android底部导航栏如何实现页面跳转功能

++) {
printf("\t%d", students[i].scores[j]);
}
printf("\t%d\t%.2f\n", students[i].totalScore, students[i].averageScore);

for(int j = 0; j < subjectCount; j++) {
printfAndroid底部导航栏可以使用TabLayout和ViewPager组合实现页面跳转功能。

首先，在布局文件中定义("请输入%s成绩：", subjects[j]);
scanf("%d", &students[i].scores[j]);
students[i].totalScore += students[i].scores[j];
}

students[i].averageScore = (float)students[i].totalScore / subjectCount;

TabLayout和ViewPager：

<androidx.coordinatorlayout.widget.CoordinatorLayout 
    android:layout_width="match_parent"
               printf("学生成绩已成功修改！\n");

            break;
        }
    }

    if(!found) {
        printf android:layout_height="match_parent">

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewPager"
        android("学号不存在！\n");
    }
}

// 删除学生成绩
void deleteStudent() {
    if(studentCount == 0:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior) {
        printf("没有学生信息！\n");
        return;
    }

    char id[MAX_ID_LEN];
    int found = 0;

    printf("请输入学号：");
    scanf("%s", id);

    for(int i = 0; i < student"/>

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
Count; i++) {
        if(strcmp(students[i].id, id) == 0) {
            found = 1;

            for        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        app:tabIndicatorColor="@color/colorAccent(int j = i; j < studentCount - 1; j++) {
                students[j] = students[j + 1];
            }

"
        app:tabSelectedTextColor="@color/colorAccent"
        app:tabTextColor="@android:color/white"/>
</androidx.coordinator            studentCount--;

            printf("学生成绩已成功删除！\n");

            break;
        }
    }

    if(!foundlayout.widget.CoordinatorLayout>

然后，创建Fragment并创建FragmentPagerAdapter，将FragmentPagerAdapter设置到ViewPager中：

        printf("学号不存在！\n");
    }
}

// 统计学生成绩
void calculateStats() {
    if
public class MyPagerAdapter extends FragmentPagerAdapter {
    private List<Fragment> fragments;

    public MyPagerAdapter(@NonNull FragmentManager fm, List(studentCount == 0) {
        printf("没有学生信息！\n");
        return;
    }

    float averageScores[MAX_SUBJECTS] = {0};
    float totalAverageScore = 0;

    printf("科目名称\t平均分\n");

   <Fragment> fragments) {
        super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
        this.fragments = fragments;
    }

    @ for(int i = 0; i < subjectCount; i++) {
        for(int j = 0; j < studentCount; jNonNull
    @Override
    public Fragment getItem(int position) {
        return fragments.get(position);
    }

    @Override
    public int++) {
            averageScores[i] += students[j].scores[i];
        }
        averageScores[i] /= studentCount;

        printf("% getCount() {
        return fragments.size();
    }
}

public class MainActivity extends AppCompatActivity {
    private ViewPager viewPager;
    private TabLayout tabLayouts\t\t%.2f\n", subjects[i], averageScores[i]);
    }

    for(int i = 0; i < studentCount; i++) {
        totalAverageScore += students[i].averageScore;
    }
    totalAverageScore /= studentCount;

    printf(";

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

        viewPager =总平均分：%.2f\n", totalAverageScore);
}

// 保存学生成绩到文件
void saveToFile() {
    if(studentCount == 0) {
        printf("没有学生信息！\n");
        return;
    }

    FILE *fp findViewById(R.id.viewPager);
        tabLayout = findViewById(R.id.tabLayout);

        List<Fragment> fragments = new ArrayList<>();
        fragments;
    char filename[MAX_NAME_LEN];

    printf("请输入文件名：");
    scanf("%s", filename);

    fp = fopen(filename.add(new FragmentA());
        fragments.add(new FragmentB());
        fragments.add(new FragmentC());

        viewPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager(),, "w");

    fprintf(fp, "学号\t姓名");
    for(int i = 0; i < subjectCount; i++) fragments));
        tabLayout.setupWithViewPager(viewPager);
    }
}

最后，在Fragment中实现具体的页面功能。