android imageview 图片路径 android的imageview

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mob6454cc6f8e48 2023-08-17 12:03:57

文章标签 android ImageView 圆形头像图片占位显示 ide 文章分类 Android 移动开发

ImageView 是 APP 中常用的布局控件，几乎没有不用到图片的 APP ，所以自己写写记录一下，里面的内容有些是借鉴而来，如有侵权，请与我联系。

1、图片的前景色
2、缩放显示
3、图片透明度
4、自定义的原型图显示
5、图片在 ImageView 的布局方式

实现代码
activity_image_view.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".ui.ImageViewActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <ImageView
                android:id="@+id/iv_fore"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@mipmap/iamge_view"/>

            <ImageView
                android:id="@+id/iv_zoom"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:maxWidth="300dp"
                android:maxHeight="300dp"
                android:src="@mipmap/iamge_view"/>
            <!--android:adjustViewBounds="true" 设置缩放是否保存原图宽高比例
                需要配合 maxWidth 和 maxHeight 设置，匹配这两个值中小的值-->

            <ImageView
                android:id="@+id/iv_alpha"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:alpha="0.5"
                android:src="@mipmap/iamge_view"/>
            <!--android:alpha="0.5" 设置图片透明度 0f > 1f  (float类型)-->

            <com.self.control.view.CircleImageView
                android:id="@+id/civ_circle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@mipmap/iamge_view"/>

            <ImageView
                android:id="@+id/iv_scale_type"
                android:layout_width="300dp"
                android:layout_height="300dp"
                android:src="@mipmap/iamge_view"/>
        </LinearLayout>

    </ScrollView>



</LinearLayout>

ImageViewActivity.java

import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;

import com.self.control.R;
import com.self.control.base.BaseActivity;
import com.self.control.view.CircleImageView;

import butterknife.BindView;
import butterknife.ButterKnife;

public class ImageViewActivity extends BaseActivity {

    @BindView(R.id.iv_fore)
    ImageView ivFore;
    @BindView(R.id.iv_zoom)
    ImageView ivZoom;
    @BindView(R.id.iv_alpha)
    ImageView ivAlpha;
    @BindView(R.id.civ_circle)
    CircleImageView civCircle;
    @BindView(R.id.iv_scale_type)
    ImageView ivScaleType;

    int lastX = 0, lastY = 0;

    @Override
    public void widgetClick(View v) {

    }

    @Override
    public void setListener() {

    }

    @Override
    public void initParms(Bundle parms) {

    }

    @Override
    public View bindView() {
        return null;
    }

    @Override
    public int bindLayout() {
        return R.layout.activity_image_view;
    }

    @SuppressLint({"NewApi", "ClickableViewAccessibility"})
    @Override
    public void initView(View view) {
        /**
         * 手指触摸事件,这里拖动只是顺带实现的  (这个拖动代码和 ScrollView 有些冲突，想要实现，需要单独写或者改进)
         * 主要是看 setForeground() 方法，和熟知的Background相反， foreground 是前景设置
         * 酷似蒙版效果
         */
        int wAll = getScreenWidth(this);
        int hAll = getScreenHeight(this);
        ivFore.setOnTouchListener((v, event) -> {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN://按下
                    ivFore.setForeground(getResources().getDrawable(R.color.image_fore));
                    lastX = (int) event.getRawX();
                    lastY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE://移动
                    int moveX = (int) (event.getRawX() - lastX);
                    int moveY = (int) (event.getRawY() - lastY);
                    int l, t, r, b;
                    int kuan = ivFore.getRight() - ivFore.getLeft();
                    int gao = ivFore.getBottom() - ivFore.getTop();
                    l = ivFore.getLeft() + moveX;
                    t = ivFore.getTop() + moveY;
                    r = ivFore.getRight() + moveX;
                    b = ivFore.getBottom() + moveY;

                    if (l < 0) {
                        l = 0;
                        r = kuan;
                    }
                    if (t < 0) {
                        t = 0;
                        b = gao;
                    }
                    if (r > wAll) {
                        r = wAll;
                        l = wAll - kuan;
                    }
                    if (b > hAll) {
                        b = hAll;
                        t = hAll - gao;
                    }

                    ivFore.layout(l, t, r, b);

                    lastX = (int) event.getRawX();
                    lastY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_UP://松开
                    ivFore.setForeground(null);
                    break;
            }
            return true;
        });

        /**
         * 设置图片布局方式
         * ImageView 有一个布局大小，加载到这个布局的图片也会有自己的宽高比例大小
         * 布局的大小和图片的大小是很难一致的，那么图片该如何显示呢？
         * 这时，我们可以通过 setScaleType 方法来加载设置图片布局（同 android:scaleType）
         */
        ivScaleType.setScaleType(ImageView.ScaleType.CENTER);
        /**
         * 可选值如下：
         * 1、MATRIX / matrix：用矩阵的方式绘制，从ImageView的左上角开始绘制原图，不缩放图片， 超过ImageView部分作裁剪处理；
         * 2、CENTER / center：保持原图的大小，显示在ImageView的中心。当原图的尺寸大于ImageView的尺寸，超过部分裁剪处理；
         * 3、CENTER_CROP / centerCrop：保持横纵比缩放图片，直到完全覆盖ImageView为止（指的是ImageView的宽和高都要填满），原图超过ImageView的部分作裁剪处理；
         * 4、CENTER_INSIDE / centerInside：将图片的内容完整居中显示，通过按比例缩小原图尺寸的宽高等于或小于ImageView的宽高。如果原图的尺寸本身就小于ImageView的尺寸，则原图的尺寸不作任何处理，居中显示在ImageView；
         * 5、FIT_XY / fitXY：把原图宽高进行不保持原比例放缩，直到填充满ImageView为止；
         * 6、FIT_START / fitStart：把原图按比例放缩使之等于ImageView的宽高，缩放完成后将图片放在ImageView的左上角；
         * 7、FIT_CENTER / fitCenter：把原图按比例放缩使之等于ImageView的宽高使之居中显示，缩放后放于中间；
         * 8、FIT_END / fitEnd：把原图按比例放缩到ImageView的宽高，缩放完成后将图片放在ImageView的右下角。
         */

    }

    @Override
    public void doBusiness(Context mContext) {

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // TODO: add setContentView(...) invocation
        ButterKnife.bind(this);
    }

    /**
     * 获得屏幕宽度
     *
     * @param context
     * @return
     */
    public static int getScreenWidth(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.widthPixels;
    }

    /**
     * 获得屏幕高度
     *
     * @param context
     * @return
     */
    public static int getScreenHeight(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.heightPixels;
    }
}

CircleImageView.java

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.support.annotation.ColorRes;
import android.support.annotation.DrawableRes;
import android.util.AttributeSet;
import android.widget.ImageView;

import com.self.control.R;

@SuppressLint("AppCompatCustomView")
public class CircleImageView extends ImageView {

    private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;

    private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;
    private static final int COLORDRAWABLE_DIMENSION = 2;

    private static final int DEFAULT_BORDER_WIDTH = 0;
    private static final int DEFAULT_BORDER_COLOR = Color.BLACK;
    private static final int DEFAULT_FILL_COLOR = Color.TRANSPARENT;
    private static final boolean DEFAULT_BORDER_OVERLAY = false;

    private final RectF mDrawableRect = new RectF();
    private final RectF mBorderRect = new RectF();

    private final Matrix mShaderMatrix = new Matrix();
    private final Paint mBitmapPaint = new Paint();
    private final Paint mBorderPaint = new Paint();
    private final Paint mFillPaint = new Paint();

    private int mBorderColor = DEFAULT_BORDER_COLOR;
    private int mBorderWidth = DEFAULT_BORDER_WIDTH;
    private int mFillColor = DEFAULT_FILL_COLOR;

    private Bitmap mBitmap;
    private BitmapShader mBitmapShader;
    private int mBitmapWidth;
    private int mBitmapHeight;

    private float mDrawableRadius;
    private float mBorderRadius;

    private ColorFilter mColorFilter;

    private boolean mReady;
    private boolean mSetupPending;
    private boolean mBorderOverlay;

    public CircleImageView(Context context) {
        super(context);

        init();
    }

    public CircleImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);

        mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_civ_border_width, DEFAULT_BORDER_WIDTH);
        mBorderColor = a.getColor(R.styleable.CircleImageView_civ_border_color, DEFAULT_BORDER_COLOR);
        mBorderOverlay = a.getBoolean(R.styleable.CircleImageView_civ_border_overlay, DEFAULT_BORDER_OVERLAY);
        mFillColor = a.getColor(R.styleable.CircleImageView_civ_fill_color, DEFAULT_FILL_COLOR);

        a.recycle();

        init();
    }

    private void init() {
        super.setScaleType(SCALE_TYPE);
        mReady = true;

        if (mSetupPending) {
            setup();
            mSetupPending = false;
        }
    }

    @Override
    public ScaleType getScaleType() {
        return SCALE_TYPE;
    }

    @Override
    public void setScaleType(ScaleType scaleType) {
        if (scaleType != SCALE_TYPE) {
            throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));
        }
    }

    @Override
    public void setAdjustViewBounds(boolean adjustViewBounds) {
        if (adjustViewBounds) {
            throw new IllegalArgumentException("adjustViewBounds not supported.");
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (mBitmap == null) {
            return;
        }

        if (mFillColor != Color.TRANSPARENT) {
            canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mDrawableRadius, mFillPaint);
        }
        canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mDrawableRadius, mBitmapPaint);
        if (mBorderWidth != 0) {
            canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mBorderRadius, mBorderPaint);
        }
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        setup();
    }

    public int getBorderColor() {
        return mBorderColor;
    }

    public void setBorderColor(int borderColor) {
        if (borderColor == mBorderColor) {
            return;
        }

        mBorderColor = borderColor;
        mBorderPaint.setColor(mBorderColor);
        invalidate();
    }

    public void setBorderColorResource(@ColorRes int borderColorRes) {
        setBorderColor(getContext().getResources().getColor(borderColorRes));
    }

    public int getFillColor() {
        return mFillColor;
    }

    public void setFillColor(int fillColor) {
        if (fillColor == mFillColor) {
            return;
        }

        mFillColor = fillColor;
        mFillPaint.setColor(fillColor);
        invalidate();
    }

    public void setFillColorResource(@ColorRes int fillColorRes) {
        setFillColor(getContext().getResources().getColor(fillColorRes));
    }

    public int getBorderWidth() {
        return mBorderWidth;
    }

    public void setBorderWidth(int borderWidth) {
        if (borderWidth == mBorderWidth) {
            return;
        }

        mBorderWidth = borderWidth;
        setup();
    }

    public boolean isBorderOverlay() {
        return mBorderOverlay;
    }

    public void setBorderOverlay(boolean borderOverlay) {
        if (borderOverlay == mBorderOverlay) {
            return;
        }

        mBorderOverlay = borderOverlay;
        setup();
    }

    @Override
    public void setImageBitmap(Bitmap bm) {
        super.setImageBitmap(bm);
        mBitmap = bm;
        setup();
    }

    @Override
    public void setImageDrawable(Drawable drawable) {
        super.setImageDrawable(drawable);
        mBitmap = getBitmapFromDrawable(drawable);
        setup();
    }

    @Override
    public void setImageResource(@DrawableRes int resId) {
        super.setImageResource(resId);
        mBitmap = getBitmapFromDrawable(getDrawable());
        setup();
    }

    @Override
    public void setImageURI(Uri uri) {
        super.setImageURI(uri);
        mBitmap = uri != null ? getBitmapFromDrawable(getDrawable()) : null;
        setup();
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        if (cf == mColorFilter) {
            return;
        }

        mColorFilter = cf;
        mBitmapPaint.setColorFilter(mColorFilter);
        invalidate();
    }

    private Bitmap getBitmapFromDrawable(Drawable drawable) {
        if (drawable == null) {
            return null;
        }

        if (drawable instanceof BitmapDrawable) {
            return ((BitmapDrawable) drawable).getBitmap();
        }

        try {
            Bitmap bitmap;

            if (drawable instanceof ColorDrawable) {
                bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);
            } else {
                bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);
            }

            Canvas canvas = new Canvas(bitmap);
            drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
            drawable.draw(canvas);
            return bitmap;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    private void setup() {
        if (!mReady) {
            mSetupPending = true;
            return;
        }

        if (getWidth() == 0 && getHeight() == 0) {
            return;
        }

        if (mBitmap == null) {
            invalidate();
            return;
        }

        mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

        mBitmapPaint.setAntiAlias(true);
        mBitmapPaint.setShader(mBitmapShader);

        mBorderPaint.setStyle(Paint.Style.STROKE);
        mBorderPaint.setAntiAlias(true);
        mBorderPaint.setColor(mBorderColor);
        mBorderPaint.setStrokeWidth(mBorderWidth);

        mFillPaint.setStyle(Paint.Style.FILL);
        mFillPaint.setAntiAlias(true);
        mFillPaint.setColor(mFillColor);

        mBitmapHeight = mBitmap.getHeight();
        mBitmapWidth = mBitmap.getWidth();

        mBorderRect.set(0, 0, getWidth(), getHeight());
        mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2.0f, (mBorderRect.width() - mBorderWidth) / 2.0f);

        mDrawableRect.set(mBorderRect);
        if (!mBorderOverlay) {
            mDrawableRect.inset(mBorderWidth, mBorderWidth);
        }
        mDrawableRadius = Math.min(mDrawableRect.height() / 2.0f, mDrawableRect.width() / 2.0f);

        updateShaderMatrix();
        invalidate();
    }

    private void updateShaderMatrix() {
        float scale;
        float dx = 0;
        float dy = 0;

        mShaderMatrix.set(null);

        if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {
            scale = mDrawableRect.height() / (float) mBitmapHeight;
            dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;
        } else {
            scale = mDrawableRect.width() / (float) mBitmapWidth;
            dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;
        }

        mShaderMatrix.setScale(scale, scale);
        mShaderMatrix.postTranslate((int) (dx + 0.5f) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);

        mBitmapShader.setLocalMatrix(mShaderMatrix);
    }
}

styleable.xml

styleable 放到 values 下面

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="CircleImageView">
        <attr name="civ_border_width" format="dimension" />
        <attr name="civ_border_color" format="color" />
        <attr name="civ_border_overlay" format="boolean" />
        <attr name="civ_fill_color" format="color" />
    </declare-styleable>
</resources>

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