<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">    <!-- Customize your theme here. -->    <item name="colorPrimary">@color/colorPrimary</item>    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>    **<item name="colorAccent">@color/colorPrimaryDark</item>**

//此時(shí)必須要設(shè)置其背景為空<EditText    android:background="@null"    android:drawableBottom="@drawable/line"    android:hint="請(qǐng)輸入您的手機(jī)號(hào)碼"    android:layout_width="match_parent"    android:layout_height="wrap_content"/>

//資源名稱為 drawable/line<shape xmlns:android="http://schemas.android.com/apk/res/android">  <solid android:color="@color/colorBlue" />  <size    android:height="1dp"    android:width="1000dp" /></shape>

public class UnderLineEditText extends EditText {  private Paint paint;  public UnderLineEditText(Context context, AttributeSet attrs) {    super(context, attrs);    //設(shè)置畫筆的屬性    paint = new Paint();    paint.setStyle(Paint.Style.STROKE);    //設(shè)置畫筆顏色為紅色    paint.setColor(Color.RED);  }  @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    /**canvas畫直線，從左下角到右下角，this.getHeight()-2是獲得父edittext的高度，但是必須要-2這樣才能保證     * 畫的橫線在edittext上面，和原來的下劃線的重合     */    canvas.drawLine(0, this.getHeight()-2, this.getWidth()-2, this.getHeight()-2, paint);  }}