一段时间以来，我一直遇到通过/加载我的一个活动（登录屏幕）的问题。启动的第一个活动有两个按钮“登录”和“注册”，两个相同的onClick函数定义。当我选择“注册”时，“注册”活动启动，但是，当我选择“登录”按钮时，没有任何反应（“登录”活动应该启动），应用程序冻结然后我必须手动关闭它因为它崩溃了。
为了在另一个问题上测试它，我在AndroidManifest.xml中将“Login”活动设置为MAIN和LAUNCHER，以查看它是否可以在没有其他活动的任何帮助的情况下首先启动，但是，只有一个空白的白屏来起来，再一次，没有别的事情发生。它曾经在很多场合工作过，我不知道是什么导致这种情况发生。任何帮助将不胜感激！
我的AndroidManifest.xml代码：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.michael.whatsupldn">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:name=".TodayApp"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".OpeningActivity"/>
<activity
android:name="com.facebook.FacebookActivity"
android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
android:label="@string/app_name"
android:theme="@android:style/Theme.Translucent.NoTitleBar" />
<meta-data
android:name="com.facebook.sdk.ApplicationId"
android:value="@string/facebook_application_id" />
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".RegisterActivity"/>
<activity android:name=".MainActivity"/>
<!--
ATTENTION: This was auto-generated to add Google Play services to your project for
App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information.
-->
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings"
android:parentActivityName=".MainActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.michael.whatsupldn.MainActivity" />
</activity>
</manifest>
您可以查看模拟器输出here。
修改
我的LoginActivity的XML代码：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#E0E0E0"
tools:context="com.example.michael.whatsupldn.LoginActivity">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="@drawable/darkest_london_city_blur"
android:layout_alignParentTop="true"
android:id="@+id/imageView"
android:contentDescription="@string/city_of_london" />
<LinearLayout
android:id="@+id/db1_root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtWelcome"
android:text="@string/welcome"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingTop="50dp"
android:textColor="#FAFAFA"
android:textSize="55sp"/>
<TextView
android:id="@+id/txtSignInBelow"
android:text="@string/please_sign_in_below"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_marginTop="8dp"
android:textColor="#FAFAFA"
android:gravity="center" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical"
android:weightSum="1">
<EditText
android:id="@+id/editTextEmail"
android:hint="@string/email"
android:background="@drawable/shape"
android:layout_width="match_parent"
android:layout_height="50dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:layout_marginTop="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginBottom="8dp"
android:inputType="textEmailAddress"
android:textColor="#FAFAFA"
android:textColorHint="#FAFAFA" />
<EditText
android:id="@+id/editTextPassword"
android:hint="@string/password"
android:background="@drawable/shape"
android:layout_width="match_parent"
android:layout_height="50dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:layout_marginTop="8dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginBottom="16dp"
android:textColor="#FAFAFA"
android:textColorHint="#FAFAFA"/>
<!-- android:inputType="textPassword"-->
<Button
android:id="@+id/signinButton"
android:text="@string/sign_in"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:textAllCaps="false"
android:background="@drawable/shape_button"
android:textSize="16sp"
android:onClick="signinButton_onClick"/>
<TextView
android:id="@+id/Or"
android:text="@string/or"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:textColor="#FAFAFA"
android:layout_margin="8dp"
android:textAllCaps="false"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<com.facebook.login.widget.LoginButton
android:id="@+id/facebookButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingTop="12dp"
android:paddingBottom="12dp"
android:layout_weight="1"
android:layout_marginStart="16dp"
android:layout_marginEnd="4dp"/>
<com.google.android.gms.common.SignInButton
android:id="@+id/googleButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:layout_marginStart="4dp"
android:layout_marginEnd="16dp"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
您可以查看我的LoginActivity here。
我的登录Java代码：
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.GoogleAuthProvider;
import java.util.Arrays;
public class LoginActivity extends AppCompatActivity {
private LoginButton facebookButton;
private CallbackManager callbackManager;
private SignInButton mGoogleButton;
private static final int RC_SIGN_IN = 1;
private GoogleApiClient mGoogleApiClient;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private static final String TAG = "LOGIN_ACTIVITY";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if (firebaseAuth.getCurrentUser() != null ) {
startActivity(new Intent(LoginActivity.this, MainActivity.class));
}
}
};
mGoogleButton = (SignInButton) findViewById(R.id.googleButton);
// Configure Google Sign In
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
mGoogleApiClient = new GoogleApiClient.Builder(getApplicationContext())
.enableAutoManage(this, new GoogleApiClient.OnConnectionFailedListener() {
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Toast.makeText(LoginActivity.this, "You have an error", Toast.LENGTH_LONG).show();
}
})
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
mGoogleButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
signIn();
}
});
callbackManager = CallbackManager.Factory.create();
facebookButton = (LoginButton) findViewById(R.id.facebookButton);
facebookButton.setReadPermissions(Arrays.asList("email"));
facebookButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
goMainScreen();
}
@Override
public void onCancel() {
Toast.makeText(getApplicationContext(), R.string.com_facebook_loginview_cancel_action, Toast.LENGTH_SHORT).show();
}
@Override
public void onError(FacebookException error) {
Toast.makeText(getApplicationContext(), R.string.com_facebook_internet_permission_error_message, Toast.LENGTH_SHORT).show();
}
});
}
@Override
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
if (result.isSuccess()) {
// Google Sign In was successful, authenticate with Firebase
GoogleSignInAccount account = result.getSignInAccount();
firebaseAuthWithGoogle(account);
} else {
// Google Sign In failed, update UI appropriately
// ...
}
}
}
private void firebaseAuthWithGoogle(GoogleSignInAccount account) {
AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(), null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Log.d(TAG, "signInWithCredential: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(TAG, "signInWithCredential", task.getException());
Toast.makeText(LoginActivity.this, "Authentication failed.",
Toast.LENGTH_SHORT).show();
}
// ...
}
});
}
private void signIn() {
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);
}
private void goMainScreen() {
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
public void signinButton_onClick(View view) {
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
}
}
答案 0 :(得分：1)
将Tumbler元素放在Activity标记内。不在它之外：
我的AndroidManifest.xml代码：
</Application>虽然添加了您的LoginActivity代码。