Android學習筆記-繪製圓形ImageView執行個體，androidimageview

Android學習筆記-繪製圓形ImageView執行個體，androidimageview

現在很多的APP都很喜歡圓形的頭像，這裡就簡單的寫個圓形的ImageView~

第三方圓形ImageView控制項：

RoundedImageView

CircleImageView

 

實現代碼：

自訂ImageView：RoundImageView.java

package com.jay.demo.imageviewdemo;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PaintFlagsDrawFilter;import android.graphics.Path;import android.graphics.Rect;import android.graphics.Region;import android.util.AttributeSet;import android.widget.ImageView;/** * Created by coder-pig on 2015/7/18 0018. */public class RoundImageView extends ImageView {    private Bitmap mBitmap;    private Rect mRect = new Rect();    private PaintFlagsDrawFilter pdf = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG);    private Paint mPaint = new Paint();    private Path mPath=new Path();    public RoundImageView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    //傳入一個Bitmap對象    public void setBitmap(Bitmap bitmap) {        this.mBitmap = bitmap;    }    private void init() {        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);        mPaint.setAntiAlias(true);// 抗鋸尺    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if(mBitmap == null)        {            return;        }        mRect.set(0,0,getWidth(),getHeight());        canvas.save();        canvas.setDrawFilter(pdf);        mPath.addCircle(getWidth() / 2, getWidth() / 2, getHeight() / 2, Path.Direction.CCW);        canvas.clipPath(mPath, Region.Op.REPLACE);        canvas.drawBitmap(mBitmap, null, mRect, mPaint);        canvas.restore();    }}

布局代碼：activity_main.xml:

<com.jay.demo.imageviewdemo.RoundImageView        android:id="@+id/img_round"        android:layout_width="200dp"        android:layout_height="200dp"        android:layout_margin="5px"/>

MainActivity.java:

package com.jay.demo.imageviewdemo;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {    private RoundImageView img_round;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        img_round = (RoundImageView) findViewById(R.id.img_round);        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.meinv);        img_round.setBitmap(bitmap);    }}