--- /dev/null
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package com.android.settings.display;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.text.InputType;
+import android.util.AttributeSet;
+import android.util.DisplayMetrics;
+import android.view.Display;
+import android.view.View;
+import android.widget.EditText;
+import com.android.settings.CustomEditTextPreference;
+import com.android.settings.R;
+import com.android.settingslib.display.DisplayDensityUtils;
+
+public class DensityPreference extends CustomEditTextPreference {
+
+ public DensityPreference(Context context, AttributeSet attrs) {
+ super(context, attrs);
+ }
+
+ @Override
+ public void onAttached() {
+ super.onAttached();
+
+ setSummary(getContext().getString(R.string.developer_density_summary, getCurrentSwDp()));
+ }
+
+ private int getCurrentSwDp() {
+ final Resources res = getContext().getResources();
+ final DisplayMetrics metrics = res.getDisplayMetrics();
+ final float density = metrics.density;
+ final int minDimensionPx = Math.min(metrics.widthPixels, metrics.heightPixels);
+ return (int) (minDimensionPx / density);
+ }
+
+ @Override
+ protected void onBindDialogView(View view) {
+ super.onBindDialogView(view);
+
+ final EditText editText = (EditText) view.findViewById(android.R.id.edit);
+
+ if (editText != null) {
+ editText.setInputType(InputType.TYPE_CLASS_NUMBER);
+ editText.setText(getCurrentSwDp() + "");
+ }
+ }
+
+ @Override
+ protected void onDialogClosed(boolean positiveResult) {
+ if (positiveResult) {
+ final Resources res = getContext().getResources();
+ final DisplayMetrics metrics = res.getDisplayMetrics();
+ final int newSwDp = Math.max(Integer.parseInt(getText()), 320);
+ final int minDimensionPx = Math.min(metrics.widthPixels, metrics.heightPixels);
+ final int newDensity = DisplayMetrics.DENSITY_MEDIUM * minDimensionPx / newSwDp;
+ final int densityDpi = Math.max(newDensity, 120);
+ DisplayDensityUtils.setForcedDisplayDensity(Display.DEFAULT_DISPLAY, densityDpi);
+ }
+ }
+}