现在很多android项目都涉及到了圆形头像,特别是在登录界面中随处可见!可是,我不会,怎么办?不用怕,快用小二颗粒!妈妈再也不用担心我的学习了!不是啦,接下来我就给大家分享分享在android中怎么绘制圆形头像.
首先直接上个图,有图有真相嘛:
第一步:首先在/res/values/attrs.xml下:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="CircleImageView">
<attr name="border_width" format="dimension"/>
<attr name="border_color" format="color"/>
</declare-styleable>
</resources>
第二步:当然是我们最爱的自定义的View啦
首先:创建一个类(CircleImageView)继承ImageView.
然后:覆写构造方法.
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 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 int mBorderColor = DEFAULT_BORDER_COLOR;
private int mBorderWidth = DEFAULT_BORDER_WIDTH;
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;
public CircleImageView(Context context) {
this(context, null);
}
public CircleImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
//获取自定义属性
TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.CircleImageView,defStyle,0);
mBorderWidth = ta.getDimensionPixelSize(R.styleable.CircleImageView_border_width,DEFAULT_BORDER_WIDTH);
mBorderColor = ta.getColor(R.styleable.CircleImageView_border_color,DEFAULT_BORDER_COLOR);
//释放资源,防止缓存数据
ta.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(SCALE_TYPE != 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(getDrawable() == null) {
return;
}
canvas.drawCircle(getWidth()/2,getHeight()/2,mDrawableRadius,mBitmapPaint);
if(mBorderWidth != 0) {
canvas.drawCircle(getWidth()/2,getHeight()/2,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 int getBorderWidth(){
return mBorderWidth;
}
public void setBorderWidth(int borderWidth) {
if (borderWidth == mBorderWidth) {
return;
}
mBorderWidth = borderWidth;
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(int resId) {
super.setImageResource(resId);
mBitmap = getBitmapFromDrawable(getDrawable());
setup();
}
@Override
public void setImageURI(Uri uri) {
super.setImageURI(uri);
mBitmap = getBitmapFromDrawable(getDrawable());
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 (OutOfMemoryError e) {
return null;
}
}
private void setup() {
if (!mReady) {
mSetupPending = true;
return;
}
if (mBitmap == null) {
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);
mBitmapHeight = mBitmap.getHeight();
mBitmapWidth = mBitmap.getWidth();
mBorderRect.set(0, 0, getWidth(), getHeight());
mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2);
mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth);
mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2);
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) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth);
mBitmapShader.setLocalMatrix(mShaderMatrix);
}
}
第三步:引用自定义View和自定义属性:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"//引用自定义属性
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.circleimageviewdemo.MainActivity$PlaceholderFragment">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:padding="@dimen/base_padding"
android:background="@color/light">
//引用自定义View
<com.example.circleimageviewdemo.CircleImageView
android:layout_width="160dp"
android:layout_height="160dp"
android:layout_centerInParent="true"
android:src="@drawable/zane"
app:border_width="2dp"
app:border_color="@color/dark" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:padding="@dimen/base_padding"
android:background="@color/dark">
<com.example.circleimageviewdemo.CircleImageView
android:layout_width="160dp"
android:layout_height="160dp"
android:layout_centerInParent="true"
android:src="@drawable/zane"
app:border_width="2dp"
app:border_color="@color/light" />
</RelativeLayout>
</LinearLayout>
第四步:让我的头像圆起来
public class MyActivity extends Activity {附件:
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if(savedInstanceState == null) {
getFragmentManager().beginTransaction().add(R.id.container,new MainFragment()).commit();//替换
}
}
public static class MainFragment extends Fragment {
public MainFragment(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main,container,false);
return rootView;
}
}
}
1.activity_main.xml
<?xml version="1.0" encoding="utf-8"?>2.colors.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.circleimageviewdemo.MyActivity"
tools:ignore="MergeRootFrame" />
<?xml version="1.0" encoding="utf-8"?>3.dimens.xml
<resources>
<color name="dark">#FF222222</color>
<color name="light">#FFEEEEEE</color>
</resources>
<?xml version="1.0" encoding="utf-8"?>
<resources>
<dimen name="base_padding">16dp</dimen>
</resources>
-----------------------------------------------------------------上面的太难了,下面的来个简单点的----------------------------------------------------------
第一步:来个自定义View,该类是一个抽象类,所有的类都继承于此!
public abstract class MaskedImage extends ImageView {
private static final Xfermode MASK_XFERMODE;
private Bitmap mask;
private Paint paint;
static {
PorterDuff.Mode localMode = PorterDuff.Mode.DST_IN;
MASK_XFERMODE = new PorterDuffXfermode(localMode);
}
public MaskedImage(Context context) {
this(context, null);
}
public MaskedImage(Context context, AttributeSet attrs) {
this(context, attrs ,0);
}
public MaskedImage(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public abstract Bitmap createMask();
protected void onDraw(Canvas paramCanvas) {
Drawable localDrawable = getDrawable();
if (localDrawable == null)
return;
try {
if (this.paint == null) {
Paint localPaint1 = new Paint();
this.paint = localPaint1;
this.paint.setFilterBitmap(false);
Paint localPaint2 = this.paint;
Xfermode localXfermode1 = MASK_XFERMODE;
@SuppressWarnings("unused")
Xfermode localXfermode2 = localPaint2.setXfermode(localXfermode1);
}
float f1 = getWidth();
float f2 = getHeight();
int i = paramCanvas.saveLayer(0.0F, 0.0F, f1, f2, null, 31);
int j = getWidth();
int k = getHeight();
localDrawable.setBounds(0, 0, j, k);
localDrawable.draw(paramCanvas);
if ((this.mask == null) || (this.mask.isRecycled())) {
Bitmap localBitmap1 = createMask();
this.mask = localBitmap1;
}
Bitmap localBitmap2 = this.mask;
Paint localPaint3 = this.paint;
paramCanvas.drawBitmap(localBitmap2, 0.0F, 0.0F, localPaint3);
paramCanvas.restoreToCount(i);
return;
} catch (Exception localException) {
StringBuilder localStringBuilder = new StringBuilder().append("Attempting to draw with recycled bitmap. View ID = ");
System.out.println("localStringBuilder=="+localStringBuilder);
}
}
}
第二步:创建一个类继承MaskedImage:
public class CircleImageView extends MaskedImage{
public CircleImageView(Context context) {
this(context, null);
}
public CircleImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public Bitmap createMask() {
int i = getWidth();
int j = getHeight();
Bitmap.Config localConfig = Bitmap.Config.ARGB_8888;
Bitmap localBitmap = Bitmap.createBitmap(i, j, localConfig);
Canvas localCanvas = new Canvas(localBitmap);
Paint localPaint = new Paint(1);
localPaint.setColor(-16777216);
float f1 = getWidth();
float f2 = getHeight();
RectF localRectF = new RectF(0.0F, 0.0F, f1, f2);
localCanvas.drawOval(localRectF, localPaint);
return localBitmap;
}
}
第三步:来个布局文件,引用自定义View
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<!--<ImageView
android:layout_width="82.0dip"
android:layout_height="82.0dip"
android:layout_centerInParent="true"
android:contentDescription="@null"
android:src="@drawable/zane" />-->
//引用自定义View
<com.example.circleimageviewdemo2.CircleImageView
android:id="@+id/cover_user_photo"
android:layout_width="74.0dip"
android:layout_height="74.0dip"
android:layout_centerInParent="true" />
</RelativeLayout>
第四步:让我们的头像圆起来
public class MyActivity extends Activity {
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//让我们的头像圆起来
CircleImageView circleImageView = (CircleImageView) findViewById(R.id.cover_user_photo);
circleImageView.setImageResource(R.drawable.zane);
}
}
免责声明:转载http://blog.csdn.net/dajian790626/article/details/17043347