Question

我有一个活动扩展到FragmentActivity，它有4个片段。我现在想要在按钮点击时打开fragment2，它存在于fragment1中。简而言之，我想在按钮点击时从fragment1切换到片段2。我的代码是：公共类SampleActivity扩展了FragmentActivity {

static ViewPager mViewPager;
PagingAdapter TabAdapter;

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

    TabAdapter = new PagingAdapter(getSupportFragmentManager(), this);

    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(TabAdapter);
}
public class PagingAdapter extends FragmentPagerAdapter {

    private Context context;
    public PagingAdapter(FragmentManager fm, Context context) {
        super(fm);
        this.context = context;
    }

    @Override
    public Fragment getItem(int i) {
        switch(i){
        case 0:         
            return new Fragment1();
        case 1:
            return new Fragment2();
        case 2:
            return new Fragment3();
        case 3:
            return new Fragment4();
        }
        return null;
    }

    @Override
    public int getCount() {
        return 4;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch(position){
        case 0:
            return context.getString(R.string.page_tab_1);
        case 1:
            return context.getString(R.string.page_tab_2);
        case 2:
            return context.getString(R.string.page_tab_3);
        case 3:
            return context.getString(R.string.page_tab_4);
        }
        return "Fragment " + (position + 1);
    }
}

public class Fragment1 extends Fragment{
    Button btn_close = (Button) mydeals.findViewById(R.id.btn_close);
btn_all.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
    //Needs to open fragment2 here. 
});
}

我尝试使用id进行转换，但是下面的代码

打开了fragment4

ViewPager viewpager = DealsActivity.mViewPager;  
viewpager.setCurrentItem(getId());

Answer 1

在Fragment1版面中，在android:onClick="buttonClickMethod"定义中添加属性Button。然后在您的活动中，添加以下方法：

public void buttonClickMethod(View v) {
    // some code to execute after button click
    // ....
    // You can open fragment 2 here, like this :
    FragmentManager fm = getSupportFragmentManager();
    FragmentTransaction ft = fm.beginTransaction();
    ft.replace(R.id.LAYOUT_ID_FOR_FRAGMENT2, FRAGMENT2);
    ft.commit();
}

请注意，该方法的名称与android:onClick属性中定义的名称相同。

从android中的片段打开片段

1 个答案: