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您好，我正在尝试为我的相对布局设置 alpha 值，但是我遇到了错误，如何解决这个问题帮助我......
我的 xml 布局中有三个布局第一个布局用于背景第二个布局用于页眉第三个布局用于页脚。我想设置 alpha 值 2 & 3rd 布局所以我尝试了很多方法我仍然不知道请告诉如何设置 alpha 值
xml代码:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:orientation="vertical"
android:background="@drawable/blue">
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="60px"
android:orientation="horizontal"
android:layout_alignParentTop="true"
android:background="@drawable/gradient_black"
android:id="@+id/ttest">
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/header_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="6dp"
android:layout_toRightOf="@+id/imageView1"
android:text="settings"
android:textColor="@color/white"
android:textSize="20sp" />
</RelativeLayout>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="55px"
android:background="@drawable/gradient_black"
android:gravity="bottom"
android:orientation="horizontal"
android:layout_alignParentBottom="true" >
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ssss"
/>
</RelativeLayout>
</RelativeLayout>
代码:
public class DesignActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
int width = getWindowManager().getDefaultDisplay().getWidth();
int height = getWindowManager().getDefaultDisplay().getHeight();
ImageView imgHead = (ImageView)findViewById(R.id.imageView1);
ImageView imgbottom = (ImageView)findViewById(R.id.imageView2);
imgbottom.setImageResource(R.drawable.back);
imgbottom.setLayoutParams(new RelativeLayout.LayoutParams(width/8, height/8));
imgHead.setImageResource(R.drawable.b);
imgHead.setLayoutParams(new RelativeLayout.LayoutParams(width/8, height/8));
// RelativeLayout relative = (RelativeLayout)findViewById(R.id.ttest);
}
}