Question

我有一个包含2个按钮的活动 - 登录和注册。这两个都有一个链接的活动（基于片段的选项卡式活动），其中包含登录/注册表单。

现在，点击按钮后，我无法导航到特定标签页。即，如果单击注册按钮，则应打开基于注册片段的选项卡，如果单击登录按钮，则应打开基于登录片段的选项卡。

我如何实现这一目标？

以下是我各自行动的代码。

主页Activity.java -

public class HomeActivity  extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        findViewById(R.id.signup_btn).setOnClickListener(listener_signup_btn);
        findViewById(R.id.signin_btn).setOnClickListener(listener_signin_btn);
    }

    View.OnClickListener listener_signup_btn = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //Intent intent = new Intent(HomeActivity.this, SignupActivity.class);
            //startActivity(intent);
        }
    };

    View.OnClickListener listener_signin_btn = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(HomeActivity.this, HomeTaberActivity.class);
            startActivity(intent);
        }
    };
}

HomeTaberActivity.java -

public class HomeTaberActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener {

    private TabLayout hometabLayout;

    private ViewPager homeviewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hometaber);

        hometabLayout = (TabLayout) findViewById(R.id.hometabLayout);

        hometabLayout.addTab(hometabLayout.newTab().setText("Sign In"));
        hometabLayout.addTab(hometabLayout.newTab().setText("Sign Up"));
        hometabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

        homeviewPager = (ViewPager) findViewById(R.id.homepager);

        HomePager adapter = new HomePager(getSupportFragmentManager(), hometabLayout.getTabCount());

        adapter.Initialise(new LoginActivity(),new SignupActivity());
        adapter.addstring("Sign In"); adapter.addstring("Sign Up");
        homeviewPager.setAdapter(adapter);
        hometabLayout.setupWithViewPager(homeviewPager);
    }

    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        homeviewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {

    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }
}

Answer 1

您可以使用

创建 STATIC 方法。
使用INTENT putExtra/getIntExtra 方法。检查 Vishva Dave's 答案。

第一路

public static ViewPager homeviewPager; //GLOBAL
        public static HomePager adapter; //GLOBAL
        adapter = new HomePager(getSupportFragmentManager(), hometabLayout.getTabCount()); //onCreate section

        public static void _openSIGNIN() // Create this static method
        {
            homeviewPager.setCurrentItem(0);
        }

        public static void _openSIGNUP() // Create this static method
        {
            homeviewPager.setCurrentItem(1);
        }

<强> HomeTaberActivity

        View.OnClickListener listener_signin_btn = new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Intent intent = new Intent(HomeActivity.this, HomeTaberActivity.class);
                    startActivity(intent);
                    _openSIGNIN();
                }
            };

        View.OnClickListener listener_signup_btn = new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                     Intent intent = new Intent(HomeActivity.this, HomeTaberActivity.class);
                    startActivity(intent);
                    _openSIGNUP();
                }
            };

Answer 2

使用intent添加一个值。即登录1和注册2.如果值为1，则检入活动，然后查看当前项目0，如果是2，则查看当前项目1。

Home Activity.java ：

public class HomeActivity  extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        findViewById(R.id.signup_btn).setOnClickListener(listener_signup_btn);
        findViewById(R.id.signin_btn).setOnClickListener(listener_signin_btn);
    }

    View.OnClickListener listener_signup_btn = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(HomeActivity.this, HomeTaberActivity.class);
            intent.putExtra("value", 1);
            startActivity(intent);
        }
    };

    View.OnClickListener listener_signin_btn = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(HomeActivity.this, HomeTaberActivity.class);
            intent.putExtra("value", 2);
            startActivity(intent);
        }
    };
}

HomeTaberActivity.java ：

public class HomeTaberActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener {

    private TabLayout hometabLayout;

    private ViewPager homeviewPager;
    int value;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hometaber);

        hometabLayout = (TabLayout) findViewById(R.id.hometabLayout);

        hometabLayout.addTab(hometabLayout.newTab().setText("Sign In"));
        hometabLayout.addTab(hometabLayout.newTab().setText("Sign Up"));
        hometabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

        homeviewPager = (ViewPager) findViewById(R.id.homepager);

        HomePager adapter = new HomePager(getSupportFragmentManager(), hometabLayout.getTabCount());

        adapter.Initialise(new LoginActivity(),new SignupActivity());
        adapter.addstring("Sign In"); adapter.addstring("Sign Up");
        homeviewPager.setAdapter(adapter);
        hometabLayout.setupWithViewPager(homeviewPager);

           final Intent intent = new Intent(getIntent());
           value = intent.getIntExtra("value", -1);

           if(value == 1) {
                  viewpager.setCurrentItem(0);
              } else {
                  viewpager.setCurrentItem(1);
              }
    }

    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        homeviewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {

    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }
}

如何在按钮单击时打开特定的选项卡式活动？

2 个答案: