我创建了android偏好活动,以这种方式更改字体
Android偏好设置活动正常但我想在ListPreference中显示字体预览
像这样 font changingpublic class SettingsActivity extends AppCompatPreferenceActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setupActionBar();
}
/**
* Set up the {@link android.app.ActionBar}, if the API is available.
*/
private void setupActionBar() {
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
// Show the Up button in the action bar.
actionBar.setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
if (!super.onMenuItemSelected(featureId, item)) {
NavUtils.navigateUpFromSameTask(this);
}
return true;
}
return super.onMenuItemSelected(featureId, item);
}
/**
* {@inheritDoc}
*/
@Override
public boolean onIsMultiPane() {
return isXLargeTablet(this);
}
/**
* Helper method to determine if the device has an extra-large screen. For
* example, 10" tablets are extra-large.
*/
private static boolean isXLargeTablet(Context context) {
return (context.getResources().getConfiguration().screenLayout
& Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
}
/**
* {@inheritDoc}
*/
@Override
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void onBuildHeaders(List<Header> target) {
loadHeadersFromResource(R.xml.pref_headers, target);
}
/**
* A preference value change listener that updates the preference's summary
* to reflect its new value.
*/
private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener =
new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object value) {
}
}
};
private static void bindPreferenceSummaryToValue(Preference preference) {
// Set the listener to watch for value changes.
preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);
............................;
}
/**
* This method stops fragment injection in malicious applications.
* Make sure to deny any unknown fragments here.
*/
protected boolean isValidFragment(String fragmentName) {
return PreferenceFragment.class.getName().equals(fragmentName)
|| fontPreferenceFragment.class.getName().equals(fragmentName);
}
// Font PreferenceFragment
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static class fontPreferenceFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.pref_font);
setHasOptionsMenu(true);
bindPreferenceSummaryToValue(findPreference("font"));
bindPreferenceSummaryToValue(findPreference("fontsizes"));
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
startActivity(new Intent(getActivity(), SettingsActivity.class));
return true;
}
return super.onOptionsItemSelected(item);
}
}
}
和R.xml.pref_font是
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<ListPreference
android:defaultValue="1"
android:entries="@array/pref_font_list_titles"
android:entryValues="@array/pref_font_list_titles_values"
android:key="font"
android:negativeButtonText="@null"
android:positiveButtonText="@null"
android:title="@string/pref_font_title_header"/>
<ListPreference
android:defaultValue="1"
android:entries="@array/pref_font_size_titles"
android:entryValues="@array/pref_font_size_titles_values"
android:key="fontsizes"
android:negativeButtonText="@null"
android:positiveButtonText="@null"
android:title="Font size"
/>
答案 0 :(得分:1)
经过长时间的搜索,我想出了如何做到这一点
设置页面XML文件
<com.........ArabicFontNameListPreference
android:defaultValue="1"
android:entries="@array/pref_font_list_titles_ar"
android:entryValues="@array/pref_font_list_titles_values_ar"
android:key="font_ar"
android:negativeButtonText="@null"
android:positiveButtonText="@null"
android:title="@string/pref_font_title_ar"
android:summary="@string/pref_font_title_ar_summary">
</com.........ArabicFontNameListPreference>
和ArabicFontNameListPreference.java
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Typeface;
import android.preference.ListPreference;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckedTextView;
/**
* Created by Basil on 04-03-2016.
*/
public class ArabicFontNameListPreference extends ListPreference {
private int mClickedDialogEntryIndex;
public ArabicFontNameListPreference(Context context) {
super(context);
}
public ArabicFontNameListPreference(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
if (getEntries() == null || getEntryValues() == null) {
super.onPrepareDialogBuilder(builder);
return;
}
ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(getContext(), R.layout.preference_ar_font_name, getEntries()) {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
float fontSizePx = getContext().getResources().getDimension(R.dimen.def_font_size_list_pref);
Typeface tf = null;
CheckedTextView view = (CheckedTextView) convertView;
if (view == null) {
view = (CheckedTextView) View.inflate(getContext(), R.layout.preference_ar_font_name, null);
}
switch (position) {
case 0:
// fontSizePx = getContext().getResources().getDimension(R.dimen.font_size_small_small);
tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/RobotoRegular.ttf");
break;
case 1:
tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/RobotoRegular.ttf");
// fontSizePx = getContext().getResources().getDimension(R.dimen.font_size_medium_medium);
break;
// case 2:
// tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/MADDINA.ttf");
//// fontSizePx = getContext().getResources().getDimension(R.dimen.font_size_small_medium);
// break;
// case 3:
// tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/trado.ttf");
// break;
// case 4:
// tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/ScheherazadeRegOT.ttf");
// break;
// case 5:
// tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/Symbols1_Ver02 (1).otf");
// break;
// case 6:
// tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/UthmanTN1 Ver10.otf");
// break;
default:
}
view.setText(getEntries()[position]);
view.setTextSize(TypedValue.COMPLEX_UNIT_PX, fontSizePx);
view.setTypeface(tf, Typeface.BOLD);
return view;
}
};
mClickedDialogEntryIndex = findIndexOfValue(getValue());
builder.setSingleChoiceItems(adapter, mClickedDialogEntryIndex, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
mClickedDialogEntryIndex = which;
ArabicFontNameListPreference.this.onClick(dialog, DialogInterface.BUTTON_POSITIVE);
dialog.dismiss();
}
});
builder.setPositiveButton(null, null);
}
@Override
protected void onDialogClosed(boolean positiveResult) {
super.onDialogClosed(positiveResult);
if (positiveResult && mClickedDialogEntryIndex >= 0 && getEntryValues() != null) {
String val = getEntryValues()[mClickedDialogEntryIndex].toString();
if (callChangeListener(val)) {
setValue(val);
}
}
}
}
和preference_ar_font_name.xml为
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/text1"
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeightSmall"
android:height="48dp"
android:checkMark="@null"
android:drawableLeft="?android:attr/listChoiceIndicatorSingle"
android:drawableStart="?android:attr/listChoiceIndicatorSingle"
android:gravity="center_vertical"
android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
android:paddingRight="?android:attr/listPreferredItemPaddingRight"
android:paddingStart="?android:attr/listPreferredItemPaddingStart"
android:textAppearance="?android:attr/textAppearanceListItemSmall" />