【Android(安卓)界面效果44】Android之圆头像实例

在很多应用中，我们看到，个人主页里面的头像一般都是圆的，设计成圆的会使整个界面布局变的优雅漂亮。那么，怎么使头像变圆呢？有的人说可以在上面加一个中间为透明圆形的png图，用它来遮盖住头像不就行了嘛，但是png四周始终始终是不透明的，怎么做也达不到如下的效果图的。

下面我们讲讲怎么做成的吧。

首先创建一个继承ImageView的抽象类MaskedImage。让他重写onDraw方法。代码如下

    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 paramContext) {              super(paramContext);          }                public MaskedImage(Context paramContext, AttributeSet paramAttributeSet) {              super(paramContext, paramAttributeSet);          }                public MaskedImage(Context paramContext, AttributeSet paramAttributeSet, int paramInt) {              super(paramContext, paramAttributeSet, paramInt);          }                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);              }          }      }

然后新建一个类CircularImage继承MaskedImage。代码如下：

public class CircularImage extends MaskedImage {      public CircularImage(Context paramContext) {          super(paramContext);      }        public CircularImage(Context paramContext, AttributeSet paramAttributeSet) {          super(paramContext, paramAttributeSet);      }        public CircularImage(Context paramContext, AttributeSet paramAttributeSet, int paramInt) {          super(paramContext, paramAttributeSet, paramInt);      }        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;      }  }

新建一个MainActivity，代码如下：

    public class MainActivity extends Activity {                @Override          protected void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              setContentView(R.layout.activity_main);                            CircularImage cover_user_photo = (CircularImage) findViewById(R.id.cover_user_photo);              cover_user_photo.setImageResource(R.drawable.face);          }      }

其XML布局文件为：

<RelativeLayout 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:gravity="center" >                <ImageView              android:layout_width="82.0dip"              android:layout_height="82.0dip"              android:layout_centerInParent="true"              android:contentDescription="@null"              android:src="@drawable/me_head_bg" />                <com.doublefi123.diary.widget.CircularImage              android:id="@+id/cover_user_photo"              android:layout_width="74.0dip"              android:layout_height="74.0dip"              android:layout_centerInParent="true" />            </RelativeLayout>

源码在此：http://download.csdn.net/detail/dongdong230/8428989 (免费奉献源码)

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