[英]onResume never been called when click the phone hardware back button on android?
我正面临这个问题,我有 MainActivity 和 SettingsPreference,所以当我从设置返回到 MainActivity 时我想在 MainActivity 上重新加载适配器我使用了 onResume() 当我点击 ActionBar 后退按钮时它工作得很好,但是当我在硬件上尝试它时后退按钮它从未被调用过,我发现系统调用 onPostResume() 而不是 onResume() 所以尝试使用它,但从未应用更改
当按下 ActionBar 后退按钮时,此代码有效
@Override
protected void onResume() {
super.onResume();
dataFromSharedPrefrence = getSettingsSharedPreferences();
adapterExample.notifyDataSetChanged();
}
当硬件后退按钮被按下但更改从未应用时,系统调用 onPostResume()
@Override
protected void onPostResume() {
super.onPostResume();
dataFromSharedPrefrence = getSettingsSharedPreferences();
adapterExample.notifyDataSetChanged();
}
这是设置活动
public class SettingsActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings_activity);
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.settings, new SettingsFragment())
.commit();
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
}
public static class SettingsFragment extends PreferenceFragmentCompat {
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
setPreferencesFromResource(R.xml.root_preferences, rootKey);
}
}
当我覆盖生命周期方法时,我发现了这种差异
2020-05-05 06:00:44.899 23467-23467/com.example.test E/MainActivity: onDestroy
2020-05-05 06:00:44.907 23467-23467/com.example.test E/MainActivity: onDetachedFromWindow
2020-05-05 06:00:44.964 23467-23467/com.example.test E/MainActivity: onCreateView
2020-05-05 06:00:44.990 23467-23467/com.example.test E/MainActivity: onCreateView
2020-05-05 06:00:45.009 23467-23467/com.example.test E/MainActivity: onCreateView
2020-05-05 06:00:45.015 23467-23467/com.example.test E/MainActivity: onCreateView
2020-05-05 06:00:45.037 23467-23467/com.example.test E/MainActivity: onContentChanged
2020-05-05 06:00:45.048 23467-23467/com.example.test E/MainActivity: onStart
2020-05-05 06:00:45.051 23467-23467/com.example.test E/MainActivity: onPostCreate
2020-05-05 06:00:45.053 23467-23467/com.example.test E/MainActivity: onResume
2020-05-05 06:00:45.056 23467-23467/com.example.test E/MainActivity: onPostResume
2020-05-05 06:00:45.078 23467-23467/com.example.test E/MainActivity: onAttachedToWindow
2020-05-05 06:00:45.141 23467-23467/com.example.test E/MainActivity: onCreateView
2020-05-05 06:00:45.188 23467-23467/com.example.test E/MainActivity: onCreateView
2020-05-05 06:00:45.223 23467-23467/com.example.test E/MainActivity: onCreateView
2020-05-05 06:01:21.732 23467-23467/com.example.test E/MainActivity: onRestart
2020-05-05 06:01:21.734 23467-23467/com.example.test E/MainActivity: onStart
2020-05-05 06:01:21.738 23467-23467/com.example.test E/MainActivity: onResume
2020-05-05 06:01:21.739 23467-23467/com.example.test E/MainActivity: onPostResume
试试这个:
不要使用onResume()
尝试onStart()
:
@Override
protected void onStart() {
super.onStart();
dataFromSharedPrefrence = getSettingsSharedPreferences();
adapterExample.notifyDataSetChanged();
}
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