1 /* 2 * Copyright 2014 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.example.helloandroidcamera2; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.util.Log; 22 import android.view.SurfaceView; 23 24 /** 25 * A {@link SurfaceView} that can be adjusted to a specified aspect ratio. 26 */ 27 public class AutoFitSurfaceView extends SurfaceView { 28 29 private static final String TAG = "AutoFitSurfaceView"; 30 31 private int mRatioWidth = 0; 32 private int mRatioHeight = 0; 33 AutoFitSurfaceView(Context context)34 public AutoFitSurfaceView(Context context) { 35 this(context, null); 36 } 37 AutoFitSurfaceView(Context context, AttributeSet attrs)38 public AutoFitSurfaceView(Context context, AttributeSet attrs) { 39 this(context, attrs, 0); 40 } 41 AutoFitSurfaceView(Context context, AttributeSet attrs, int defStyle)42 public AutoFitSurfaceView(Context context, AttributeSet attrs, int defStyle) { 43 super(context, attrs, defStyle); 44 } 45 46 /** 47 * Sets the aspect ratio for this view. The size of the view will be measured based on the ratio 48 * calculated from the parameters. Note that the actual sizes of parameters don't matter, that 49 * is, calling setAspectRatio(2, 3) and setAspectRatio(4, 6) make the same result. 50 * 51 * @param width Relative horizontal size 52 * @param height Relative vertical size 53 */ setAspectRatio(int width, int height)54 public void setAspectRatio(int width, int height) { 55 if (width < 0 || height < 0) { 56 throw new IllegalArgumentException("Size cannot be negative."); 57 } 58 mRatioWidth = width; 59 mRatioHeight = height; 60 requestLayout(); 61 } 62 63 @Override onMeasure(int widthMeasureSpec, int heightMeasureSpec)64 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 65 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 66 int width = MeasureSpec.getSize(widthMeasureSpec); 67 int height = MeasureSpec.getSize(heightMeasureSpec); 68 if (0 == mRatioWidth || 0 == mRatioHeight) { 69 Log.d(TAG, String.format("aspect ratio is 0 x 0 (uninitialized), setting measured" 70 + " dimension to: %d x %d", width, height)); 71 setMeasuredDimension(width, height); 72 } else { 73 if (width < height * mRatioWidth / mRatioHeight) { 74 Log.d(TAG, String.format("setting measured dimension to %d x %d", width, height)); 75 setMeasuredDimension(width, width * mRatioHeight / mRatioWidth); 76 } else { 77 Log.d(TAG, String.format("setting measured dimension to %d x %d", width, height)); 78 setMeasuredDimension(height * mRatioWidth / mRatioHeight, height); 79 } 80 } 81 } 82 83 }