How to add a button to PreferenceScreen
I know this is a bit late, but I just found a solution i like better than Max's praised solution.
You can simply add a footer (or if you like the button to be on top, a header) to the PreferenceActivity's ListView like so:
public class MyActivity extends PreferenceActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
ListView v = getListView();
v.addFooterView(new Button(this));
}
}
I hope this helps someone.
This example below will render a button at the bottom of the page (in case anybody is still interested).
In case of a LinearLayout you could also apply weights; this is needed because the Listview is set to *fill_parent*. I usually do this by adding *android:layout_weight* 's:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:layout_weight="10"/>
<Button android:text="This is a button on top of all preferences."
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_weight="1"/>
</LinearLayout>
The explanation below isn't propbably 100% but it will help you understand...
+-- View Port (linear layout)
| +-- List View (this is where the preferences will go)
| |
| |
| +--
+--
+--
| Button (which was pushed out of view by the fillparent of ListView
+--
You could also say, because the Button has no weight; the button is rendered at 0dp height.
Now with the layout_weigths added it will lett the button render inview
+-- View Port (linear layout)
| +-- List View (this is where the preferences will go)
| |
| |
| +--
| +--
| | Button (which was pushed out of view by the fillparent of ListView
| +--
+--
There is another solution for customizing the appearance of the preferences.
Design a normal XML layout with buttons or whatever you want to add to the standard preferences. Include a ListView in your layout and give it the ID @android:id/list.
Let's say we call the layout file res/layout/main.xml. It could look something like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button android:text="This is a button on top of all preferences."
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ListView android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
In your PreferenceActivity, add these two lines to your onCreate:
addPreferencesFromResource(R.xml.preferences);
setContentView(R.layout.main);
The ListView in your layout will then be replaced by the preferences defined the usual way in res/xml/preferences.xml.
Actually, there is a solution. Here is a code, i hope, this will be useful for anyone. It looks like 3 options and 2 buttons in the bottom of the screen, independent of screen resolution (was targeted to 240 as lowest)
package com.myapplication.gui;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceScreen;
import android.view.Display;
import android.view.Gravity;
import android.view.WindowManager;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ScrollView;
import com.myproject.general.HeightListView;
import com.myapplication.R;
public class FilterActivity extends PreferenceActivity {
private LinearLayout rootView;
private LinearLayout buttonView;
private Button buttonDone;
private Button buttonRevert;
private ListView preferenceView;
private LinearLayout gradientView;
private ScrollView scrollRoot;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int height = display.getHeight();
int width = height > 240 ? display.getWidth() : display.getWidth() - 4;
scrollRoot = new ScrollView(this);
scrollRoot.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
rootView = new LinearLayout(this);
rootView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
rootView.setOrientation(LinearLayout.VERTICAL);
buttonView = new LinearLayout(this);
buttonView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
buttonView.setOrientation(LinearLayout.HORIZONTAL);
buttonView.setGravity(Gravity.BOTTOM);
gradientView = new LinearLayout(this);
gradientView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
gradientView.setOrientation(LinearLayout.HORIZONTAL);
gradientView.setBackgroundResource(R.drawable.gradient);
gradientView.setPadding(0, 5, 0, 0);
gradientView.setBackgroundResource(R.drawable.gradient);
buttonDone = new Button(this);
buttonDone.setText(R.string.filterButton_Done);
buttonDone.setLayoutParams(new LayoutParams(width/2, LayoutParams.WRAP_CONTENT));
gradientView.addView(buttonDone);
buttonRevert = new Button(this);
buttonRevert.setText(R.string.filterButton_Revert);
buttonRevert.setLayoutParams(new LayoutParams(width/2, LayoutParams.WRAP_CONTENT));
gradientView.addView(buttonRevert);
buttonView.addView(gradientView);
preferenceView = new HeightListView(this);
preferenceView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
preferenceView.setId(android.R.id.list);
PreferenceScreen screen = createPreferenceHierarchy();
screen.bind(preferenceView);
preferenceView.setAdapter(screen.getRootAdapter());
rootView.addView(preferenceView);
rootView.addView(buttonView);
if (height > 240) {
this.setContentView(rootView);
}
else {
scrollRoot.addView(rootView);
this.setContentView(scrollRoot);
}
setPreferenceScreen(screen);
}
private PreferenceScreen createPreferenceHierarchy() {
PreferenceScreen root = getPreferenceManager().createPreferenceScreen(this);
PreferenceScreen pref1 = getPreferenceManager().createPreferenceScreen(this);
pref1.setKey("pref1");
pref1.setTitle("Title");
pref1.setSummary("Summary");
root.addPreference(pref1);
PreferenceScreen pref2 = getPreferenceManager().createPreferenceScreen(this);
pref2.setKey("pref2");
pref2.setTitle("Title");
pref2.setSummary("Summary");
root.addPreference(pref2);
PreferenceScreen pref3 = getPreferenceManager().createPreferenceScreen(this);
pref3.setKey("pref3");
pref3.setTitle("Title");
pref3.setSummary("Summary");
root.addPreference(pref3);
return root;
}
}