Adding Margins to a dynamic Android TextView

问题

I've looked through a heap of previous answers on this , and tried the code marked as working, but so far nothing I do can convince the TextView I'm creating at runtme from filling the screen completely from left to right. I want to add a margin on both sides similar to a regular Toast. After that I can add a drop shadow to the shape.

Here my form layout.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rel_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/tv1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:gravity="center_vertical|center_horizontal"
        android:text="@string/hello_world"
        android:textColor="@color/holobrightblue"
        android:textSize="48sp"
        android:textStyle="bold"
        tools:context=".MainActivity" />

</RelativeLayout>

.. and my code

textView = new TextView(m_Context);
RoundRectShape rs = new RoundRectShape(new float[] { 10, 10, 10, 10, 10, 10, 10, 10 }, null, null);

ShapeDrawable sd =  new ShapeDrawable(rs);
sd.setAlpha(m_opacity);
textView.setBackgroundDrawable(sd);             
textView.setTextColor(m_txtcolor);  
textView.setText(toasttitle+"\n"+toastmessage);
textView.setBackgroundColor(Color.BLACK);
textView.setPadding(10,10,10,10);

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);


lp.setMargins(60, 0, 60, 0);          
textView.setLayoutParams(lp);

toastView = new Toast(m_Context);
toastView.setView(textView);
toastView.setDuration(m_toastlen);
toastView.setGravity(m_screengravity, 0,0);
toastView.show();

As mentioned, nothing I've tried from other solutions seems to convince the textview from filling all the horizonal space.

I've tried removing that shape etc...

Any ideas?

回答1:

You will need the holder RelativeLayout which will contain your TextView,

and then you can set the holder's Gravity to CENTER

RelativeLayout head2 = new RelativeLayout(this);
head2.setId(++myid);
RelativeLayout.LayoutParams head2Params = new RelativeLayout.LayoutParams(
        LayoutParams.FILL_PARENT, 25);
head2Params.addRule(RelativeLayout.BELOW, head1.getId());
head2.setLayoutParams(head2Params);
head2.setBackgroundColor(Color.CYAN);

then your create TextView

textView = new TextView(m_Context);
RoundRectShape rs = new RoundRectShape(new float[] { 10, 10, 10, 10, 10, 10, 10, 10 }, null, null);

ShapeDrawable sd =  new ShapeDrawable(rs);
sd.setAlpha(m_opacity);
textView.setBackgroundDrawable(sd);             
textView.setTextColor(m_txtcolor);  
textView.setText(toasttitle+"\n"+toastmessage);
textView.setBackgroundColor(Color.BLACK);
textView.setPadding(10,10,10,10);

LinearLayout.LayoutParams lp = new
   LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
                                          ^^^^^^^^^^^^
                                          ^^^^^^^^^^^^MUST  EDIT
lp.setMargins(60, 0, 60, 0);          
textView.setLayoutParams(lp);

then add your Textview to holder relativeLayout with Center Gravity

head2.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
head2.addView(textView);

Show it

toastView = new Toast(m_Context);
toastView.setView(textView);
toastView.setDuration(m_toastlen);
toastView.setGravity(m_screengravity, 0,0);

回答2:

This is the easy code to set textview ( text ) to given margins ,

LayoutParams lp = new LayoutParams(text.getWidth(), text.getHeight());
        lp.setMargins(5, 5, 0, 5);
        text.setLayoutParams(lp);

Parameters of setMargins() are as :

LayoutParams.setMargins(int left,int top , int right,int bottom)

setLayoutParams take Object of LayoutParams as parameter

来源：https://stackoverflow.com/questions/11757860/adding-margins-to-a-dynamic-android-textview