AutoFitTextureView.java

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/*
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 * Copyright 2015 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *       http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.camera2raw;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.TextureView;
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/**
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 * A {@link TextureView} that can be adjusted to a specified aspect ratio.
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 */
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public class AutoFitTextureView extends TextureView {
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    private int mRatioWidth = 0;
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    private int mRatioHeight = 0;
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    public AutoFitTextureView(Context context) {
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        this(context, null);
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    }
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    public AutoFitTextureView(Context context, AttributeSet attrs) {
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        this(context, attrs, 0);
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    }
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    public AutoFitTextureView(Context context, AttributeSet attrs, int defStyle) {
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        super(context, attrs, defStyle);
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    }
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    /**
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     * Sets the aspect ratio for this view. The size of the view will be measured based on the ratio
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     * calculated from the parameters. Note that the actual sizes of parameters don't matter, that
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     * is, calling setAspectRatio(2, 3) and setAspectRatio(4, 6) make the same result.
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     *
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     * @param width  Relative horizontal size
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     * @param height Relative vertical size
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     */
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    public void setAspectRatio(int width, int height) {
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        if (width < 0 || height < 0) {
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            throw new IllegalArgumentException("Size cannot be negative.");
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        }
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        if (mRatioWidth == width && mRatioHeight == height) {
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            return;
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        }
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        mRatioWidth = width;
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        mRatioHeight = height;
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        requestLayout();
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    }
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    @Override
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    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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        int width = MeasureSpec.getSize(widthMeasureSpec);
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        int height = MeasureSpec.getSize(heightMeasureSpec);
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        if (0 == mRatioWidth || 0 == mRatioHeight) {
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            setMeasuredDimension(width, height);
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        } else {
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            if (width < height * mRatioWidth / mRatioHeight) {
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                setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
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            } else {
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                setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
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            }
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        }
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    }
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}
Oct	NOV	Dec
	17
2014	2015	2016
Results

AutoFitTextureView.java
