Android学习笔记技巧之给文本加边框

BorderTextViews.Java

1. package xiaosi.BorderTextView;
2. import android.content.Context;
3. import android.graphics.Canvas;
4. import android.graphics.Color;
5. import android.graphics.Paint;
6. import android.util.AttributeSet;
7. import android.widget.TextView;
8. public class BorderTextViews extends TextView
9. {
10. private Paint paint = null;
11. private int color = Color.GRAY;
12. public BorderTextViews(Context context, AttributeSet attrs)
13. {
14. super(context, attrs);
15. }
16. //设置边框颜色
17. public void setPaintColor(int color){
18. this.color = color;
19. }
20. @Override
21. protected void onDraw(Canvas canvas)
22. {
23. super.onDraw(canvas);
24. paint = new Paint();
25. //给边框设置颜色
26. paint.setColor(color);
27. //上
28. canvas.drawLine(0, 0, this.getWidth()-1, 0, paint);
29. //左
30. canvas.drawLine(0, 0, 0, this.getHeight()-1, paint);
31. //下
32. canvas.drawLine(0, this.getHeight()-1, this.getWidth()-1, this.getHeight()-1, paint);
33. //右
34. canvas.drawLine(this.getWidth()-1, 0, this.getWidth()-1, this.getHeight()-1, paint);
35. }
36. }

1. package xiaosi.BorderTextView;
2. import android.app.Activity;
3. import android.graphics.Color;
4. import android.os.Bundle;
5. public class BorderTextViewActivity extends Activity {
6. /** Called when the activity is first created. */
7. private BorderTextViews borderTextView = null;
8. @Override
9. public void onCreate(Bundle savedInstanceState) {
10. super.onCreate(savedInstanceState);
11. setContentView(R.layout.main);
12. borderTextView = (BorderTextViews)findViewById(R.id.Border);
13. borderTextView.setPaintColor(Color.GRAY);
14. }
15. }

main.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:orientation="vertical"
6. android:background="#CCFF66">
7. <xiaosi.BorderTextView.BorderTextViews
8. android:id="@+id/Border"
9. android:layout_width="wrap_content"
10. android:layout_height="wrap_content"
11. android:textColor="#C71585"
12. android:layout_marginTop="20dp"
13. android:padding="10dp"
14. android:layout_gravity="center"
15. android:text="在画布上画边框" />
16. </LinearLayout>