设置view的圆角和背景一般都是在xml里面通过selector的配置文件来写的。在项目中有个需求，背景颜色是从网络获取的，而且要设置为圆角，想了一下，通过xml的形式貌似实现不了，只能通过代码分别设置，就只能重写Textview。
来，上代码：
package com.paddy.roundtextviewdemo.view;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import com.paddy.roundtextviewdemo.R;
public class RoundTextView extends TextView {
private Context mContext;
private int mBgColor = 0;
private int mCornerSize = 0;
public RoundTextView(Context context, AttributeSet attrs) {
super(context, attrs);
getAttrs(context, attrs);
mContext = context;
}
@Override
protected void onDraw(Canvas canvas)
{
setBackgroundRounded(canvas, this.getMeasuredWidth(), this.getMeasuredHeight(), this);
super.onDraw(canvas);
}
private void getAttrs(Context context, AttributeSet attrs) {
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.round_textview);
mBgColor = ta.getColor(R.styleable.round_textview_round_tv_color, R.color.blue);
mCornerSize = (int)ta.getDimension(R.styleable.round_textview_round_tv_corner_size, 8);
ta.recycle();
}
public void setBackgroundRounded(Canvas c, int w, int h, View v){
if(w <= 0 || h <= 0){
return;
}
Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG);
paint.setAntiAlias(true);
paint.setColor(mBgColor);
RectF rec = new RectF(0, 0, w, h);
c.drawRoundRect(rec, mCornerSize, mCornerSize, paint);
}
}
在调用它的activity里面，需要重新设置一下显示的内容，这样会让view重绘，如下：
public class MainActivity extends Activity {
private RoundTextView mTv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTv = (RoundTextView)findViewById(R.id.testTv);
mTv.setText("good");
}
}
源码demo链接附上：http://download.csdn.net/detail/paddyy/8266287
注意：这个demo要改一下，换成blog中的代码（ps：不知道怎么删除之前上传的资源，貌似没这个功能）