[英]Actionbarsherlock back button and smartphone back button
The problem: 问题:
I have the main activity that I want to callback when I press back button from either smartphone and actionbar on the second activity. 当我在第二个活动中从智能手机和操作栏上按“后退”按钮时,我有要回调的主要活动。 But it always crash, it just work when I put a finish();
但是它总是崩溃,当我输入finish()时它才起作用。 in the main activity, but If I do that then the back button from smartphone doesn't work properly.
在主要活动中,但是如果执行此操作,则智能手机的后退按钮将无法正常工作。
MainActivity: 主要活动:
public class Principal extends SherlockActivity {
public static int THEME = R.style.Theme_Sherlock;
private Button entrar;
private Button cadastrar;
@Override
protected void onCreate(Bundle savedInstanceState) {
//setTheme(Principal.THEME); //Used for theme switching in samples
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
entrar = (Button)findViewById(R.id.entrar);
entrar.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
startActivity(new Intent(Principal.this,LoginActivity.class));
finish();
}
});
cadastrar = (Button)findViewById(R.id.cadastrar_home);
cadastrar.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
Intent intent = new Intent(Principal.this, RegisterActivity.class);
startActivity(intent);
//finish();
}
});
}
SecondActicity: SecondActicity:
public class RegisterActivity extends SherlockActivity{
protected void onCreate(Bundle savedInstanceState) {
setTheme(Principal.THEME); //Used for theme switching in samples
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId())
{
case android.R.id.home:
// Do whatever you want, e.g. finish()
Intent intent = new Intent(this, Principal.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
break;
}
return true;
}
}
Already tried many ways and none works, only with finish(); 已经尝试了许多方法,但仅使用finish()无效。
In your Second Activity just remove your intent and startActivity stuff. 在您的第二个活动中,只需删除您的intent和startActivity内容即可。 Only need:
只需要:
case android.R.id.home:
finish();
break;
finish() will remove that activity from the back-stack so don't use it when starting a new activity that you want the user to get back to by pressing the back button. finish()将从后堆栈中删除该活动,因此在开始要让用户通过按“后退”按钮返回的新活动时,不要使用该活动。
You do not want to relaunch you Principal activity from SecondActivity
, you just want the second activity to finish and return to the previous activity. 您不想从
SecondActivity
重新启动Principal活动,而只希望第二个活动完成并返回上一个活动。 Try replacing the following code in SecondActivity
-- 尝试在
SecondActivity
替换以下代码-
Intent intent = new Intent(this, Principal.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
with just finish()
. 仅带有
finish()
。
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