android 用代码分别实现textview的背景和圆角

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）