按钮单击

Question

我正在制作一个小应用程序，它使用多个屏幕，所有屏幕都使用＆＃34; android：onClick =＆＃34;的声明链接在一起在XML中和Java源代码中的intent语句。所有这些都与登录屏幕中的一个完全不同。每当我按下“继续”按钮时，它所做的就是调出相同的活动，就像它自己刷新一样。

我已经尝试了所有内容，这让我怀疑Facebook按钮功能代码是否与它有关...？

登录活动XML代码中的按钮：

<Button
        android:id="@+id/loginOptionButton"
        android:text="Continue"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:textAllCaps="false"
        android:background="@drawable/shape_rounded_button"
        android:textSize="16sp"
        android:textColor="#424242"
        android:onClick="loginButton_onClick"/>

登录屏幕Java类：

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
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 java.util.Arrays;

public class LoginActivity extends AppCompatActivity {

    private LoginButton loginButton;
    private CallbackManager callbackManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.activity_login);

        callbackManager = CallbackManager.Factory.create();

        loginButton = (LoginButton) findViewById(R.id.facebookButton);

        loginButton.setReadPermissions(Arrays.asList("email"));

        loginButton.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_LONG).show();
            }

            @Override
            public void onError(FacebookException error) {
                Toast.makeText(getApplicationContext(), R.string.com_facebook_internet_permission_error_message, Toast.LENGTH_SHORT). show();
            }
        });
    }

    private void goMainScreen() {
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        callbackManager.onActivityResult(requestCode, resultCode, data);
    }

    public void loginButton_onClick(View view) {
        Intent intent = new Intent(LoginActivity.this, MainActivity.class);
        startActivity(intent);
        }
    }

MainActivity Java类：

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

import com.facebook.AccessToken;
import com.facebook.login.LoginManager;

public class MainActivity extends AppCompatActivity {

    private DrawerLayout mDrawerLayout;
    private ActionBarDrawerToggle mToggle;

    private Toolbar mToolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.activity_main);

        mToolbar = (Toolbar) findViewById(R.id.nav_toolbar);
        setSupportActionBar(mToolbar);

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
        mToggle = new ActionBarDrawerToggle (this, mDrawerLayout, R.string.open, R.string.close);

        mDrawerLayout.addDrawerListener(mToggle);
        mToggle.syncState();

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);


        if (AccessToken.getCurrentAccessToken() == null) {
            goLoginScreen();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if(mToggle.onOptionsItemSelected(item)){
            return true ;
        }

        return super.onOptionsItemSelected(item);
    }

    private void goLoginScreen() {
        Intent intent = new Intent(this, LoginActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
    }

    public void logout(View view) {
        LoginManager.getInstance().logOut();
        goLoginScreen();
    }
}

非常感谢任何帮助！

Answer 1

我必须回答，因为我不幸发表评论。

这是空的吗？

if (AccessToken.getCurrentAccessToken() == null) {
        goLoginScreen();
    }

如果是这样，它会把你送回登录界面。