在Activity的onCreate方法中添加如下代码:
ActionBar actionBar = getSupportActionBar();
if(actionBar != null){
actionBar.setHomeButtonEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
}
然后重写onOptionsItemSelected方法:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
this.finish(); // back button
return true;
}
return super.onOptionsItemSelected(item);
}