1 /* 2 * Copyright (C) 2013 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 17 package com.android.inputmethod.compat; 18 19 import android.view.View; 20 21 import java.lang.reflect.Method; 22 23 public final class ViewCompatUtils { 24 // Note that View.LAYOUT_DIRECTION_LTR and View.LAYOUT_DIRECTION_RTL have been introduced in 25 // API level 17 (Build.VERSION_CODE.JELLY_BEAN_MR1). 26 public static final int LAYOUT_DIRECTION_LTR = (Integer)CompatUtils.getFieldValue(null, 0x0, 27 CompatUtils.getField(View.class, "LAYOUT_DIRECTION_LTR")); 28 public static final int LAYOUT_DIRECTION_RTL = (Integer)CompatUtils.getFieldValue(null, 0x1, 29 CompatUtils.getField(View.class, "LAYOUT_DIRECTION_RTL")); 30 31 // Note that View.getPaddingEnd(), View.setPaddingRelative(int,int,int,int), and 32 // View.getLayoutDirection() have been introduced in API level 17 33 // (Build.VERSION_CODE.JELLY_BEAN_MR1). 34 private static final Method METHOD_getPaddingEnd = CompatUtils.getMethod( 35 View.class, "getPaddingEnd"); 36 private static final Method METHOD_setPaddingRelative = CompatUtils.getMethod( 37 View.class, "setPaddingRelative", 38 Integer.TYPE, Integer.TYPE, Integer.TYPE, Integer.TYPE); 39 private static final Method METHOD_getLayoutDirection = CompatUtils.getMethod( 40 View.class, "getLayoutDirection"); 41 ViewCompatUtils()42 private ViewCompatUtils() { 43 // This utility class is not publicly instantiable. 44 } 45 getPaddingEnd(final View view)46 public static int getPaddingEnd(final View view) { 47 if (METHOD_getPaddingEnd == null) { 48 return view.getPaddingRight(); 49 } 50 return (Integer)CompatUtils.invoke(view, 0, METHOD_getPaddingEnd); 51 } 52 setPaddingRelative(final View view, final int start, final int top, final int end, final int bottom)53 public static void setPaddingRelative(final View view, final int start, final int top, 54 final int end, final int bottom) { 55 if (METHOD_setPaddingRelative == null) { 56 view.setPadding(start, top, end, bottom); 57 return; 58 } 59 CompatUtils.invoke(view, null, METHOD_setPaddingRelative, start, top, end, bottom); 60 } 61 getLayoutDirection(final View view)62 public static int getLayoutDirection(final View view) { 63 if (METHOD_getLayoutDirection == null) { 64 return LAYOUT_DIRECTION_LTR; 65 } 66 return (Integer)CompatUtils.invoke(view, 0, METHOD_getLayoutDirection); 67 } 68 } 69