Android menu check box and androidmenu check box

Android menu check box and androidmenu check box

A beginner in android, which is currently in an android demand, needs to integrate a media player, add a checkbox in the menu, stop the player when the checkbox is selected, and start the player when the player is deselected, currently, I have enabled checkbox to stop the player.

When I unselect the checkbox, an error is reported. I haven't found the cause for a long time. The mood is bad .....

My code is as follows:
MainActivity

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@Override    publicboolean onOptionsItemSelected(MenuItem item)    {        //Switch-sats i syfte om att det kommer tillkomma fler alternativ        //Switchen bygger på att hämta rätt id ifrån användarens val        switch(item.getItemId())        {        caseR.id.action_help:                //Bytar Activity till help                Intent intent = newIntent(MainActivity1.this, help.class);                startActivity(intent);            returntrue;         caseR.id.music:            finalCheckBox music = (CheckBox)findViewById(R.id.music);            music.setChecked(true);            music.setOnClickListener(newOnClickListener(){                publicvoid onClick(View v){                 if(((CheckBox) v).isChecked()) {                    backsound = MediaPlayer.create(MainActivity1.this, R.raw.backsound);                    backsound.start();                    backsound.setLooping(true);                }else{                    music.setChecked(false);                    backsound.stop();                }            }});         default:            returnsuper.onOptionsItemSelected(item);        }}}

Main_activity.xml

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<menu xmlns:android="http://schemas.android.com/apk/res/android" > <item    android:id="@+id/action_settings"    android:orderInCategory="100"    android:showAsAction="never"    android:title="@string/action_settings"/> <item    android:id="@+id/action_help"    android:orderInCategory="100"    android:showAsAction="never"    android:title="@string/help"/> <item     android:id="@+id/music"     android:title="@string/musik"     android:checkable="true"     android:checked="true" />

Solution

1

<preferencescreenxmlns:android="http://schemas.android.com/apk/res/android">      <preferencecategoryandroid:title="@string/title_category"android:summary="@string/summary_category">            <checkboxpreferenceandroid:title="@string/title_main"android:summary="@string/summary_main"android:defaultvalue="true"android:key="main">                   </checkboxpreference></preferencecategory><!--Any other categories include here--></preferencescreen>

You only need to set setting android: dependancy to implement this function. Now you can create an xml file in the res directory, put the above xml code, and then perform the following operations:

 

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publicclass SettingsActivity extendsPreferenceActivity {@Override    protectedvoid onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        addPreferencesFromResource(R.xml.preferences);    }}

Of course, you can also do it in other ways, such as fragments, but this method is simpler.

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