在 Android 中，如何切换已经在一个片段中的片段以从一个片段移动到另一个片段（Java）？

Question

I have linked a switch to shift from Fragment1 to Fragment2 but I do not know how to return to Fragment1 if the switch is clicked again.

Answer 1

Do not put the switch inside fragment. You should include the switch in parent layout and change the fragment when switch is clicked.

For eg;

You include switch in linear layout below that layout you have framelayout in which you are committing the fragments.

Answer 2

A possible solution: use switch.setOnCheckedChangeListener and transaction.replace . For example:

public class MainActivity extends Activity implements CompoundButton.OnCheckedChangeListener {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    fTrans.add(R.id.your_fragment_container, frag1);

    Switch switch = findViewById(R.id.switch);
    if (switch != null) {
        switch.setOnCheckedChangeListener(this);
    }
    frag1 = new Fragment1();
    frag2 = new Fragment2();
}

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        fTrans = getFragmentManager().beginTransaction();
        if(isChecked){
            fTrans.replace(R.id.your_fragment_container, frag2);
        }else{
            fTrans.replace(R.id.your_fragment_container, frag1);
        }
}

}

R.id.your_fragment_container is a layout for your two fragments