Android背景颜色变化

Question

This is the XML file blog.xml

 <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:id="@+id/info"
    android:layout_height="wrap_content" 
    android:orientation="vertical"
    android:background="#FFFFFF">
    </LinearLayout>

.java file

   super.onCreate(savedInstanceState);
        setContentView(R.layout.blog);
        View linearLayout =  findViewById(R.id.info);

        TextView valueTV = new TextView(this);
        valueTV.setText("hallo");
        valueTV.setId(5);
        valueTV.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));

        ((LinearLayout) linearLayout).addView(valueTV);
    }

Here i need the entire Activity to be turned white.But while compiling this program, the text written has white background.ie "hallo" word has the white background.

Please help.

Answer 1

It's because your LinearLayout in the XML has the height and width set to wrap_content . Change this to fill_parent to fill the whole activity. At the moment it is just wrapping the TextView .

Answer 2

change

android:layout_width="wrap_content"
android:layout_height="wrap_content" 

in your xml to

android:layout_width="fill_parent"
android:layout_height="fill_parent"

Answer 3

use this..

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:id="@+id/info"
    android:layout_height="fill_parent" 
    android:orientation="vertical"
    android:background="#FFFFFF">
    </LinearLayout>