[英]How to add/remove Fragment on Button click?
At present I have got a "RELATIVE_LAYOUT" container which I am using for adding my fragment. 目前我有一个“RELATIVE_LAYOUT”容器,我用它来添加我的片段。 I am using OnClickListener on a button to load the fragment XML layout into the RelativeLayout container. 我在按钮上使用OnClickListener将片段XML布局加载到RelativeLayout容器中。
What I want to achieve is that when I press the button once, the fragment should load...and when I press it again the fragment should be removed. 我想要实现的是,当我按下按钮一次时,片段应该加载......当我再次按下它时,片段应该被删除。 I've already tried using integer to identify if fragment is loaded, but failed. 我已经尝试使用整数来识别是否加载了片段,但是失败了。 Any help Appreciated... 任何帮助赞赏......
CODE: 码:
public class MainActivity extends Activity {
Button B1,B2;
int boolb1=0, boolb2=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
B1 = (Button)findViewById(R.id.btn1);
B2 = (Button)findViewById(R.id.btn2);
B1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
FragmentOne f1 = new FragmentOne();
if(boolb1==0)
{ft.add(R.id.frg1, f1);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
boolb1=1;}
else
{ft.remove(f1);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE);
boolb1=0;}
//ft.addToBackStack("f1");
ft.commit();
}
});
B2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
FragmentTwo f2 = new FragmentTwo();
if(boolb2==0) {
ft.add(R.id.frg2, f2);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
boolb2=1;
} else {
ft.remove(f2);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE);
boolb2=0;
}
//ft.addToBackStack("f2");
ft.commit();
}
});
}
Your issue is that you create a new Fragment
everytime you click the Button
. 您的问题是每次单击Button
都会创建一个新的 Fragment
。 You need to get a reference to the currently added Fragment
and then remove that one. 您需要获取对当前添加的 Fragment
的引用 ,然后删除该Fragment
。
Furthermore, you no longer need to use the flag. 此外,您不再需要使用该标志。 When adding the Fragment
, you can tag it. 添加Fragment
,您可以标记它。 Upon removing the Fragment
, you can use the tag used for adding the Fragment
to get a reference to the currently added Fragment
. 删除Fragment
,您可以使用用于添加Fragment
的标记来获取对当前添加的Fragment
的引用。
Here is an example of how you should do it: 以下是您应该如何执行此操作的示例:
private Button B1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
B1 = (Button)findViewById(R.id.btn1);
B1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
FragmentOne f = (FragmentOne) fm.findFragmentByTag("tag");
if(f == null) { // not added
f = new FragmentOne();
ft.add(R.id.frg1, f, "tag");
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
} else { // already added
ft.remove(f);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE);
}
ft.commit();
}
});
// and so on ...
}
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