(mAuthListener);
}
}
public void makeToast(String text) {
Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.changeButtonText) {
if (signupModeActive == true) {
signupModeActive = false;
changeSingupLoginMode.setText("Sign Up");
signupButton.setText("Log In");
username.setVisibility(View.INVISIBLE);
} else {
signupModeActive = true;
changeSingupLoginMode.setText("Log In");
signupButton.setText("Sign Up");
username.setVisibility(View.VISIBLE);
}
} else if (v.getId() == R.id.mainPageLogo || v.getId() == R.id.relativeLayout) {
// removing keyboard form the app if clicked somewhere else
InputMethodManager inm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
inm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
}
}
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN) {
signupOrLogin(v);
}
return false;
}
}
请注意，我的应用中还有多项活动，可以查看here。
答案 0 :(得分：0)
1）如果您使用USB插入设备并安装apk并在插入的设备上运行它，您可以在Android Studio 2中的Android Monitor面板中看到logcat）此外，您可以使用Crashlytics（只需将其附加到您的应用程序）即可查看Crashlytics仪表板中的错误。