在一个Android手机的我得到一个NullPointerException和另一个我不是。我试图为我的隐私设置保存多个复选框状态。正如我在其中一款手机上所说的那样,它可以正常工作,将其保存到sharedPreferences中,但在我的主手机上,只要打开“活动”,它就会崩溃。任何人都看到这个问题?获取NullPointerException与复选框
public class PrivacySettings extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {
CheckBox showAge,showLocation,showRelationship,showGender,showFacebookButton;
String TAG = getPackageName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_privacy_settings);
showAge=(CheckBox)findViewById(R.id.cbShowAge);
showAge.setChecked(getFromSP("cbShowAge"));
showAge.setOnCheckedChangeListener(this);
showLocation=(CheckBox)findViewById(R.id.cbShowLocation);
showLocation.setChecked(getFromSP("cbShowLocation"));
showLocation.setOnCheckedChangeListener(this);
showRelationship=(CheckBox)findViewById(R.id.cbShowRelationshipStatus);
showRelationship.setChecked(getFromSP("cbShowRelationship"));
showRelationship.setOnCheckedChangeListener(this);
showGender=(CheckBox)findViewById(R.id.cbShowGender);
showGender.setChecked(getFromSP("cbShowGender"));
showGender.setOnCheckedChangeListener(this);
showFacebookButton=(CheckBox)findViewById(R.id.cbShowFacebookLink);
showFacebookButton.setChecked(getFromSP("cbShowFacebookButton"));
showFacebookButton.setOnCheckedChangeListener(this);
setTitle("Privacy Settings");
Toolbar toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
private boolean getFromSP(String key){
SharedPreferences preferences = getApplicationContext().getSharedPreferences(TAG, android.content.Context.MODE_PRIVATE);
return preferences.getBoolean(key, false);
}
private void saveInSp(String key,boolean value){
SharedPreferences preferences = getApplicationContext().getSharedPreferences(TAG, android.content.Context.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putBoolean(key, value);
editor.apply();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_privacy_settings, menu);
return true;
}
@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();
if (id == R.id.home) {
NavUtils.navigateUpFromSameTask(this);
}
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
switch(buttonView.getId()){
case R.id.cbShowAge:
saveInSp("cbShowAge",isChecked);
break;
case R.id.cbShowLocation:
saveInSp("cbShowLocation",isChecked);
break;
case R.id.cbShowRelationshipStatus:
saveInSp("cbShowRelationship",isChecked);
break;
case R.id.cbShowGender:
saveInSp("cbShowGender",isChecked);
break;
case R.id.cbShowFacebookLink:
saveInSp("cbShowFacebookButton",isChecked);
break;
}
}
编辑:
我改变了标签名 “Different_name” 只是为了测试它和它的工作。任何人都可以解释为什么它的工作是这样的SharedPreferences preferences = getApplicationContext().getSharedPreferences("Different_name", android.content.Context.MODE_PRIVATE);
?
手机是否具有不同的屏幕分辨率? – ryguy
发布logcat。 –
是的,但是这与什么有关?我会等一下。 – Ivan