1/* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.support.v4.widget; 18 19import android.util.Log; 20import android.widget.TextView; 21 22import java.lang.reflect.Field; 23 24class TextViewCompatDonut { 25 26 private static final String LOG_TAG = "TextViewCompatDonut"; 27 private static final int LINES = 1; 28 29 private static Field sMaximumField; 30 private static boolean sMaximumFieldFetched; 31 private static Field sMaxModeField; 32 private static boolean sMaxModeFieldFetched; 33 34 private static Field sMinimumField; 35 private static boolean sMinimumFieldFetched; 36 private static Field sMinModeField; 37 private static boolean sMinModeFieldFetched; 38 39 static int getMaxLines(TextView textView) { 40 if (!sMaxModeFieldFetched) { 41 sMaxModeField = retrieveField("mMaxMode"); 42 sMaxModeFieldFetched = true; 43 } 44 if (sMaxModeField != null && retrieveIntFromField(sMaxModeField, textView) == LINES) { 45 // If the max mode is using lines, we can grab the maximum value 46 if (!sMaximumFieldFetched) { 47 sMaximumField = retrieveField("mMaximum"); 48 sMaximumFieldFetched = true; 49 } 50 if (sMaximumField != null) { 51 return retrieveIntFromField(sMaximumField, textView); 52 } 53 } 54 return -1; 55 } 56 57 static int getMinLines(TextView textView) { 58 if (!sMinModeFieldFetched) { 59 sMinModeField = retrieveField("mMinMode"); 60 sMinModeFieldFetched = true; 61 } 62 if (sMinModeField != null && retrieveIntFromField(sMinModeField, textView) == LINES) { 63 // If the min mode is using lines, we can grab the maximum value 64 if (!sMinimumFieldFetched) { 65 sMinimumField = retrieveField("mMinimum"); 66 sMinimumFieldFetched = true; 67 } 68 if (sMinimumField != null) { 69 return retrieveIntFromField(sMinimumField, textView); 70 } 71 } 72 return -1; 73 } 74 75 private static Field retrieveField(String fieldName) { 76 Field field = null; 77 try { 78 field = TextView.class.getDeclaredField(fieldName); 79 field.setAccessible(true); 80 } catch (NoSuchFieldException e) { 81 Log.e(LOG_TAG, "Could not retrieve " + fieldName + " field."); 82 } 83 return field; 84 } 85 86 private static int retrieveIntFromField(Field field, TextView textView) { 87 try { 88 return field.getInt(textView); 89 } catch (IllegalAccessException e) { 90 Log.d(LOG_TAG, "Could not retrieve value of " + field.getName() + " field."); 91 } 92 return -1; 93 } 94 95 static void setTextAppearance(TextView textView, int resId) { 96 textView.setTextAppearance(textView.getContext(), resId); 97 } 98} 99