Question

你真的很挣这个，所以我在寻找没有运气的解决方案一天后的第一篇文章。

我有一个启动画面，其中有一个带有onClickListener的ImageView，点击它时打开了我的MainActivity就好了：

SplashActivity.java

      bookMain.setOnClickListener(new View.OnClickListener() {

       @Override
        public void onClick(View view) {
            Intent intent = new Intent(SplashActivity.this, MainActivity.class);
            startActivity(intent);
            }

然而，我想要实现的是，当单击按钮时，它会打开我的MainActivity，但是将MainActivity中的fragment_container替换为另一个片段（这是我的底栏导航的工作原理）。

这是MainActivity中的代码，用于在单击导航按钮时处理片段的替换，基本上我希望Splash Screen的点击打开“BookFragment”而不是直接进入“RoomsFragment”：

MainActivity.java

public class MainActivity extends AppCompatActivity {

    //STANDARD ON CREATE OPEN TO LOAD INITIAL LAYOUT
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


//THIS CREATES A BLANK CONTAINER FOR EACH FRAGMENT YOU CREATE TO GO IN
    if (findViewById(R.id.fragment_container) != null) {
        // However, if we're being restored from a previous state,
        // then we don't need to do anything and should return or else
        // we could end up with overlapping fragments.
        if (savedInstanceState != null) {
            return;
        }
        // Create a new Fragment to be placed in the activity layout
        RoomsFragment firstFragment = new RoomsFragment();
        // Add the fragment to the 'fragment_container' FrameLayout
        getSupportFragmentManager().beginTransaction()
                .add(R.id.fragment_container, firstFragment).commit();


//THIS CREATES THE NAV BAR AND TELLS WHAT FRAGMENT TO PUT IN THE CONTAINER WHEN A TAB IS SELECTED
        BottomBar bottomBar = (BottomBar) findViewById(R.id.bottomBar);
        bottomBar.setOnTabSelectListener(new OnTabSelectListener() {
            @Override
            public void onTabSelected(@IdRes int tabId) {
                FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

                //TAB1 - THE DEFAULT TAB
                if (tabId == R.id.tab_rooms) {

                    RoomsFragment newFragment = new RoomsFragment();
                    transaction.replace(R.id.fragment_container, newFragment);
                    transaction.addToBackStack(null);
                    transaction.commit();

                    //TAB2
                } else if (tabId == R.id.tab_shisha) {

                    // THIS BIT BELOW IS WHAT CHANGES THE FRAGMENT IN THE CONTAINER
                    ShishaFragment newFragment = new ShishaFragment();
                    transaction.replace(R.id.fragment_container, newFragment);
                    transaction.addToBackStack(null);
                    transaction.commit();

                    //TAB3
                } else if (tabId == R.id.tab_cocktails) {

                    // THIS BIT BELOW IS WHAT CHANGES THE FRAGMENT IN THE CONTAINER
                    CocktailsFragment newFragment = new CocktailsFragment();
                    transaction.replace(R.id.fragment_container, newFragment);
                    transaction.addToBackStack(null);
                    transaction.commit();

                    //TAB4
                } else if (tabId == R.id.tab_food) {

                    // THIS BIT BELOW IS WHAT CHANGES THE FRAGMENT IN THE CONTAINER
                    FoodFragment newFragment = new FoodFragment();
                    transaction.replace(R.id.fragment_container, newFragment);
                    transaction.addToBackStack(null);
                    transaction.commit();

                    //TAB5
                } else if (tabId == R.id.tab_book) {

                    // THIS BIT BELOW IS WHAT CHANGES THE FRAGMENT IN THE CONTAINER
                    BookFragment newFragment = new BookFragment();
                    transaction.replace(R.id.fragment_container, newFragment);
                    transaction.addToBackStack(null);
                    transaction.commit();
                }


            }


        });

更正了工作SplashActivity.java：

在onCreate方法中：

//ONCLICK LISTENER FOR THE ENTER BUTTON AND BOOK BUTTON ON SPLASH PAGE


    Button enterButton = (Button) findViewById(R.id.enter_button);
    enterButton.setOnClickListener(SplashActivity.this);

    Button bookButton = (Button) findViewById(R.id.book_button);
    bookButton.setOnClickListener(SplashActivity.this);

}

public void onClick(View v) {
    Intent intent = new Intent(SplashActivity.this, MainActivity.class);
    switch (v.getId()) {
        case R.id.enter_button:

            startActivity(intent);
            break;
        case R.id.book_button:

            intent.putExtra("source","onClick");
            startActivity(intent);
            break;
        default:
            break;
    }
}

更正了工作MainActivity.java

在onCreate方法中（输入与您相关的bottomBar选项卡的位置）：

        Intent intent = getIntent();
        String source = intent.getStringExtra("source");
        if (source != null && source.equals("onClick")) {
            bottomBar.selectTabAtPosition(4);
        }

祝你好运！

Answer 1

因为你使用了这个：

getSupportFragmentManager().beginTransaction()
            .add(R.id.fragment_container, firstFragment).commit();

它会显示firstFragment默认

你可以试试这个：

在Spalsh活动中

Intent intent = new Intent(SplashActivity.this, MainActivity.class);
startActivity(intent);

为意图添加一些参数

Intent intent = new Intent(SplashActivity.this, MainActivity.class);
intent.putExtra("source","onClick");   //add like this line
startActivity(intent);

主要活动

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

    ```your code

    Intent intent = getIntent();
    String source = intent.getStringExtra("source");
    if (source.equals("onClick")) {
        bottomBar.onTabSelected(R.id.tab_book);
    }
}

当主要活动接受参数source并且source值是您的设置时，它将运行if中的代码

SplashScreen活动onClick打开MainActivity并替换该Activity的片段容器中的片段

SplashActivity.java

MainActivity.java

更正了工作SplashActivity.java：

更正了工作MainActivity.java

1 个答案: