用ListView来展示自定义圆形控件（加载的是本地图片）

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1、主布局就是ListView

<ListView    android:id="@+id/lv"    android:layout_width="match_parent"    android:layout_height="match_parent"></ListView>

2、给每一个ListView'的Item项写布局文件名叫 item

<com.baway.circle.RoundImageView    android:id="@+id/rv"    android:layout_width="100dp"    android:layout_height="100dp" />

引用了画图片的那个类

3、定义画图的类

package com.baway.circle;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.ImageView;/** * Created by 王秋旺 on 2016/6/7. */public class RoundImageView extends ImageView {    public RoundImageView(Context context) {        super(context);    }    public RoundImageView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public RoundImageView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Drawable drawable = getDrawable();        if (drawable == null) {            return;        }        if (getWidth() == 0 || getHeight() == 0) {            return;        }        Bitmap b =  ((BitmapDrawable)drawable).getBitmap();        if(null == b)        {            return;        }        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);        int w = getWidth(), h = getHeight();       //调用        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)            sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);        else            sbmp = bmp;        Bitmap output = Bitmap.createBitmap(sbmp.getWidth(),                sbmp.getHeight(), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(output);        final int color = 0xffa19774;        final Paint paint = new Paint();        final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());        paint.setAntiAlias(true);        paint.setFilterBitmap(true);        paint.setDither(true);        canvas.drawARGB(0, 0, 0, 0);        paint.setColor(Color.parseColor("#BAB399"));        canvas.drawCircle(sbmp.getWidth() / 2+0.7f, sbmp.getHeight() / 2+0.7f,                sbmp.getWidth() / 2+0.1f, paint);        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));        canvas.drawBitmap(sbmp, rect, rect, paint);        return output;    }}

4、MainActivity中的内容

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ListView lv= (ListView) findViewById(R.id.lv);         List<Integer> img_list=new ArrayList<>();         img_list.add(R.mipmap.aaa);         img_list.add(R.mipmap.bbb);         img_list.add(R.mipmap.ccc);         img_list.add(R.mipmap.ddd);        lv.setAdapter(new MyAdapter(MainActivity.this,img_list));    }}

5、适配器里面的内容

package com.baway.circle.adapter;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.drawable.Drawable;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import com.baway.circle.R;import com.baway.circle.RoundImageView;import java.util.List;import static android.view.View.*;/** * Created by 王秋旺 on 2016/6/7. */public class MyAdapter extends BaseAdapter{    private Context context;    private List<Integer> img_list;    public MyAdapter(Context context,List<Integer> img_list){        this.context=context;        this.img_list=img_list;    }    @Override    public int getCount() {        return img_list.size();    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public Object getItem(int position) {        return img_list.get(position);    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if (convertView==null){            convertView=View.inflate(context,R.layout.item,null);        }        RoundImageView rv= (RoundImageView) convertView.findViewById(R.id.rv);        Bitmap bm=BitmapFactory.decodeResource(context.getResources(),img_list.get(position));        Bitmap bitmap = RoundImageView.getCroppedBitmap(bm, 400);        rv.setImageBitmap(bitmap);        return convertView;    }}

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