Android学习笔记技巧之给文本加边框

BorderTextViews.java

package xiaosi.BorderTextView;    import android.content.Context;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.Paint;  import android.util.AttributeSet;  import android.widget.TextView;    public class BorderTextViews extends TextView  {   private Paint paint = null;   private int color = Color.GRAY;   public BorderTextViews(Context context, AttributeSet attrs)   {    super(context, attrs);   }      //设置边框颜色   public void setPaintColor(int color){    this.color = color;   }   @Override   protected void onDraw(Canvas canvas)   {    super.onDraw(canvas);    paint = new Paint();    //给边框设置颜色    paint.setColor(color);    //上    canvas.drawLine(0, 0, this.getWidth()-1, 0, paint);    //左    canvas.drawLine(0, 0, 0, this.getHeight()-1, paint);    //下    canvas.drawLine(0, this.getHeight()-1, this.getWidth()-1, this.getHeight()-1, paint);    //右    canvas.drawLine(this.getWidth()-1, 0, this.getWidth()-1, this.getHeight()-1, paint);   }  }

package xiaosi.BorderTextView;    import android.app.Activity;  import android.graphics.Color;  import android.os.Bundle;    public class BorderTextViewActivity extends Activity {      /** Called when the activity is first created. */   private BorderTextViews borderTextView = null;      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.main);          borderTextView = (BorderTextViews)findViewById(R.id.Border);          borderTextView.setPaintColor(Color.GRAY);      }  }

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:layout_width="fill_parent"      android:layout_height="fill_parent"      android:orientation="vertical"       android:background="#CCFF66">        <xiaosi.BorderTextView.BorderTextViews          android:id="@+id/Border"          android:layout_width="wrap_content"           android:layout_height="wrap_content"    android:textColor="#C71585"     android:layout_marginTop="20dp"    android:padding="10dp"     android:layout_gravity="center"     android:text="在画布上画边框" />    </LinearLayout>