当我访问 PreferenceScreen 时，我注意到我的自定义开关已关闭。然后我打开它并重新启动应用程序。我回到 PreferenceScreen，开关又关闭了。当我使用默认的 SwitchPreference 时，不会发生这种情况。我可以按照我想要的方式自定义 SwitchPreference，所以唯一的问题是开关值没有保存。我有四个与自定义 SwitchPreference 相关的文件，所有首选项都放在 PreferenceFragment 的扩展中
SettingsFragment.java
public class SettingsFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preferences);
}
}
首选项.xml：
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android"
android:title="Settings"
>
<com.example.CustomSwitchPreference
android:key="vibration"
android:title="vibration"
android:summary=""
android:defaultValue="true" />
</PreferenceScreen>
CustomSwitchPreference.java：
public class CustomSwitchPreference extends SwitchPreference {
public CustomSwitchPreference(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomSwitchPreference(Context context) {
super(context);
}
@Override
protected View onCreateView( ViewGroup parent )
{
LayoutInflater li = (LayoutInflater)getContext().getSystemService( Context.LAYOUT_INFLATER_SERVICE );
return li.inflate( R.layout.customswitch_preference, parent, false);
}
/*
@Override
protected void onBindView(View view) {
MainActivity mainActivity = (MainActivity)getContext();
RelativeLayout relativeLayout = (RelativeLayout)mainActivity.findViewById(R.id.switch_frame);
Switch s = (Switch)relativeLayout.getChildAt(1);
s.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
persistBoolean(isChecked);
}
});
super.onBindView(view);
}
*/
}
customswitch_preference.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/switch_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/switch_title"
android:textSize="18sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Title"
android:layout_alignParentStart="true"/>
<Switch
android:id="@+id/switch_pref"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
/>
</RelativeLayout>
MainActivity.java：
public class MainActivity extends Activity {
private ActionBar actionBar;
private boolean mInit = false;
private boolean showIcon = true;
private Menu m;
private GridFragment gridFragment;
private SettingsFragment settingsFragment;
public ImageButton startButton;
public TextView gameTimer;
public TextView mineCount;
public boolean isVibrating;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
settingsFragment = new SettingsFragment();
actionBar = getActionBar();
actionBar.setTitle("Settings");
actionBar.setCustomView(R.layout.actionbar);
//actionBar.setDisplayShowTitleEnabled(false);
actionBar.setDisplayShowCustomEnabled(true);
actionBar.setDisplayUseLogoEnabled(false);
actionBar.setDisplayShowHomeEnabled(false);
//actionBar.setBackgroundDrawable(new ColorDrawable(Color.BLACK));
ViewGroup actionBarViews = (ViewGroup)actionBar.getCustomView();
startButton = (ImageButton)(actionBarViews.findViewById(R.id.actionBarLogo));
mineCount = (TextView)actionBarViews.findViewById(R.id.topTextViewLeft);
gameTimer = (TextView)actionBarViews.findViewById(R.id.topTextViewRight);
startButton.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
startButton.setImageResource(R.drawable.smiley2);
break;
case MotionEvent.ACTION_UP:
restartGame();
break;
}
return false;
}
});
Typeface myTypeface = Typeface.createFromAsset(getAssets(), "fonts/digital-7 (mono).ttf");
TextView textView;
int[] resources =
{R.id.textViewLeft,R.id.topTextViewLeft,R.id.textViewRight,R.id.topTextViewRight};
for(int r: resources) {
textView = (TextView) findViewById(r);
textView.setTypeface(myTypeface);
}
if (findViewById(R.id.fragment_container) != null){
if (savedInstanceState != null) {
return;
}
}
}
public void restartGame() {
startButton.setImageResource(R.drawable.smiley);
getFragmentManager().beginTransaction().remove(gridFragment).commit();
setText(999, gameTimer);
startGame();
}
private void startGame(){
gridFragment = new GridFragment();
gridFragment.setArguments(getIntent().getExtras());
getFragmentManager().beginTransaction().add(R.id.fragment_container, gridFragment,"gridFragment").commit();
}
public void setText(int value, TextView textView){
value = Math.min(999,value);
value = Math.max(-99,value);
textView.setText(String.format("%03d",value));
}
@Override
protected void onStart() {
if (!mInit) {
mInit = true;
Database db = new Database(this);
db.deleteAllSessions();
db.close();
startGame();
}
super.onStart();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
m = menu;
return true;
}
private void openSettings(){
showIcon = false;
gridFragment.pauseTimer();
onPrepareOptionsMenu(m);
actionBar.setDisplayShowCustomEnabled(false);
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.setCustomAnimations(android.R.animator.fade_in, android.R.animator.fade_out);
ft.hide(gridFragment);
ft.add(android.R.id.content, settingsFragment).commit();
//ft.replace(android.R.id.content,settingsFragment);
}
private void updateSettings(){
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
Map<String, ?> map = sharedPrefs.getAll();
for (Map.Entry<String, ?> entry : map.entrySet()) {
Log.d("map values", entry.getKey() + ": " + entry.getValue().toString());
}
isVibrating = (Boolean)map.get("vibration");
}
private void closeSettings(){
showIcon = true;
onPrepareOptionsMenu(m);
actionBar.setDisplayShowCustomEnabled(true);
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.setCustomAnimations(android.R.animator.fade_in, android.R.animator.fade_out);
ft.show(gridFragment);
ft.remove(settingsFragment).commit();
//ft.replace(android.R.id.content,gridFragment);
gridFragment.resumeTimer();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
openSettings();
return true;
}
else if(id == R.id.backButton){
updateSettings();
closeSettings();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
MenuItem item= menu.findItem(R.id.action_settings);
item.setVisible(showIcon);
item = menu.findItem(R.id.backButton);
item.setVisible(!showIcon);
return super.onPrepareOptionsMenu(menu);
}
}