首先是依赖和权限:
**implementation 'com.nostra13.universalimageloader:universal-image-loader:1.9.2’
<uses-permission android:name=“android.permission.INTERNET”/
<uses-permission android:name=“android.permission.WRITE_EXTERNAL_STORAGE”/
然后是写一个类继承android.support.v7.widget.AppCompatImageView
来看一下代码:
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;
public class DispalyImageOptions extends android.support.v7.widget.AppCompatImageView {
//画笔
private Paint mPaint;
//圆形图片的半径
private int mRadius;
//图片的宿放比例
private float mScale;
public DispalyImageOptions(Context context) {
super(context);
}
public DispalyImageOptions(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public DispalyImageOptions(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//由于是圆形,宽高应保持一致
int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
mRadius = size / 2;
setMeasuredDimension(size, size);
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
mPaint = new Paint();
Drawable drawable = getDrawable();
if (null != drawable) {
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
//初始化BitmapShader,传入bitmap对象
BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
//计算缩放比例
mScale = (mRadius * 2.0f) / Math.min(bitmap.getHeight(), bitmap.getWidth());
Matrix matrix = new Matrix();
matrix.setScale(mScale, mScale);
bitmapShader.setLocalMatrix(matrix);
mPaint.setShader(bitmapShader);
//画圆形,指定好坐标,半径,画笔
canvas.drawCircle(mRadius, mRadius, mRadius, mPaint);
} else {
super.onDraw(canvas);
}
}
}
在Xml布局的imageview一定要改成刚才你建的那个类的全路径名(我建得类是《DispalyImageOptions 》)
<com.lgy.rk08.universalimageloader.DispalyImageOptions
android:id="@+id/meFragmentImageView"
android:layout_width=“80dip”
android:layout_height=“80dip”
android:layout_gravity=“center_horizontal”
android:layout_marginTop=“10dip”
android:contentDescription=“ssssss”
android:src="@mipmap/ic_launcher" />
需要在新建个类来设置ImageLoaderConfiguration来加载图片
import android.app.Application;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
public class Appliction extends Application {
@Override
public void onCreate() {
super.onCreate();
ImageLoaderConfiguration loaderConfiguration = new ImageLoaderConfiguration.Builder(this).build();
ImageLoader.getInstance().init(loaderConfiguration);
}
}
注意这里需要来注册
然后就是设置加载图片的路径
第一个参数是图片的路径,第一个参数是图片的id,我这里是在BaseAdapter请求网络加载的。
ImageLoader.getInstance().displayImage(list.get(position).getPic_url(), holder.imgee);