java [Fragment片段] #Android #UI

Posted 2021-05-07

//在Fragment获取控件ID
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v =  inflater.inflate(R.layout.activity_main2, container, false);
        Button button = v.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener()
        {
          
            @Override
            public void onClick(View v) {
                new AlertDialog.Builder(v.getContext())
                        .setIcon(R.drawable.ic_launcher_background)
                        .setTitle("提示")
                        .setMessage("button")
                        .setNeutralButton("确定", null)
                        .create()
                        .show();
            }
        });
        return v;
    }

public class MainActivity extends AppCompatActivity {
    //声明两个管理器
    private FragmentManager fragmentManager;
    private FragmentTransaction fragmentTransaction;
    //new个Fragment类
    private Query fragment1 = new Query();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //获取两个管理器
        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        //把new的Fragment加入到容器里
        fragmentTransaction.add(R.id.frameLayout, fragment1);
        //fragmentTransaction.add(R.id.frameLayout, fragment2);
        //隐藏某个Fragment
        //fragmentTransaction.hide(fragment2);
        fragmentTransaction.commit();
    }
    
    Button button = findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //获取Fragment
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            //显示某个Fragment
            fragmentTransaction.show(fragment1);
            //隐藏某个Fragment
            fragmentTransaction.hide(fragment2);
            fragmentTransaction.commit();
            
            //有bug，replace后所有的界面都没有了
            ////重新加载某个界面.replace
            // fragmentTransaction.replace(R.id.frameLayout, fragment_query);
            // fragmentTransaction.hide(fragment_add);
            // fragmentTransaction.show(fragment_query);
            // fragmentTransaction.commit();
        }
    });
}