Android項(xiàng)目開(kāi)發(fā)中經(jīng)常會(huì)遇見(jiàn)需要實(shí)現(xiàn)圓角或者圓形的圖片功能，如果僅僅使用系統(tǒng)自帶的ImageView控件顯然無(wú)法實(shí)現(xiàn)此功能，所以通過(guò)系列文章的形式由簡(jiǎn)到繁全方位的介紹一下此功能的實(shí)現(xiàn)，鞏固一下自身的學(xué)習(xí)，同時(shí)，和廣大網(wǎng)友交流分享
本項(xiàng)目源碼下載地址：鏈接：http://pan.baidu.com/s/1sljdvtF 密碼：xj85
首先看效果圖
首先看一下CircleImageView的主要流程
1. 首先通過(guò)setImageXxx()方法設(shè)置圖片Bitmap；
2. 進(jìn)入構(gòu)造函數(shù)CircleImageView()獲取自定義參數(shù)，以及調(diào)用setup()函數(shù)；
3. 進(jìn)入setup()函數(shù)（非常關(guān)鍵），進(jìn)行圖片畫(huà)筆邊界畫(huà)筆(Paint)一些重繪參數(shù)初始化：構(gòu)建渲染器BitmapShader用Bitmap來(lái)填充繪制區(qū)域,設(shè)置樣式和內(nèi)外圓半徑計(jì)算等，以及調(diào)用updateShaderMatrix()函數(shù)和 invalidate()函數(shù)；
4. 進(jìn)入updateShaderMatrix()函數(shù)，計(jì)算縮放比例和平移，設(shè)置BitmapShader的Matrix參數(shù)等；
5. 觸發(fā)ondraw()函數(shù)完成最終的繪制。使用配置好的Paint先畫(huà)出繪制內(nèi)圓形來(lái)以后再畫(huà)邊界圓形。
下面看具體的代碼實(shí)現(xiàn)：
attr.xml
<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="roundedimageview"> <attr name="border_thickness" format="dimension" /> <attr name="border_inside_color" format="color" /> <attr name="border_outside_color" format="color"></attr> </declare-styleable></resources>
然后是自定義ImageView的實(shí)現(xiàn)類：
RoundImageView.class
**
* 圓形ImageView，可設(shè)置最多兩個(gè)寬度不同且顏色不同的圓形邊框。 * 設(shè)置顏色在xml布局文件中由自定義屬性配置參數(shù)指定 */public class RoundImageView extends ImageView { private int mBorderThickness = 0; private Context mContext; private int defaultColor = 0xFFFFFFFF; // 如果只有其中一個(gè)有值，則只畫(huà)一個(gè)圓形邊框
private int mBorderOutsideColor = 0; private int mBorderInsideColor = 0; // 控件默認(rèn)長(zhǎng)、寬
private int defaultWidth = 0; private int defaultHeight = 0;//構(gòu)造方法，參數(shù)上下文
public RoundImageView(Context context) { super(context);
mContext = context;
} public RoundImageView(Context context, AttributeSet attrs) { super(context, attrs);
mContext = context;
setCustomAttributes(attrs);
} public RoundImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle);
mContext = context;
setCustomAttributes(attrs);
} private void setCustomAttributes(AttributeSet attrs) {
TypedArray a = mContext.obtainStyledAttributes(attrs, R.styleable.roundedimageview);
mBorderThickness = a.getDimensionPixelSize(R.styleable.roundedimageview_border_thickness, 0);
mBorderOutsideColor = a.getColor(R.styleable.roundedimageview_border_outside_color, defaultColor);
mBorderInsideColor = a.getColor(R.styleable.roundedimageview_border_inside_color, defaultColor);
}
@Override protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable(); if (drawable == null) { return;
} if (getWidth() == 0 || getHeight() == 0) { return;
} this.measure(0, 0); if (drawable.getClass() == NinePatchDrawable.class) return;
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true); if (defaultWidth == 0) {
defaultWidth = getWidth();
} if (defaultHeight == 0) {
defaultHeight = getHeight();
} int radius = 0; if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {// 定義畫(huà)兩個(gè)邊框，分別為外圓邊框和內(nèi)圓邊框
radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness; // 畫(huà)內(nèi)圓
drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor); // 畫(huà)外圓
drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / 2, mBorderOutsideColor);
} else if (mBorderInsideColor != defaultColor && mBorderOutsideColor == defaultColor) {// 定義畫(huà)一個(gè)邊框
radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;
drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor);
} else if (mBorderInsideColor == defaultColor && mBorderOutsideColor != defaultColor) {// 定義畫(huà)一個(gè)邊框
radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;
drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderOutsideColor);
} else {// 沒(méi)有邊框
radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2;
}
Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);
canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null);
} /**
* 獲取裁剪后的圓形圖片
*
* @param
*/// radius半徑
public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
Bitmap scaledSrcBmp; int diameter = radius * 2; // 為了防止寬高不相等，造成圓形圖片變形，因此截取長(zhǎng)方形中處于中間位置最大的正方形圖片
int bmpWidth = bmp.getWidth(); int bmpHeight = bmp.getHeight(); int squareWidth = 0, squareHeight = 0; int x = 0, y = 0;
Bitmap squareBitmap; if (bmpHeight > bmpWidth) {// 高大于寬
squareWidth = squareHeight = bmpWidth;
x = 0;
y = (bmpHeight - bmpWidth) / 2; // 截取正方形圖片
squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);
} else if (bmpHeight < bmpWidth) {// 寬大于高
squareWidth = squareHeight = bmpHeight;
x = (bmpWidth - bmpHeight) / 2;
y = 0;
squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);
} else {
squareBitmap = bmp;
} if (squareBitmap.getWidth() != diameter || squareBitmap.getHeight() != diameter) {
scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter, diameter, true);
} else {
scaledSrcBmp = squareBitmap;
}
Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
scaledSrcBmp.getHeight(),
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
Paint paint = new Paint();
Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(), scaledSrcBmp.getHeight());
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
scaledSrcBmp.getHeight() / 2,
scaledSrcBmp.getWidth() / 2,
paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
bmp = null;
squareBitmap = null;
scaledSrcBmp = null; return output;
} /**
* 邊緣畫(huà)圓 */
private void drawCircleBorder(Canvas canvas, int radius, int color) {
Paint paint = new Paint(); /* 去鋸齒 */
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
paint.setColor(color); /* 設(shè)置paint的 style 為STROKE：空心 */
paint.setStyle(Paint.Style.STROKE); /* 設(shè)置paint的外框?qū)挾?nbsp;*/
paint.setStrokeWidth(mBorderThickness);
canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);
}
}
使用時(shí)非常簡(jiǎn)單，直接在布局中調(diào)用自定義的類
activity_main.xml，這里要注意的是，第二個(gè)是帶有邊框的，效果圖如上
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:imagecontrol="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.ceshi.MainActivity"> <Button android:id="@+id/aaa" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="點(diǎn)擊設(shè)置頭像" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <com.example.ceshi.RoundImageView android:id="@+id/image" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" /> <!-- border_outside_color 外部圓圈的顏色 --> <!-- border_inside_color 內(nèi)部部圓圈的顏色 --> <!-- border_thickness 外圓和內(nèi)圓的寬度 --> <com.example.ceshi.RoundImageView android:id="@+id/img2" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" imagecontrol:border_inside_color="#bc0978" imagecontrol:border_outside_color="#ba3456" imagecontrol:border_thickness="1dp" /> </LinearLayout>
打開(kāi)圖庫(kù)選取圖片，截取圖片和設(shè)置圖片在MainActivity.class中實(shí)現(xiàn)
MainActivity.class
public class MainActivity extends AppCompatActivity { private Button bt; private static final int PHOTO_REQUEST_GALLERY = 2;// 從相冊(cè)中選擇
private static final int PHOTO_REQUEST_CUT = 3;// 結(jié)果
private ImageView photo,photo2; private File tempFile;
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
photo= (ImageView) findViewById(R.id.image);
photo2= (ImageView) findViewById(R.id.img2);
bt = (Button) findViewById(R.id.aaa);
bt.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View v) {// Intent intent=new Intent(Intent.ACTION_PICK);// intent.setType("image/*");// startActivityForResult(intent,PHOTO_REQUEST_GALLERY); // 激活系統(tǒng)圖庫(kù)，選擇一張圖片
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*"); // 開(kāi)啟一個(gè)帶有返回值的Activity，請(qǐng)求碼為PHOTO_REQUEST_GALLERY startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
}
});
} /*
* 剪切圖片 */
private void crop(Uri uri) { // 裁剪圖片意圖
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true"); // 裁剪框的比例，1：1
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1); // 裁剪后輸出圖片的尺寸大小
intent.putExtra("outputX", 250);
intent.putExtra("outputY", 250);
intent.putExtra("outputFormat", "JPEG");// 圖片格式
intent.putExtra("noFaceDetection", true);// 取消人臉識(shí)別
intent.putExtra("return-data", true); // 開(kāi)啟一個(gè)帶有返回值的Activity，請(qǐng)求碼為PHOTO_REQUEST_CUT startActivityForResult(intent, PHOTO_REQUEST_CUT);
}
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == PHOTO_REQUEST_GALLERY) { // 從相冊(cè)返回的數(shù)據(jù)
if (data != null) { // 得到圖片的全路徑
Uri uri = data.getData();
crop(uri);
}
} else if (requestCode == PHOTO_REQUEST_CUT) { // 從剪切圖片返回的數(shù)據(jù)
if (data != null) {
Bitmap bitmap = data.getParcelableExtra("data");
photo.setImageBitmap(bitmap);
photo2.setImageBitmap(bitmap);
} try { // 將臨時(shí)文件刪除 tempFile.delete();
} catch (Exception e) {
e.printStackTrace();
}
} super.onActivityResult(requestCode, resultCode, data);
}
}
以上就可以實(shí)現(xiàn)自定義控件，設(shè)置圓形頭像
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