我在不同的API测试我的应用程序,它似乎在API 17工作到23,但我在API 16发现,我无法载入我的customview。我只是想显示在一个圈子中的照片,我已经获得的代码从这个线程customview:How to create a circular ImageView in Android?CircularImageView和API 16:NullPointerException异常错误
我的代码粘贴在这里:
public class CircularImageView extends ImageView {
public CircularImageView(Context context) {
super(context);
}
public CircularImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CircularImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
int w = getWidth();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
canvas.drawBitmap(roundBitmap, 0, 0, null);
}
public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
Bitmap sbmp;
if (bmp.getWidth() != radius || bmp.getHeight() != radius) {
float smallest = Math.min(bmp.getWidth(), bmp.getHeight());
float factor = smallest/radius;
sbmp = Bitmap.createScaledBitmap(bmp, (int) (bmp.getWidth()/factor), (int) (bmp.getHeight()/factor), false);
} else {
sbmp = bmp;
}
Bitmap output = Bitmap.createBitmap(radius, radius,
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, radius, radius);
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor("#BAB399"));
canvas.drawCircle(radius/2 + 0.7f,
radius/2 + 0.7f, radius/2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(sbmp, rect, rect, paint);
return output;
}
}
在此行中出现的错误:
if (bmp.getWidth() != radius || bmp.getHeight() != radius)
这是logcat的:
01-09 15:09:51.185 2119年至2119年/? E/AndroidRuntime:FATAL EXCEPTION:main java.lang.NullPointerException at com.example.simon.customshapes.CircularImageView.getCroppedBitmap(CircularImageView.java:59) at com.example.simon.customshapes.CircularImageView.onDraw(CircularImageView。的java:51) 在android.view.View.draw(View.java:13458) 在android.view.View.getDisplayList(View.java:12409) 在android.view.View.getDisplayList(View.java: 12453) at android.view.View.draw(View.java:13182) at android.view.ViewGroup.drawChild(ViewGroup.java:2929) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799) 在android.view.java:13461, at android.view.View.getDisplayList(View.java:12409) at android.view.View.getDisplayList(View.java:12453) at android .view.View.draw(View.java:13182) at android.view.ViewGroup.drawChild(ViewGroup.java:2929) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799) at android.view .View.getDisplayList(View.java:12407) at android.view.View.getDisplayList(View.java:12453) at android.view.View.draw(View.java:13182) at android.view.ViewGroup .drawChild(ViewGroup.java:2929) 在android.support.v7.wi droid.RecyclerView.drawChild(RecyclerView.java:3588) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799) at android.view.View.draw(View.java:13461) at android.support。 v7.widget.RecyclerView.draw(RecyclerView.java:3097) at android.view.View.getDisplayList(View.java:12409) at android.view.View.getDisplayList(View.java:12453) at android。 view.draw.View(view.java:13182) at android.view.ViewGroup.drawChild(ViewGroup.java:2929) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2806) at android.view。 View.draw(View.java:13461) 在android.view .View.getDisplayList(View.java:12409) at android.view.View.getDisplayList(View.java:12453) at android.view.View.draw(View.java:13182) at android.view.ViewGroup .drawChild(ViewGroup.java:2929) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799) at android.view.View.getDisplayList(View.java:12407) at android.view.View.getDisplayList (View.java:12453) 在android.view.View.draw(查看。的java:13182) 在android.view.ViewGroup.drawChild(ViewGroup.java:2929) 在android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799) 在android.view.View.draw(View.java: (View.java:12409) at android.support.v4.view.ViewPager.draw(ViewPager.java:2262) at android.view.View.getDisplayList(View.java:12409) at android.view.View.getDisplayList(View。 java:12453) at android.view.View.draw(View.java:13182) at android.view.ViewGroup.drawChild(ViewGroup.java:2929) at android.support.design.widget.CoordinatorLayout.drawChild( CoordinatorLayout.java:1077) at android.view.Vie在android.view.View.getDisplayList(View.java:12453) 上的android.view.View.getDisplayList(View.java:12407) 上的wGroup.dispatchDraw(ViewGroup.java:2799) 。绘制(View.java:13182) 在android.view.ViewGroup.drawChild(ViewGroup.java:2929) 在android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799) 在android.view.View.getDisplayList( (View.java:12407) at android.view.View.getDisplayList(View.java:12453) at android.view.View.draw(View.java:13182) at android.view.ViewGroup.drawChild(ViewGroup。 Java的:2929) 在android.view.ViewGroup.dispatchDra w(ViewGroup.java:2799) at android.view.View.getDisplayList(View.java:12407) at android.view.View.getDisplayList(View.java:12453) at android.view.View.draw( View.java:13182) 在android.view.ViewGroup.drawChild(ViewGroup.java:2929) 在android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799) 在android.view.View.draw(查看。 (View.java:12409) at android.view.View.getDisplayList(View.java:java:13461) at android.widget.FrameLayout.draw(FrameLayout.java:467) at android.view.ViewDisplayList(View.java:12409) at android.view.View.getDisplayList(View.java: 12453) 在android.view.View.draw(View.java:13182) at android.view.ViewGroup.drawChild(ViewGroup.java:2929) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799) at android.view.View.getDisplayList(View.java:12407) at android.view.View.getDisplayList(View.java:12453) at android.view.View.draw(View.java:13182) at android.view.ViewGroup.drawChild(ViewGroup.java:2929) at
是否有一个原因,我不能画在Android的API 16圆形ImageView的?
Plz使用CircleImageView https://github.com/hdodenhof/CircleImageView。 –