将图片改成圆形图片，自定义imageview控件

http://blog.csdn.net/doublefi123/article/details/8795282

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

[java]
view plaincopyprint?

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);
}
}
}

[java] view plain copy print?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();
10759

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);
}
}
}

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：

[java]
view plaincopyprint?

<SPAN style=“FONT-SIZE: 14px”>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; } }</SPAN>

[java] view plain copy print?<span style=“font-size:14px;” data-filtered=“filtered”>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; } }</span>

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：

[java]
view plaincopyprint?

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); } }

[java] view plain copy print?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); } }

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：

[html]
view plaincopyprint?

<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>

[html] view plain copy print?<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>

<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>

这样就OK啦。哈哈

源码在此：http://download.csdn.net/detail/doublefi123/5252186

</div>