1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 5 * except in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the 10 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 11 * KIND, either express or implied. See the License for the specific language governing 12 * permissions and limitations under the License. 13 */ 14 15 package com.android.settings.display; 16 17 import android.content.Context; 18 import android.content.res.Resources; 19 import android.text.BidiFormatter; 20 import android.text.InputType; 21 import android.util.AttributeSet; 22 import android.util.DisplayMetrics; 23 import android.util.Slog; 24 import android.view.Display; 25 import android.view.View; 26 import android.widget.EditText; 27 28 import com.android.settings.R; 29 import com.android.settingslib.CustomEditTextPreference; 30 import com.android.settingslib.display.DisplayDensityUtils; 31 32 import java.text.NumberFormat; 33 34 public class DensityPreference extends CustomEditTextPreference { 35 private static final String TAG = "DensityPreference"; 36 37 public DensityPreference(Context context, AttributeSet attrs) { 38 super(context, attrs); 39 } 40 41 @Override 42 public void onAttached() { 43 super.onAttached(); 44 final CharSequence dpValue = BidiFormatter.getInstance() 45 .unicodeWrap(NumberFormat.getInstance().format(getCurrentSwDp())); 46 setSummary(getContext().getString(R.string.density_pixel_summary,dpValue)); 47 } 48 49 private int getCurrentSwDp() { 50 final Resources res = getContext().getResources(); 51 final DisplayMetrics metrics = res.getDisplayMetrics(); 52 final float density = metrics.density; 53 final int minDimensionPx = Math.min(metrics.widthPixels, metrics.heightPixels); 54 return (int) (minDimensionPx / density); 55 } 56 57 @Override 58 protected void onBindDialogView(View view) { 59 super.onBindDialogView(view); 60 61 final EditText editText = (EditText) view.findViewById(android.R.id.edit); 62 63 if (editText != null) { 64 editText.setInputType(InputType.TYPE_CLASS_NUMBER); 65 editText.setText(getCurrentSwDp() + ""); 66 } 67 } 68 69 @Override 70 protected void onDialogClosed(boolean positiveResult) { 71 if (positiveResult) { 72 try { 73 final Resources res = getContext().getResources(); 74 final DisplayMetrics metrics = res.getDisplayMetrics(); 75 final int newSwDp = Math.max(Integer.parseInt(getText()), 320); 76 final int minDimensionPx = Math.min(metrics.widthPixels, metrics.heightPixels); 77 final int newDensity = DisplayMetrics.DENSITY_MEDIUM * minDimensionPx / newSwDp; 78 final int densityDpi = Math.max(newDensity, 120); 79 DisplayDensityUtils.setForcedDisplayDensity(Display.DEFAULT_DISPLAY, densityDpi); 80 } catch (Exception e) { 81 // TODO: display a message instead of silently failing. 82 Slog.e(TAG, "Couldn't save density", e); 83 } 84 } 85 } 86 } 87