[英]How to use ruled/horizontal lines to align text in EditText in Android?
[英]Multiline Edittext with Horizontal Lines
我正在做一個分配,不知道如何按照此教程添加多行edittext,但是不知道如何在MainActivity類中實現它
我正在使用以下課程
public class LinedEditText extends EditText {
private Rect mRect;
private Paint mPaint;
// we need this constructor for LayoutInflater
public LinedEditText(Context context, AttributeSet attrs) {
super(context, attrs);
mRect = new Rect();
mPaint = new Paint();
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
// mPaint.setColor(getResources().getColor()); //SET YOUR OWN COLOR HERE
}
@Override
protected void onDraw(Canvas canvas) {
//int count = getLineCount();
int height = getHeight();
int line_height = getLineHeight();
int count = height / line_height;
if (getLineCount() > count)
count = getLineCount();//for long text with scrolling
Rect r = mRect;
Paint paint = mPaint;
int baseline = getLineBounds(0, r);//first line
for (int i = 0; i < count; i++) {
canvas.drawLine(r.left, baseline + 1, r.right, baseline + 1, paint);
baseline += getLineHeight();//next line
}
super.onDraw(canvas);
}
}
我有以下XML視圖想要通過此類來膨脹它們
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:id="@+id/main_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
</LinearLayout>
multilinedittext.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/multiline_exdittext_layout"
android:layout_width="match_parent" android:layout_height="match_parent">
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="textMultiLine"
android:ems="10"
android:id="@+id/edittxt_multilines"
/>
</LinearLayout>
嘗試這個
<EditText
android:inputType="textMultiLine"
android:lines="8"
android:minLines="6"
android:gravity="top|left"
android:maxLines="10"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:scrollbars="vertical"
/>
將您的xml更改為此
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/multiline_exdittext_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<your.packagename.LinedEditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="textMultiLine"
android:ems="10"
android:id="@+id/edittxt_multilines"
/>
</LinearLayout>
您的自定義類是public class LinedEditText extends EditText
只需更改您的EditText Xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/multiline_exdittext_layout"
android:layout_width="match_parent" android:layout_height="match_parent">
<YOUR_PACKAGE_NAME.LinedEditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:inputType="textMultiLine"
android:ems="10"
android:id="@+id/edittxt_multilines"
/>
</LinearLayout>
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