Android下图片变圆角的代码封装
main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/layout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <!-- <com.lian.image.SetImage android:id="@+id/show" android:layout_width="wrap_content" android:layout_height="wrap_content" /> --> <ListView android:id="@+id/listview" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_marginLeft="50dp" android:cacheColorHint="#000" android:divider="#000" android:dividerHeight="5px" android:fadingEdge="none" android:scrollbars="none" android:scrollingCache="true" /> </LinearLayout>package com.lian.image;
import android.content.Context; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Path; import android.graphics.PixelFormat; import android.graphics.PorterDuff.Mode; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.widget.ImageView; public class SetImage extends ImageView { public SetImage(Context context) { super(context); // TODO Auto-generated constructor stub } public SetImage(Context context, AttributeSet attrs) { super(context, attrs, 0); } protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub Path clipPath = new Path(); int w = this.getWidth(); int h = this.getHeight(); clipPath.addRoundRect(new RectF(0, 0, w, h), 10.0f, 10.0f, Path.Direction.CW); canvas.clipPath(clipPath); super.onDraw(canvas); } public void setImageDrawable(Drawable drawable, int pixels) { // TODO Auto-generated method stub Bitmap bitmap =toRoundCorner(drawableToBitmap(drawable), pixels); Drawable drawable1 = new BitmapDrawable(bitmap); super.setImageDrawable(drawable1); } public void setImageBitmap(Drawable drawable, int pixels) { // TODO Auto-generated method stub super.setImageBitmap(toRoundCorner(drawableToBitmap(drawable), pixels)); } public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) { //创建一个和原始图片一样大小位图 Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888); //创建带有位图bitmap的画布 Canvas canvas = new Canvas(output); final int color = 0xff424242; //创建画笔 final Paint paint = new Paint(); //创建一个和原始图片一样大小的矩形 final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = new RectF(rect); final float roundPx = pixels; // 去锯齿 paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); //画一个和原始图片一样大小的圆角矩形 canvas.drawRoundRect(rectF, roundPx, roundPx, paint); //设置相交模式 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); //把图片画到矩形去 canvas.drawBitmap(bitmap, rect, rect, paint); return output; } public static Bitmap drawableToBitmap(Drawable drawable){ int width = drawable.getIntrinsicWidth(); int height = drawable.getIntrinsicHeight(); //创建一个和原始图片一样大小位图 Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);//创建一个指定高、宽的可变的Bitmap图像 //创建带有位图bitmap的画布 Canvas canvas = new Canvas(bitmap); drawable.setBounds(0,0,width,height); drawable.draw(canvas); return bitmap; } } package com.lian.image; import java.util.ArrayList; import java.util.HashMap; import android.app.Activity; import android.content.Context; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; public class SetDrawable extends Activity { private ArrayList<HashMap<String,Object>> data; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main); /* Drawable drawable1 = getResources().getDrawable(R.drawable.benchi1); SetImage imageView1 = (SetImage) findViewById(R.id.show); imageView1.setImageDrawable(drawable1, 20); imageView1.setImageBitmap(drawable1, 20);*/ data = getData(); ListView list = (ListView)findViewById(R.id.listview); MyAdapter adapter = new MyAdapter(SetDrawable.this, data, R.layout.list); list.setAdapter(adapter); } private ArrayList<HashMap<String,Object>> getData(){ ArrayList<HashMap<String,Object>> list = new ArrayList<HashMap<String,Object>>(); HashMap<String,Object> map = new HashMap<String,Object>(); for(int i = 0 ; i<100 ; i++){ map.put("show",R.drawable.benchi1); list.add(map); } return list; } class ViewHolder{ public SetImage image; } class MyAdapter extends BaseAdapter{ //定义一个LayoutInflater来导入资料文件 LayoutInflater inflater; //用来接管要绑定的数据 ArrayList<HashMap<String,Object>> arrayList; //要绑定的资料文件id int resID; public MyAdapter(Context context, ArrayList<HashMap<String, Object>> arrayList, int resID) { this.inflater = LayoutInflater.from(context); this.arrayList = arrayList; this.resID = resID; } //绑定的数据的长度，也就是ListView项的个数 @Override public int getCount() { // TODO Auto-generated method stub return this.arrayList.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } @Override public View getView(final int position, View convertView, ViewGroup parent) { //创建一个ViewHolder来盛放控件 ViewHolder vHolder; //经由过程断定convertView是否为空来取得ViewHolder对象 //这个convertView就是ListView的一行 if (convertView == null) { //若是为null则从布局文件中导入 convertView=inflater.inflate(resID, null); vHolder=new ViewHolder(); vHolder.image = (SetImage)convertView.findViewById(R.id.show); //setTag办法用来设置与视图接洽关系的标签，我的懂得就是把和它相干的ViewHolder存储起来，到用的时候再拿出来 convertView.setTag(vHolder); } else{ //若是不为null就直接经由过程getTag取出来 vHolder = (ViewHolder)convertView.getTag(); } //然后给ViewHolder对象的每一项赋值 s Drawable drawable1 = getResources().getDrawable(R.drawable.benchi1); vHolder.image.setImageBitmap(drawable1, 20); return convertView; } } }