在有些时候,我们需要一些特殊的控件,比如EditText要具有整行下划线。我们通过重写EditText来实现
public class CustomTextView extends EditText {
private final Paint mPaint = new Paint();
private final Rect mRect = new Rect();
public CustomTextView(Context context) {
super(context);
initPaint();
}
public CustomTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initPaint();
}
public CustomTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initPaint();
}
public CustomTextView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
initPaint();
}
// 初始化画笔
private void initPaint() {
mPaint.setColor(Color.parseColor("#DCDCDC"));
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setAntiAlias(true);
mPaint.setStrokeWidth(2);
}
@Override
protected void onDraw(Canvas canvas) {
Rect r = mRect;
Paint paint = mPaint;
// 遍历每一行文本
for (int i = 0; i < getLineCount(); i++) {
// 获取第i行的基线位置
int baseline = getLineBounds(i, r);
// 在第i行的基线上方绘制一条水平线
canvas.drawLine(r.left, baseline + 1, r.right, baseline + 1, paint);
}
super.onDraw(canvas);
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="class_0427.Class0427ActivityMainActivity">
<class_0427.CustomTextView
android:id="@+id/my_custom_textview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="18sp"
android:textColor="@color/black"
/>
</LinearLayout>
public class Class0427ActivityMainActivity extends AppCompatActivity {
private CustomTextView my_custom_textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.class_0427_activity_main);
my_custom_textView = findViewById(R.id.my_custom_textview);
my_custom_textView.setText("据了解,这次演讲的主题是关于小米食堂的爆品大麻花,邴佳宝以工程师的思维去创新菜品,使得原本普通的食材焕发出了新的生机。在演讲中,他提到了“初期产能不足限量发售”、“被质疑饥饿营销”、“技术革新提高产能”等一系列充满小米特色的“米式”金句,让在场的观众都忍不住捧腹大笑,氛围比某些手机发布会还好。\n" +
"\n" +
"作者:王五\n" +
"链接:https://www.zhihu.com/question\n" +
"来源:知乎\n" +
"著作权归作者所有。商业转载请联系作者获得授权,非商业转载请注明出处。");
}
}