編輯：關於Android編程
本文主要包括以下內容：
其中1,2是兩種不同方式處理圖片圓角的情況。3，是通過Matrix進行圖片縮放，旋轉等。4，是通過Matrix操作圖片的處理，包括去飽和，四角黑影，中心突出等。5，圖片加文字組合顯示。
如果暫時感覺這些看不懂：
先看看這兩篇：
Android自定義控件深入學習 Android生成隨機驗證碼
詳解Android自定義控件屬性TypedArray以及attrs
1、使用Xfermode設置圓角圖片
主要代碼
package com.example.customimage.view;
import com.example.customimage.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.View;
/**
* 自定義View，實現圓角，圓形等效果
*/
public class XfermodeImageView extends View
{
//類型
private int type;
private static final int TYPE_CIRCLE = 0; //圓形
private static final int TYPE_RECT = 1; //矩形圓角
//原始圖片
private Bitmap mSrc;
//矩形圓角的幅度
private int mRadius;
//控件的寬度
private int mWidth;
// 控件的高度
private int mHeight;
public XfermodeImageView(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public XfermodeImageView(Context context)
{
this(context, null);
}
/**
* 初始化一些自定義的參數
*
* @param context
* @param attrs
* @param defStyle
*/
public XfermodeImageView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
R.styleable.XfermodeImageView, defStyle, 0);
int n = a.getIndexCount();
for (int i = 0; i < n; i++)
{
int attr = a.getIndex(i);
switch (attr)
{
//原始圖片，在布局裡面獲取
case R.styleable.XfermodeImageView_src:
mSrc = BitmapFactory.decodeResource(getResources(),
a.getResourceId(attr, 0));
break;
//類型屬性選擇
case R.styleable.XfermodeImageView_type:
//自定義類型屬性，0是圓形，1是矩形圓角
type = a.getInt(attr, 0);// 默認為Circle
break;
//矩形圓角幅度的獲取，默認是10dp
case R.styleable.XfermodeImageView_borderRadius:
mRadius = a.getDimensionPixelSize(attr, (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f,
getResources().getDisplayMetrics()));
Log.i("Show", String.valueOf(mRadius));
break;
}
}
a.recycle();
}
/**
* 計算控件的高度和寬度
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// 設置寬度
int specMode = MeasureSpec.getMode(widthMeasureSpec);
int specSize = MeasureSpec.getSize(widthMeasureSpec);
//match_parent或者設置的精確值獲取
//MeasureSpec.EXACTLY
if (specMode == MeasureSpec.EXACTLY)
{
mWidth = specSize;
}
else
{
// 由圖片決定的寬
//getPaddingLeft(),getPaddingRight()這兩個值是控件屬性的向內偏移的距離值，所以的一起計算
//區別於layout_marginLeft,兩個控件的左間距值設置
int desireByImg = getPaddingLeft() + getPaddingRight()
+ mSrc.getWidth();
// wrap_content
if (specMode == MeasureSpec.AT_MOST)
{
//所以最小的值，寬度的話是左右內偏移距離之和
mWidth = Math.min(desireByImg, specSize);
} else
mWidth = desireByImg;
}
// 設置高度，部分解釋同上
specMode = MeasureSpec.getMode(heightMeasureSpec);
specSize = MeasureSpec.getSize(heightMeasureSpec);
//match_parent或者設置的精確值獲取
//MeasureSpec.EXACTLY
if (specMode == MeasureSpec.EXACTLY)
{
mHeight = specSize;
} else
{
int desire = getPaddingTop() + getPaddingBottom()
+ mSrc.getHeight();
// wrap_content
if (specMode == MeasureSpec.AT_MOST)
{
mHeight = Math.min(desire, specSize);
} else
mHeight = desire;
}
//計算好的寬度以及高度是值，設置進去
setMeasuredDimension(mWidth, mHeight);
}
/**
* 繪制image控件
*/
@Override
protected void onDraw(Canvas canvas)
{
switch (type)
{
// 如果是TYPE_CIRCLE繪制圓形
case TYPE_CIRCLE:
//圓形寬度和高度應該一致的，所以也要比較一下大小，取小的值
int min = Math.min(mWidth, mHeight);
// 圓形寬度和高度如果不一致，按小的值進行壓縮
mSrc = Bitmap.createScaledBitmap(mSrc, min, min, false);
//繪制圓形
canvas.drawBitmap(createCircleImage(mSrc, min), 0, 0, null);
break;
case TYPE_RECT:
canvas.drawBitmap(createRoundConerImage(mSrc), 0, 0, null);
break;
}
}
/**
* 根據原圖和變長繪制圓形圖片
*
* @param source
* @param min
* @return
*/
private Bitmap createCircleImage(Bitmap source, int min)
{
final Paint paint = new Paint();
//防止邊緣的抗鋸齒
paint.setAntiAlias(true);
Bitmap target = Bitmap.createBitmap(min, min, Config.ARGB_8888);
// 產生一個同樣大小的畫布
Canvas canvas = new Canvas(target);
// 首先繪制圓形,除以2就是半徑了
//最主要設置第三個參數為min/2，圓角幅度那麼大就是圓形了
canvas.drawCircle(min / 2, min / 2, min/2, paint);
// 使用SRC_IN，參考上面的說明---上下層都顯示。下層居上顯示
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
// 繪制圖片
canvas.drawBitmap(source, 0, 0, paint);
return target;
}
/**
* 根據原圖添加圓角
*
* @param source
* @return
*/
private Bitmap createRoundConerImage(Bitmap source)
{
final Paint paint = new Paint();
paint.setAntiAlias(true);
Bitmap target = Bitmap.createBitmap(mWidth, mHeight, Config.ARGB_8888);
Canvas canvas = new Canvas(target);
//繪制矩形
RectF rect = new RectF(0, 0, source.getWidth(), source.getHeight());
//設置圓角幅度
canvas.drawRoundRect(rect, mRadius, mRadius, paint);
// 使用SRC_IN，參考上面的說明---上下層都顯示。下層居上顯示
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(source, 0, 0, paint);
return target;
}
}
2、使用BitmapShader設置圓角圖片
package com.example.customimage.view;
import com.example.customimage.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.widget.ImageView;
/**
*
*/
public class BitmapShaderImageView extends ImageView
{
// 圖片的類型，圓形or圓角
private int type;
public static final int TYPE_CIRCLE = 0;
public static final int TYPE_RECT = 1;
//圓角大小的默認值
private static final int BODER_RADIUS_DEFAULT = 10;
//圓角的大小
private int mBorderRadius;
// 繪圖的Paint
private Paint mBitmapPaint;
//圓角的半徑
private int mRadius;
// 3x3 矩陣，主要用於縮小放大
private Matrix mMatrix;
// 渲染圖像，使用圖像為繪制圖形著色
private BitmapShader mBitmapShader;
// view的寬度
private int mWidth;
//矩形
private RectF mRoundRect;
public BitmapShaderImageView(Context context)
{
this(context, null);
}
public BitmapShaderImageView(Context context, AttributeSet attrs)
{
super(context, attrs);
mMatrix = new Matrix();
mBitmapPaint = new Paint();
mBitmapPaint.setAntiAlias(true);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.BitmapShaderImageView);
//矩形圓角幅度的獲取，默認是10dp
mBorderRadius = a.getDimensionPixelSize(
R.styleable.BitmapShaderImageView_borderRadius, (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
BODER_RADIUS_DEFAULT, getResources()
.getDisplayMetrics()));
//自定義類型屬性，0是圓形，1是矩形圓角
type = a.getInt(R.styleable.BitmapShaderImageView_type, TYPE_CIRCLE);
a.recycle();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// 如果類型是圓形，則強制改變view的寬高一致，以小值為准
if (type == TYPE_CIRCLE)
{
mWidth = Math.min(getMeasuredWidth(), getMeasuredHeight());
//圓形的半徑
mRadius = mWidth / 2;
setMeasuredDimension(mWidth, mWidth);
}
}
// 初始化BitmapShader,獲取到圖片資源
// 等待畫布的准備好，然後在畫布上加上Paint就是了
//就是說圖片的載體是Paint
private void setUpShader()
{
Drawable drawable = getDrawable();
if (drawable == null)
{
return;
}
Bitmap bmp = drawableToBitamp(drawable);
// 將bmp作為著色器，就是在指定區域內繪制bmp
//TileMode.CLAMP 拉伸
mBitmapShader = new BitmapShader(bmp, TileMode.CLAMP, TileMode.CLAMP);
float scale = 1.0f;
if (type == TYPE_CIRCLE)
{
// 拿到bitmap寬或高的小值
int bSize = Math.min(bmp.getWidth(), bmp.getHeight());
scale = mWidth * 1.0f / bSize;
} else if (type == TYPE_RECT)
{
if (!(bmp.getWidth() == getWidth() && bmp.getHeight() == getHeight()))
{
// 如果圖片的寬或者高與view的寬高不匹配，計算出需要縮放的比例；縮放後的圖片的寬高，一定要大於我們view的寬高；所以我們這裡取大值；
scale = Math.max(getWidth() * 1.0f / bmp.getWidth(),
getHeight() * 1.0f / bmp.getHeight());
}
}
// shader的變換矩陣，我們這裡主要用於放大或者縮小
// scale * scale 的矩陣
mMatrix.setScale(scale, scale);
// 設置變換矩陣
mBitmapShader.setLocalMatrix(mMatrix);
// 設置shader
mBitmapPaint.setShader(mBitmapShader);
}
@Override
protected void onDraw(Canvas canvas)
{
if (getDrawable() == null)
{
return;
}
setUpShader();
if (type == TYPE_RECT)
{
//繪制矩形
canvas.drawRoundRect(mRoundRect, mBorderRadius, mBorderRadius,
mBitmapPaint);
} else
{
//繪制圓形
canvas.drawCircle(mRadius, mRadius, mRadius, mBitmapPaint);
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
super.onSizeChanged(w, h, oldw, oldh);
// 圓角圖片的范圍
if (type == TYPE_RECT)
mRoundRect = new RectF(0, 0, w, h);
}
//drawable轉bitmap
private Bitmap drawableToBitamp(Drawable drawable)
{
//從控件的src獲取背景，也是drawable文件獲取
if (drawable instanceof BitmapDrawable)
{
BitmapDrawable bd = (BitmapDrawable) drawable;
return bd.getBitmap();
}
//如果沒有繪圖一個，只不過是空白的圖片
int w = drawable.getIntrinsicWidth();
int h = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, w, h);
drawable.draw(canvas);
return bitmap;
}
private static final String STATE_INSTANCE = "state_instance";
private static final String STATE_TYPE = "state_type";
private static final String STATE_BORDER_RADIUS = "state_border_radius";
//屏幕旋轉後，取出保存的值
@Override
protected Parcelable onSaveInstanceState()
{
Bundle bundle = new Bundle();
bundle.putParcelable(STATE_INSTANCE, super.onSaveInstanceState());
bundle.putInt(STATE_TYPE, type);
bundle.putInt(STATE_BORDER_RADIUS, mBorderRadius);
return bundle;
}
//屏幕旋轉，變量的保存，因為外面設置值，如果不保存，一旋轉就變成個xml裡面設置的值
@Override
protected void onRestoreInstanceState(Parcelable state)
{
if (state instanceof Bundle)
{
Bundle bundle = (Bundle) state;
super.onRestoreInstanceState(((Bundle) state)
.getParcelable(STATE_INSTANCE));
this.type = bundle.getInt(STATE_TYPE);
this.mBorderRadius = bundle.getInt(STATE_BORDER_RADIUS);
} else
{
super.onRestoreInstanceState(state);
}
}
//設置矩形圓角幅度後，重新繪制控件
public void setBorderRadius(int borderRadius)
{
int pxVal = dp2px(borderRadius);
if (this.mBorderRadius != pxVal)
{
this.mBorderRadius = pxVal;
invalidate();
}
}
//設置是圓形還是矩形圓角
public void setType(int type)
{
if (this.type != type)
{
this.type = type;
if (this.type != TYPE_RECT && this.type != TYPE_CIRCLE)
{
this.type = TYPE_CIRCLE;
}
requestLayout();
}
}
//dp轉px
public int dp2px(int dpVal)
{
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
dpVal, getResources().getDisplayMetrics());
}
}
3、滑動旋轉縮放的bimp圖片
package com.example.customimage.view;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.PointF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ImageView;
public class MatrixImageView extends ImageView {
private static final int MODE_NONE = 0x00123;// 默認的觸摸模式
private static final int MODE_DRAG = 0x00321;// 拖拽模式
private static final int MODE_ZOOM = 0x00132;// 縮放or旋轉模式
private int mode;// 當前的觸摸模式
private float preMove = 1F;// 上一次手指移動的距離
private float saveRotate = 0F;// 保存了的角度值
private float rotate = 0F;// 旋轉的角度
private float[] preEventCoor;// 上一次各觸摸點的坐標集合
private PointF startPointF, midPointF;// 起點、中點對象
private Matrix currentMatrix, savedMatrix;// 當前和保存了的Matrix對象
//原始圖片
private Bitmap mSrc;
//控件的寬度
private int mWidth;
// 控件的高度
private int mHeight;
private PaintFlagsDrawFilter mDrawFilter;
public MatrixImageView(Context context, AttributeSet attrs) {
super(context, attrs);
// 初始化
init();
}
/**
* 初始化
*/
private void init() {
// 實例化對象
currentMatrix = new Matrix();
savedMatrix = new Matrix();
startPointF = new PointF();
midPointF = new PointF();
mDrawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);
// 模式初始化
mode = MODE_NONE;
Drawable drawable = getDrawable();
mSrc = drawableToBitamp(drawable);
}
/**
* 計算控件的高度和寬度
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// 設置寬度
int specMode = MeasureSpec.getMode(widthMeasureSpec);
int specSize = MeasureSpec.getSize(widthMeasureSpec);
//match_parent或者設置的精確值獲取
//MeasureSpec.EXACTLY
if (specMode == MeasureSpec.EXACTLY)
{
mWidth = specSize;
}
else
{
// 由圖片決定的寬
//getPaddingLeft(),getPaddingRight()這兩個值是控件屬性的向內偏移的距離值，所以的一起計算
//區別於layout_marginLeft,兩個控件的左間距值設置
int desireByImg = getPaddingLeft() + getPaddingRight()
+ mSrc.getWidth();
// wrap_content
if (specMode == MeasureSpec.AT_MOST)
{
//所以最小的值，寬度的話是左右內偏移距離之和
mWidth = Math.min(desireByImg, specSize);
} else
mWidth = desireByImg;
}
// 設置高度，部分解釋同上
specMode = MeasureSpec.getMode(heightMeasureSpec);
specSize = MeasureSpec.getSize(heightMeasureSpec);
//match_parent或者設置的精確值獲取
//MeasureSpec.EXACTLY
if (specMode == MeasureSpec.EXACTLY)
{
mHeight = specSize;
} else
{
int desire = getPaddingTop() + getPaddingBottom()
+ mSrc.getHeight();
// wrap_content
if (specMode == MeasureSpec.AT_MOST)
{
mHeight = Math.min(desire, specSize);
} else
mHeight = desire;
}
//計算好的寬度以及高度是值，設置進去
setMeasuredDimension(mWidth, mHeight);
}
//drawable轉bitmap
private Bitmap drawableToBitamp(Drawable drawable)
{
//從控件的src獲取背景，也是drawable文件獲取
if (drawable instanceof BitmapDrawable)
{
BitmapDrawable bd = (BitmapDrawable) drawable;
return bd.getBitmap();
}
//如果沒有繪圖一個，只不過是空白的圖片
int w = drawable.getIntrinsicWidth();
int h = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, w, h);
drawable.draw(canvas);
return bitmap;
}
final Paint paint = new Paint();
@Override
protected void onDraw(Canvas canvas) {
//消除鋸齒, 圖片旋轉後的鋸齒消除不成功，實在不行圖片邊緣加一些白色像素點
canvas.setDrawFilter(mDrawFilter);
//畫經過Matrix變化後的圖
canvas.drawBitmap(mSrc, currentMatrix, null);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:// 單點接觸屏幕時
savedMatrix.set(currentMatrix);
startPointF.set(event.getX(), event.getY());
//單點觸摸是移動模式
mode = MODE_DRAG;
preEventCoor = null;
break;
case MotionEvent.ACTION_POINTER_DOWN:// 第二個點接觸屏幕時
preMove = calSpacing(event);
if (preMove > 10F) {
savedMatrix.set(currentMatrix);
// 計算兩個觸摸點的中點坐標
calMidPoint(midPointF, event);
//兩點是旋轉或者縮放模式
mode = MODE_ZOOM;
}
preEventCoor = new float[4];
preEventCoor[0] = event.getX(0);
preEventCoor[1] = event.getX(1);
preEventCoor[2] = event.getY(0);
preEventCoor[3] = event.getY(1);
saveRotate = calRotation(event);
break;
case MotionEvent.ACTION_UP:// 單點離開屏幕時
case MotionEvent.ACTION_POINTER_UP:// 第二個點離開屏幕時
mode = MODE_NONE;
preEventCoor = null;
break;
case MotionEvent.ACTION_MOVE:// 觸摸點移動時
/*
* 單點觸控拖拽平移
*/
if (mode == MODE_DRAG) {
currentMatrix.set(savedMatrix);
float dx = event.getX() - startPointF.x;
float dy = event.getY() - startPointF.y;
currentMatrix.postTranslate(dx, dy);
}
/*
* 兩點觸控拖放旋轉
*/
else if (mode == MODE_ZOOM && event.getPointerCount() == 2) {
float currentMove = calSpacing(event);
currentMatrix.set(savedMatrix);
/*
* 指尖移動距離大於10F縮放
*/
if (currentMove > 10F) {
float scale = currentMove / preMove;
currentMatrix.postScale(scale, scale, midPointF.x, midPointF.y);
}
/*
* 保持兩點時旋轉
*/
if (preEventCoor != null) {
rotate = calRotation(event);
r = rotate - saveRotate;
currentMatrix.postRotate(r, getMeasuredWidth() / 2, getMeasuredHeight() / 2);
}
}
break;
}
setImageMatrix(currentMatrix);
return true;
}
float r;
/**
* 計算兩個觸摸點間的距離
*/
private float calSpacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (float) Math.sqrt(x * x + y * y);
}
/**
* 計算兩個觸摸點的中點坐標
*/
private void calMidPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
/**
* 計算旋轉角度
*
* @param 事件對象
* @return 角度值
*/
private float calRotation(MotionEvent event) {
double deltaX = (event.getX(0) - event.getX(1));
double deltaY = (event.getY(0) - event.getY(1));
double radius = Math.atan2(deltaY, deltaX);
return (float) Math.toDegrees(radius);
}
}
4、圖片顏色處理（滑動)
package com.example.customimage.view;
import com.example.customimage.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.RadialGradient;
import android.graphics.Shader.TileMode;
import android.util.AttributeSet;
import android.view.View;
public class DreamEffectView extends View {
private Paint mBitmapPaint, mShaderPaint;// 位圖畫筆和Shader圖形的畫筆
private PorterDuffXfermode mXfermode;// 圖形混合模式
private int x, y;// 位圖起點坐標
//控件的寬度
private int mWidth;
// 控件的高度
private int mHeight;
//原始圖片
private Bitmap mSrc;
//生成暗角的圖片
private Bitmap darkCornerBitmap;
public final static int BITMAP_NULL = 0; //原圖
private final static int BITMAP_DEAST = 1; //去飽和
private final static int BITMAP_CENTER = 2; //中心突出
private final static int BITMAP_DARKCORNER = 3; //四角黑暗
private int mnSelectMode = 0;
public DreamEffectView(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public DreamEffectView(Context context)
{
this(context, null);
}
public DreamEffectView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs,defStyle);
TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
R.styleable.DreamEffectView, defStyle, 0);
int n = a.getIndexCount();
for (int i = 0; i < n; i++)
{
int attr = a.getIndex(i);
switch (attr)
{
//原始圖片，在布局裡面獲取
case R.styleable.DreamEffectView_src:
mSrc = BitmapFactory.decodeResource(getResources(),
a.getResourceId(attr, 0));
break;
case R.styleable.DreamEffectView_mode:
mnSelectMode = a.getInt(attr, 0);
break;
}
}
a.recycle();
// 實例化混合模式
mXfermode = new PorterDuffXfermode(Mode.SCREEN);
// 初始化畫筆
initPaint();
}
/**
* 計算控件的高度和寬度
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// 設置寬度
int specMode = MeasureSpec.getMode(widthMeasureSpec);
int specSize = MeasureSpec.getSize(widthMeasureSpec);
if (specMode == MeasureSpec.EXACTLY)
{
mWidth = specSize;
}
else
{
int desireByImg = getPaddingLeft() + getPaddingRight()
+ mSrc.getWidth();
// wrap_content
if (specMode == MeasureSpec.AT_MOST)
{
//所以最小的值，寬度的話是左右內偏移距離之和
mWidth = Math.min(desireByImg, specSize);
} else
mWidth = desireByImg;
}
// 設置高度，部分解釋同上
specMode = MeasureSpec.getMode(heightMeasureSpec);
specSize = MeasureSpec.getSize(heightMeasureSpec);
if (specMode == MeasureSpec.EXACTLY)
{
mHeight = specSize;
} else
{
int desire = getPaddingTop() + getPaddingBottom()
+ mSrc.getHeight();
// wrap_content
if (specMode == MeasureSpec.AT_MOST)
{
mHeight = Math.min(desire, specSize);
} else
mHeight = desire;
}
x = mWidth / 2 - mSrc.getWidth() / 2;
y = mHeight / 2 - mSrc.getHeight() / 2;
//計算好的寬度以及高度是值，設置進去
setMeasuredDimension(mWidth, mHeight);
}
/**
* 初始化畫筆
*/
private void initPaint() {
// 實例化畫筆
mBitmapPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
// 實例化Shader圖形的畫筆
mShaderPaint = new Paint();
switch (mnSelectMode) {
case BITMAP_NULL:
break;
case BITMAP_DEAST:
// 去飽和、提亮、色相矯正
mBitmapPaint.setColorFilter(new ColorMatrixColorFilter(
new float[] { 0.8587F, 0.2940F, -0.0927F, 0, 6.79F, 0.0821F, 0.9145F, 0.0634F, 0, 6.79F,
0.2019F, 0.1097F, 0.7483F, 0, 6.79F, 0, 0, 0, 1, 0 }));
break;
case BITMAP_CENTER:
// 去飽和、提亮、色相矯正
mBitmapPaint.setColorFilter(new ColorMatrixColorFilter(
new float[] { 0.8587F, 0.2940F, -0.0927F, 0, 6.79F, 0.0821F, 0.9145F, 0.0634F, 0, 6.79F,
0.2019F, 0.1097F, 0.7483F, 0, 6.79F, 0, 0, 0, 1, 0 }));
// 設置徑向漸變，漸變中心當然是圖片的中心也是屏幕中心，漸變半徑我們直接拿圖片的高度但是要稍微小一點
// 中心顏色為透明而邊緣顏色為黑色
mShaderPaint.setShader(new RadialGradient(mWidth / 2, mWidth / 2, mSrc.getHeight() * 7 / 8, Color.TRANSPARENT,
Color.BLACK, TileMode.CLAMP));
break;
case BITMAP_DARKCORNER:
// 去飽和、提亮、色相矯正
mBitmapPaint.setColorFilter(new ColorMatrixColorFilter(
new float[] { 0.8587F, 0.2940F, -0.0927F, 0, 6.79F, 0.0821F, 0.9145F, 0.0634F, 0, 6.79F,
0.2019F, 0.1097F, 0.7483F, 0, 6.79F, 0, 0, 0, 1, 0 }));
// 根據我們源圖的大小生成暗角Bitmap
darkCornerBitmap = Bitmap.createBitmap(mSrc.getWidth(), mSrc.getHeight(), Bitmap.Config.ARGB_8888);
// 將該暗角Bitmap注入Canvas
Canvas canvas = new Canvas(darkCornerBitmap);
// 計算徑向漸變半徑
float radiu = canvas.getHeight() * (2F / 3F);
// 實例化徑向漸變
RadialGradient radialGradient = new RadialGradient(canvas.getWidth() / 2F, canvas.getHeight() / 2F, radiu, new int[] { 0, 0, 0xAA000000 }, new float[] { 0F, 0.7F, 1.0F }, TileMode.CLAMP);
// 實例化一個矩陣
Matrix matrix = new Matrix();
// 設置矩陣的縮放
matrix.setScale(canvas.getWidth() / (radiu * 2F), 1.0F);
// 設置矩陣的預平移
matrix.preTranslate(((radiu * 2F) - canvas.getWidth()) / 2F, 0);
// 將該矩陣注入徑向漸變
radialGradient.setLocalMatrix(matrix);
// 設置畫筆Shader
mShaderPaint.setShader(radialGradient);
// 繪制矩形
canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(), mShaderPaint);
break;
default:
break;
}
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.BLACK);
// 新建圖層
int sc = canvas.saveLayer(x, y, x + mSrc.getWidth(), y + mSrc.getHeight(), null, Canvas.ALL_SAVE_FLAG);
// 繪制混合顏色
canvas.drawColor(0xcc1c093e);
// 設置混合模式
mBitmapPaint.setXfermode(mXfermode);
// 繪制位圖
canvas.drawBitmap(mSrc, x, y, mBitmapPaint);
// 還原混合模式
mBitmapPaint.setXfermode(null);
// 還原畫布
canvas.restoreToCount(sc);
switch (mnSelectMode) {
case BITMAP_NULL:
break;
case BITMAP_DEAST:
break;
case BITMAP_CENTER:
// 繪制一個跟圖片大小一樣的矩形
canvas.drawRect(x, y, x + mSrc.getWidth(), y + mSrc.getHeight(),mShaderPaint);
break;
case BITMAP_DARKCORNER:
// 繪制我們畫好的徑向漸變圖
canvas.drawBitmap(darkCornerBitmap, x, y, null);
break;
default:
break;
}
}
}
1）、實現 去飽和、提亮、色相矯正 效果的部分代碼
mBitmapPaint.setColorFilter(new ColorMatrixColorFilter(
new float[] { 0.8587F, 0.2940F, -0.0927F, 0, 6.79F, 0.0821F, 0.9145F, 0.0634F, 0, 6.79F,
0.2019F, 0.1097F, 0.7483F, 0, 6.79F, 0, 0, 0, 1, 0 }));
2）、實現中心顏色為透明而邊緣顏色為黑色效果的部分代碼
mShaderPaint.setShader(new RadialGradient(mWidth / 2, mWidth / 2, mSrc.getHeight() * 7 / 8, Color.TRANSPARENT, Color.BLACK, TileMode.CLAMP));
3）、實現四角黑暗效果的部分代碼
// 根據我們源圖的大小生成暗角Bitmap
darkCornerBitmap = Bitmap.createBitmap(mSrc.getWidth(), mSrc.getHeight(), Bitmap.Config.ARGB_8888);
// 將該暗角Bitmap注入Canvas
Canvas canvas = new Canvas(darkCornerBitmap);
// 計算徑向漸變半徑
float radiu = canvas.getHeight() * (2F / 3F);
// 實例化徑向漸變
RadialGradient radialGradient = new RadialGradient(canvas.getWidth() / 2F, canvas.getHeight() / 2F, radiu, new int[] { 0, 0, 0xAA000000 }, new float[] { 0F, 0.7F, 1.0F }, TileMode.CLAMP);
// 實例化一個矩陣
Matrix matrix = new Matrix();
// 設置矩陣的縮放
matrix.setScale(canvas.getWidth() / (radiu * 2F), 1.0F);
// 設置矩陣的預平移
matrix.preTranslate(((radiu * 2F) - canvas.getWidth()) / 2F, 0);
// 將該矩陣注入徑向漸變
radialGradient.setLocalMatrix(matrix);
// 設置畫筆Shader
mShaderPaint.setShader(radialGradient);
// 繪制矩形
canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(), mShaderPaint);
5、圖片 + 文字
package com.example.customimage.view;
import com.example.customimage.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.graphics.Bitmap.Config;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.text.TextPaint;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.View;
public class ImageViewText extends View{
//類型
private int type;
private static final int TYPE_CIRCLE = 0; //圓形
private static final int TYPE_RECT = 1; //矩形圓角
//原始圖片
private Bitmap mImage;
//控件的寬度
private int mWidth;
// 控件的高度
private int mHeight;
//矩形圓角的幅度
private int mRadius;
//圖片下面的文字
private String mTitle;
private int mTextColor;
private int mTextSize;
private Rect rect;
private Paint mPaint;
private Rect mTextBound;
public ImageViewText(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public ImageViewText(Context context)
{
this(context, null);
}
/**
* 初始化所特有自定義類型
*
* @param context
* @param attrs
* @param defStyle
*/
public ImageViewText(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.ImageViewText, defStyle, 0);
int n = a.getIndexCount();
for (int i = 0; i < n; i++)
{
int attr = a.getIndex(i);
switch (attr)
{
//獲取圖片
case R.styleable.ImageViewText_image:
mImage = BitmapFactory.decodeResource(getResources(), a.getResourceId(attr, 0));
break;
//獲取圓形還是方形
case R.styleable.ImageViewText_type:
type = a.getInt(attr, 0);
break;
//獲取文字
case R.styleable.ImageViewText_titleText:
mTitle = a.getString(attr);
break;
//獲取文字的圖片
case R.styleable.ImageViewText_titleTextColor:
mTextColor = a.getColor(attr, Color.BLACK);
break;
//獲取文字的大小
case R.styleable.ImageViewText_titleTextSize:
mTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
16, getResources().getDisplayMetrics()));
break;
//矩形圓角幅度的獲取，默認是10dp
case R.styleable.ImageViewText_borderRadius:
mRadius = a.getDimensionPixelSize(attr, (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f,
getResources().getDisplayMetrics()));
break;
}
}
a.recycle();
rect = new Rect();
mPaint = new Paint();
mTextBound = new Rect();
mPaint.setTextSize(mTextSize);
// 計算了描繪字體需要的范圍
mPaint.getTextBounds(mTitle, 0, mTitle.length(), mTextBound);
}
//測量控件的大小
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
//設置寬度
int specMode = MeasureSpec.getMode(widthMeasureSpec);
int specSize = MeasureSpec.getSize(widthMeasureSpec);
// match_parent , accurate 大小
if (specMode == MeasureSpec.EXACTLY)
{
mWidth = specSize;
} else
{
// 由圖片決定的寬
int desireByImg = getPaddingLeft() + getPaddingRight() + mImage.getWidth();
// 由字體決定的寬
int desireByTitle = getPaddingLeft() + getPaddingRight() + mTextBound.width();
//wrap_content 大小
if (specMode == MeasureSpec.AT_MOST)
{
//取小的值
int desire = Math.max(desireByImg, desireByTitle);
mWidth = Math.min(desire, specSize);
}
}
//設置高度
specMode = MeasureSpec.getMode(heightMeasureSpec);
// match_parent , accurate 大小
if (specMode == MeasureSpec.EXACTLY)
{
mHeight = specSize;
} else
{
//wrap_content 大小
mHeight = getPaddingTop() + getPaddingBottom() + mImage.getHeight() + mTextBound.height();
}
//測量好的大小設置進去
setMeasuredDimension(mWidth, mHeight);
}
@Override
protected void onDraw(Canvas canvas)
{
// 邊框
mPaint.setStrokeWidth(4);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setColor(Color.CYAN);
canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint);
mPaint.setColor(mTextColor);
mPaint.setStyle(Style.FILL);
//當前設置的寬度小於字體需要的寬度，將字體改為
//繪制文字
if (mTextBound.width() > mWidth)
{
TextPaint paint = new TextPaint(mPaint);
String msg = TextUtils.ellipsize(mTitle, paint, (float) mWidth - getPaddingLeft() - getPaddingRight(),
TextUtils.TruncateAt.END).toString();
canvas.drawText(msg, getPaddingLeft(), mHeight - getPaddingBottom(), mPaint);
} else
{
//正常情況，將字體居中
canvas.drawText(mTitle, mWidth / 2 - mTextBound.width() * 1.0f / 2, mHeight - getPaddingBottom(), mPaint);
}
//計算居中的矩形范圍
rect.left = mWidth / 2 - mImage.getWidth() / 2 + getPaddingLeft();
rect.right = mWidth / 2 + mImage.getWidth() / 2 + getPaddingRight();
rect.top = (mHeight - mTextBound.height()) / 2 - mImage.getHeight() / 2 + getPaddingTop();
rect.bottom = (mHeight - mTextBound.height()) / 2 + mImage.getHeight() / 2 + getPaddingBottom();
switch (type)
{
// 如果是TYPE_CIRCLE繪制圓形
case TYPE_CIRCLE:
//圓形寬度和高度應該一致的，所以也要比較一下大小，取小的值
int min = Math.min(mWidth, mHeight);
// 圓形寬度和高度如果不一致，按小的值進行壓縮
mImage = Bitmap.createScaledBitmap(mImage, min, min, false);
//繪制圓形
canvas.drawBitmap(createCircleImage(mImage, min), null, rect, null);
break;
case TYPE_RECT:
canvas.drawBitmap(createRoundConerImage(mImage), null, rect, null);
break;
}
}
/**
* 根據原圖和變長繪制圓形圖片
*
* @param source
* @param min
* @return
*/
private Bitmap createCircleImage(Bitmap source, int min)
{
final Paint paint = new Paint();
//防止邊緣的抗鋸齒
paint.setAntiAlias(true);
Bitmap target = Bitmap.createBitmap(min, min, Config.ARGB_8888);
// 產生一個同樣大小的畫布
Canvas canvas = new Canvas(target);
// 首先繪制圓形,除以2就是半徑了
//最主要設置第三個參數為min/2，圓角幅度那麼大就是圓形了
canvas.drawCircle(min / 2, min / 2, min/2, paint);
// 使用SRC_IN，參考上面的說明---上下層都顯示。下層居上顯示
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
// 繪制圖片
canvas.drawBitmap(source, 0, 0, paint);
return target;
}
/**
* 根據原圖添加圓角
*
* @param source
* @return
*/
private Bitmap createRoundConerImage(Bitmap source)
{
final Paint paint = new Paint();
paint.setAntiAlias(true);
Bitmap target = Bitmap.createBitmap(mWidth, mHeight, Config.ARGB_8888);
Canvas canvas = new Canvas(target);
//繪制矩形
RectF rect = new RectF(0, 0, source.getWidth(), source.getHeight());
//設置圓角幅度
canvas.drawRoundRect(rect, mRadius, mRadius, paint);
// 使用SRC_IN，參考上面的說明---上下層都顯示。下層居上顯示
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(source, 0, 0, paint);
return target;
}
}
是不是很全的Android自定義圖片集合，希望大家喜歡。
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