Resources class is for accessing an application's resources. This sits on top of the asset manager of the application (accessible through getAssets()) and provides a high-level API for getting typed data from the assets.
The Android resource system keeps track of all non-code assets associated with an application. You can use this class to access your application's resources. You can generally acquire the Resources instance associated with your application with getResources().
Implementation
1. Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
2. Add the following code to res/layout/activity_main.xml.
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/MainFrame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="172dp"
android:layout_x="12dp"
android:layout_y="26dp" />
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="172dp"
android:layout_x="20dp"
android:layout_y="184dp" />
</AbsoluteLayout>
3. Retrieve the resources from XML from .java file in the following way.
Button[] buttons;
for(int i=0; i<buttons.length; i++) {
{
String buttonID = "button" + (i+1);
int resID = getResources().getIdentifier(buttonID, "id", getPackageName());
buttons[i] = ((Button) findViewById(resID));
buttons[i].setOnClickListener(this);
}
getIdentifier(String name, String defType, String defPackage)
1. name: The name of the desired resource.
2. defType: Optional default resource type to find, if "type/" is not included in the name. Can be null to require an explicit type.
3. defPackage: Optional default package to find, if "package:" is not included in the name. Can be null to require an explicit package.
This definition can be changed and used for different components or even for different resources.
For example:
int resID = getResources().getIdentifier(editTextID, "id", getPackageName());
int resID = getResources().getIdentifier(checkboxID, "id", getPackageName());
int resID = getResources().getIdentifier(resourceName, "drawable", getPackageName());
int resID = getResources().getIdentifier(resourceName, "array", getPackageName());
int resID = getResources().getIdentifier(resourceName, "color", getPackageName());
And many more customizations!!
