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[英]Android back button is taking me back to the same view but the class seems to have change
[英]how to set a view that when a user click phone's back button, it back to the view in same java class
當用戶單擊電話的后退按鈕(而不是界面中的按鈕)時,我需要弄清楚如何使界面返回上一頁。
在使用我的問題是setContentView()
在我的代碼,當我點擊“back'button,接口不回mainlayout.xml
,但它回到以前的布局文件之前mainlayout.xml
。
有誰知道如何解決這個問題?
public class Main extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainlayout);
}
public void clicked(View v){
switch (v.getId()){
case R.id.a:
setContentView(R.layout.alayout);
break;
case R.id.b:
setContentView(R.layout.blayout);
break;
}
}
}
它將解決問題,但高度推薦 。
public class Main extends AppCompatActivity {
boolean isMainContentSet = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainlayout);
}
public void clicked(View v){
switch (v.getId()){
case R.id.a:
setContentView(R.layout.alayout);
isMainContentSet = false;
break;
case R.id.b:
setContentView(R.layout.blayout);
isMainContentSet = false;
break;
}
}
@Override
public void onBackPressed() {
//your code when back button pressed
if(!isMainContentSet){
setContentView(R.layout.mainlayout);
isMainContentSet = true;
}else{
super.onBackPressed();
}
}
}
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