我有SettingsActivity
扩展PreferenceActivity
以显示我的应用中的设置。
有一个后退箭头,但它不起作用。
此处的SettingsActivity.java
文件代码:
public class SettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener{
private AppCompatDelegate mDelegate;
public static final String RESET_PASSWORD_KEY = "reset_password";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
getDelegate().installViewFactory();
getDelegate().onCreate(savedInstanceState);
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
SharedPreferences sharedPreferencesCompat = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
Preference myPref = (Preference) findPreference(RESET_PASSWORD_KEY);
myPref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
public boolean onPreferenceClick(Preference preference) {
//open browser or intent here
Intent resetPasswordActivityIntent = new Intent(SettingsActivity.this, ResetPasswordActivity.class);
startActivity(resetPasswordActivityIntent);
return true;
}
});
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
getDelegate().onPostCreate(savedInstanceState);
}
public ActionBar getSupportActionBar() {
return getDelegate().getSupportActionBar();
}
public void setSupportActionBar(@Nullable Toolbar toolbar) {
getDelegate().setSupportActionBar(toolbar);
getDelegate().getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public MenuInflater getMenuInflater() {
return getDelegate().getMenuInflater();
}
@Override
public void setContentView(@LayoutRes int layoutResID) {
getDelegate().setContentView(layoutResID);
}
@Override
public void setContentView(View view) {
getDelegate().setContentView(view);
}
@Override
public void setContentView(View view, ViewGroup.LayoutParams params) {
getDelegate().setContentView(view, params);
}
@Override
public void addContentView(View view, ViewGroup.LayoutParams params) {
getDelegate().addContentView(view, params);
}
@Override
protected void onPostResume() {
super.onPostResume();
getDelegate().onPostResume();
}
@Override
protected void onTitleChanged(CharSequence title, int color) {
super.onTitleChanged(title, color);
getDelegate().setTitle(title);
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
getDelegate().onConfigurationChanged(newConfig);
}
@Override
protected void onStop() {
super.onStop();
getDelegate().onStop();
}
@Override
protected void onDestroy() {
super.onDestroy();
getDelegate().onDestroy();
}
public void invalidateOptionsMenu() {
getDelegate().invalidateOptionsMenu();
}
private AppCompatDelegate getDelegate() {
if (mDelegate == null) {
mDelegate = AppCompatDelegate.create(this, null);
}
return mDelegate;
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
if (key.equals(RESET_PASSWORD_KEY)) {
}
}
}
此处的preferences.xml
文件代码:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<Preference
android:title="xxx"
android:summary="xxxxxx"
android:key="reset_password" />
</PreferenceScreen>
在这里&#39; SettingsActivity&#39;在AndroidManifest.xml
:
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings"
android:parentActivityName=".MainActivity">
</activity>
如何让箭头运作?
请告诉我。
抱歉,如果问题格式似乎不合适。我还是个初学者。
答案 0 :(得分:36)
您需要在dataLayer[0]['page.pageInfo.language']
内调用您的隐私方法setSupportActionBar()
。
此外,您可能希望实施onCreate()
:
onOptionsItemSelected
答案 1 :(得分:3)
您忘了在onCreate()
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
答案 2 :(得分:3)
我对你可能想要实现的目标做了一些假设。如果要使用具有PreferenceActivity的自定义工具栏,这应该有效。以下代码在onPostCreateView()
中LinearLayout root = (LinearLayout)findViewById(android.R.id.list).getParent().getParent().getParent();
mToolBar = (Toolbar) LayoutInflater.from(this).inflate(R.layout.toolbar, root,false);
mToolBar.setTitle(R.string.title);
// insert at top
root.addView(mToolBar, 0);
setSupportActionBar(mToolBar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
答案 3 :(得分:0)
在Android targetSdkVersion 29
在onCreate()
内
getActionBar().setDisplayHomeAsUpEnabled(true);
然后从@Matias Elorriaga Answer实现onOptionsItemSelected
答案 4 :(得分:0)
您可以这样做
@Override
public boolean onSupportNavigateUp() {
onBackPressed();
return true;
}