我的偏好活动除了一件事情外,还是有效的.在所有其他活动中完美地将用户返回给先前活动的ActionBar图标在PreferenceActivity中不起作用.当我点击图标时,它将闪烁,就像它将返回到上一个活动,但是PreferenceActivity保持在屏幕上.有趣的是,后退按钮确实会将用户返回到上一个活动.有没有办法使ActionBar的Home图标在“PreferenceActivity”中正常工作？
这是代码：
public class SettingsActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set actionBar controls for Settings
TextView actionBarTitle = (TextView) findViewById(Resources.getSystem().getIdentifier("action_bar_title","id","android"));
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setIcon(R.drawable.ic_launcher);
actionBar.setDisplayShowTitleEnabled(true);
actionBarTitle.setTextColor(Color.WHITE);
actionBarTitle.setTextSize(16);
actionBar.setTitle(R.string.settings_menu_title);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { //Build.VERSION_CODES.ICE_CREAM_SANDWICH
actionBar.setHomeButtonEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true); // show back arrow on title icon
actionBar.setDisplayShowHomeEnabled(true);
}
...... Handle prefs (all working fine).....
}
}
//////呼叫代码////////
//Use menu button to access settings screen
@Override
public boolean onKeyDown(int keycode,KeyEvent e) {
switch(keycode) {
case KeyEvent.KEYCODE_MENU:
Intent intent = new Intent(this,SettingsActivity.class);
startActivity(intent);
return true;
}
return super.onKeyDown(keycode,e);
} // [END onKeyDown (for menu click capture) ]
解决方法
感谢@Axarydax指出我正确的方向.我意识到PreferenceActivity与我的其他活动不同,因为Home按钮返回到调用Activity而不是MainActivity.因此,解决方案需要(1)使用startActivityForResult(而不是startActivity)调用PreferenceActivity,(2)使用PreferenceActivity中的onOptionsItemSelected来管理返回值(per @ Axarydax的答案). (1)和(2)如下所示：
// (1) Menu button used to access PreferenceActivity
@Override
public boolean onKeyDown(int keycode,KeyEvent e) {
switch(keycode) {
case KeyEvent.KEYCODE_MENU:
Intent intent = new Intent(this,SettingsActivity.class);
startActivityForResult(intent,1); //enables return to here
return true;
}
return super.onKeyDown(keycode,e);
}
// (2) Return to calling activity from PreferenceActivity
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
int SUCCESS_RESULT=1;
setResult(SUCCESS_RESULT,new Intent());
finish(); //return to caller
return true;
}
return false;
}
