java - 从Activity设置片段EditeText的文本

Question

如何从活动中设置片段的 EditText 的文本？

这是活动代码：

public class MainActivity extends AppCompatActivity 
{
    FrameLayout simpleFrameLayout;
    TabLayout tabLayout;
    EditText editText;
    
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        simpleFrameLayout = (FrameLayout) findViewById(R.id.simpleFrameLayout);
        tabLayout = (TabLayout) findViewById(R.id.simpleTabLayout);
// Create a new Tab named "First"
        TabLayout.Tab firstTab = tabLayout.newTab();
        firstTab.setText("Personal"); // set the Text for the first Tab
        tabLayout.addTab(firstTab); // add  the tab at in the TabLayout
// Create a new Tab named "Second"
        TabLayout.Tab secondTab = tabLayout.newTab();
        secondTab.setText("Chat"); // set the Text for the second Tab
        tabLayout.addTab(secondTab); // add  the tab  in the TabLayout
        
        
        
        try {
            Fragment fragment = null;
            fragment = new FirstFragment();
            FragmentManager fm = getSupportFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();
            ft.replace(R.id.simpleFrameLayout, fragment);
            ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
            ft.commit();
        }
        catch (Exception e) {

        }
        
        tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
                @Override
                public void onTabSelected(TabLayout.Tab tab) {
// get the current selected tab's position and replace the fragment accordingly
                    try {
                        Fragment fragment = null;
                    switch (tab.getPosition()) {
                        case 0:
                            fragment = new FirstFragment();
                            break;
                        case 1:
                            fragment = new SecondFragment();
                            break;
                    }
                        FragmentManager fm = getSupportFragmentManager();
                        FragmentTransaction ft = fm.beginTransaction();
                    ft.replace(R.id.simpleFrameLayout, fragment);
                    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                        ft.commit();
                    }
                    catch (Exception e) {
                        
                    }
                }

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

                }

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

                }
            });
        
    }
    
    public void connect(){
        //set text of EditText of SecondFragment
    }
}

我正在寻找解决此问题的方法：我想创建一个聊天客户端，为此我需要不时更新选项卡的 EditText 而无需切换到该选项卡。我还需要在切换选项卡时不会丢失该 EditText 的内容。

标签： javaandroidandroid-fragmentactivityandroid-tablayout

Answer 1

只需在主要活动中创建一个变量，您可以从片段中更新该变量。由于活动的生命周期不会从一个片段更改到另一个片段，因此您可以从第二个片段获得相同的值。

我希望这有帮助。