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libgdx 游戏开发
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Display back button on action bar and back event

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原文地址:
https://stackoverflow.com/a/37185334

I think onSupportNavigateUp() is best and Easiest way to do so
check the code below
if you want it programmatically Add this line in onCreate() method
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
Note: make sure Actionbar is not null.

And Override this method
@Override
public boolean onSupportNavigateUp(){  
    finish();  
    return true;  
}

thats it
OR Non-programmatically you can add meta to the activity in manifest file as
<meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value="MainActivity" />


Other solution:
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        onBackPressed();
    }
});
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