I have EditText in preferences and I also have EditText in my layout.So I want to get string from Preferences and use it for EditText when i click my button.So i tried like this :
public class MainActivity extends Activity{
SharedPreferences sharedPreferences;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sharedPreferences = PreferenceManager
.getDefaultSharedPreferences(getBaseContext());
}
//OnClick method
public void Button(View view) {
EditText et1 = (EditText) findViewById(R.id.edittext);
String string = sharedPreferences
.getString("ime", "default");
et1.setText(String.valueOf(string));
}
and my prefs xml :
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<EditTextPreference android:title="Uredi Text"
android:key="ime"
android:summary="ime pjesme"
/>
</PreferenceScreen>
And Everytime when I click the button EditText text becomes "default"
Do not use getBaseContext() directly - use "local context", which in your case is Activity (as activty extends Context). So in your example code, replace it with this:
sharedPreferences = PreferenceManager
.getDefaultSharedPreferences( this );
Related
How do I update my PreferenceActivity?
I've saved in the SharedPreferences the value of my CheckBox in an activity (in that case, true). And even if I go to other activities I can see that it's true. But, when I go to my PreferenceActivity, the checkbox is not checked, it's false. So what I want to know is, how do I load my SharedPreferences in my PreferenceActivity, and how do I update the CheckBox (load the value, and if it's true, set the CheckBox as checked).
Should I load it like this?
Shared Preferences SP = getSharedPreferences(DATA, MODE_PRIVATE);
fw = SP.getBoolean("fw", false);
But, how do I set the CheckBox true or false since I can't use findViewById?
EDIT:
Activity where I save the CheckBox value:
Editor edit = SP.edit();
edit.putBoolean("fw", fwbt.isChecked());
edit.commit();
My preference xml file:
<CheckBoxPreference
android:title="CheckBox FW"
android:key="fw"
android:summary="Estado do CheckBox" />
My preference Activity:
public class Prefs extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
//Don't know what to do here...
}
}
You need to create an Editor to modify the SharedPreferences.
Example
getSharedPreferences(DATA, MODE_PRIVATE).edit().putBoolean("fw", true).commit();
Update
You need to define the used SharedPreferences in the Activity, too.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getPreferenceManager().setSharedPreferencesName(DATA);
addPreferencesFromResource(R.xml.prefs);
}
I have not use PreferenceActivity before but I think you simply need to implement it like any other activity.
public class PreferenceWithHeaders extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
CheckBox cb = (CheckBox)this.findViewById(IDOFBUTTON);
... do whatever on checkbox
}
I can't find a solution, so I gave up. I've just created created a custom Preferences, it's way easier.
Anyway, I'll keep looking for a solution for this later.
You've mess it up - the PreferenceActivity writes/reads from the SharedPreferences. So in your activity do
Shared Preferences SP = PreferenceManager.getDefaultSharedPreferences(this);
Editor edit = SP.edit();
edit.putBoolean("fw", fwbt.isChecked());
edit.commit();
and the change should be there in your PreferenceActivity.
Also :
SP.edit().putBoolean("fw", fwbt.isChecked()).commit();
will do
I have made 4 radio buttons and want to save the state when any of them is clicked and then want to use that saved state in the application.How can i do that?
myOption1.setChecked(true);
myOption2.setChecked(true);
myOption3.setChecked(true);
myOption4.setChecked(true);
Override onSaveInstanceState() and onRestoreInstanceState() in your activity.
#Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putBoolean("myOption1", myOption1.isChecked());
savedInstanceState.putBoolean("myOption2", myOption2.isChecked());
savedInstanceState.putBoolean("myOption3", myOption3.isChecked());
savedInstanceState.putBoolean("myOption4", myOption4.isChecked());
}
#Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
myOption1.setChecked(savedInstanceState.getBoolean("myOption1"));
myOption2.setChecked(savedInstanceState.getBoolean("myOption2"));
myOption3.setChecked(savedInstanceState.getBoolean("myOption3"));
myOption4.setChecked(savedInstanceState.getBoolean("myOption4"));
}
If you're only going to have 4 radio buttons all in all, you might as well store their "values" in SharedPreferences (persistant storage).
Example:
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor shEditor = sharedPreferences.edit();
shEditor.putBoolean("checkbox_1", myOptionOne.isChecked());
shEditor.putBoolean("checkbox_2", myOptionTwo.isChecked());
shEditor.putBoolean("checkbox_3", myOptionThree.isChecked());
shEditor.putBoolean("checkbox_4", myOptionFour.isChecked());
shEditor.commit();
Use it by doing the following:
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
myOptionOne.setChecked(sharedPreferences.getBoolean("checkbox_1", false));
myOptionTwo.setChecked(sharedPreferences.getBoolean("checkbox_2", false));
myOptionThree.setChecked(sharedPreferences.getBoolean("checkbox_3", false));
myOptionFour.setChecked(sharedPreferences.getBoolean("checkbox_4", false));
Save that value in sharedPreferences Concept. Sample Example has been placed here that uses predefined method called addPreferencesFromResource() that will get the state of checkbox value automatically and saved in the preferences.
public class EditPreference extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.checkboxpref);
addPreferencesFromResource(R.layout.checkboxpref);
}
}
And layout Code should be this :
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
android:key="#string/checkbox_pref"
android:title="#string/eidt_preferences">
<CheckBoxPreference
android:key="#string/pref_12_time_format"
android:title="#string/time_formats"
android:summary="#string/twelve_hour"
android:defaultValue="true"/>
<CheckBoxPreference
android:key="#string/pref_show_current_location"
android:title="#string/show_current_location"
android:summary="#string/using_gps_network"
android:defaultValue="true"/>
<CheckBoxPreference
android:key="#string/pref_display_date"
android:title="#string/display_date"
android:defaultValue="true"/>
</PreferenceScreen>
Now you have retreive this stored checkbox value has follows :
SharedPreferences sharedPreference = PreferenceManager
.getDefaultSharedPreferences(getApplicationContext());
mTimeFormat = sharedPreference.getBoolean("pref_12_time_format", false);
mServiceType = sharedPreference.getBoolean(
"pref_show_current_location", false);
mDisplayDate = sharedPreference.getBoolean("pref_display_date", false);
How can I change the view of a CheckBoxPreference at runtime?
Specifically, I'd like to change a CheckBoxPreference summary depending on whether the user has checked the box or not.
If it were a normal view, I could do something like:
view1 = (TextView)findViewById(R.id.idView1);
view1.setText("some text");
But a CheckBoxPreference has no id, so I don't know how to get a "handle" to it.
I have an answer to my own question. The key is to use findPreference in a PreferenceActivity, as follows:
public class MyPreferenceActivity extends PreferenceActivity{
private SharedPreferences preferences;
private SharedPreferences.OnSharedPreferenceChangeListener prefListener;
private CheckBoxPreference pref;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
pref = (CheckBoxPreference) findPreference(res.getString(R.string.keyAccount));
pref.setSummary("something");
//-- preference change listener
prefListener = new SharedPreferences.OnSharedPreferenceChangeListener(){
public void onSharedPreferenceChanged(SharedPreferences prefs, String key){
if (key.equals(somekey)){
pref.setSummary("something new");
}
}
};
preferences.registerOnSharedPreferenceChangeListener(prefListener);
}
This is tested and works.
You should use (in XML layout file):
android:summaryOff
android:summaryOn
You can set id to CheckBoxPreference using android:id in xml like code below
<CheckBoxPreference
android:key="pref_boot_startup"
android:title="Auto start"
android:defaultValue="true"
android:id="#+id/my_CheckBoxPref"
/>
To retrieve you can use
CheckBoxPreference check = (CheckBoxPreference)findViewById(R.id.my_CheckBoxPref);
I have an application that I am trying to get to got to a specific part of a website. When the user enter the text inside of the EditText and hits the Button I want the application to take that string and enter it into the specific part of the url that I want it to go into.
First Activity
private EditText text;
private Button search;
text = (EditText) findViewById (R.id.text);
search = (Button) findViewById (R.id.Search);
search.setOnClickListener(new OnClickListener(){
public void onClick(View v){
Intent intent = new Intent (FirstActivity.this,SecondActivity.class);
intent.putExtra("string", text.getText().toString());
startActivity(intent);
}
});
Second Activity
WebView mWebView;
private EditText string;
private String string1;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.webview);
string = (EditText) findViewById (R.id.string);
string.(getIntent().getExtras().getString("string"));
mWebView = (WebView) findViewById(R.id.webview);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.loadUrl("http://www.example.com/"+string);
}
}
Any help will be appreciated thanks.
You're almost there.
string1 = getIntent().getExtras().getString("string", "");
Later edit: the name of the String variable is string1, not string. You have to change your last line, too:
mWebView.loadUrl("http://www.example.com/"+string1);
Consider using less confusing, more descriptive variable names. It will help a lot on the long run.
I've got a preferences.xml stored in my res/xml folder:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory>
<Preference android:key="units_length" android:title="imperial"></Preference>
</PreferenceCategory>
</PreferenceScreen>
Here is how the onCreate method looks like in my activity:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.results);
// Get preferences
SharedPreferences preferences = getSharedPreferences("preferences", 0);
// Fetch the text view
TextView text = (TextView) findViewById(R.id.textView1);
// Set new text
text.setText(preferences.getString("units_length", "nothing"));
}
My application just says "nothing". What am I doing wrong here?
Try setting android:defaultValue attribute in your preference xml definition to whatever appropriate. It seems that property have never been initialized.