4154 views.Frame Layout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that’s scalable to different screen sizes without the children overlapping each other.
You can, however, add multiple children to a FrameLayout and control their position within the FrameLayout by assigning gravity to each child, using the android:layout_gravity attribute.
FrameLayout Attributes
Following are the important attributes specific to FrameLayout –
android:id
This is the ID which uniquely identifies the layout.
android:foreground
This defines the drawable to draw over the content and possible values may be a color value, in the form of “#rgb”, “#argb”, “#rrggbb”, or “#aarrggbb”.
android:foregroundGravity
Defines the gravity to apply to the foreground drawable. The gravity defaults to fill. Possible values are top, bottom, left, right, center, center_vertical, center_horizontal etc.
android:measureAllChildren
Determines whether to measure all children or just those in the VISIBLE or INVISIBLE state when measuring. Defaults to false.
MainActivity.java
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package com.example.demo; import android.os.Bundle; import android.app.Activity; import android.view.Menu; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } } |
Following will be the content of res/layout/activity_main.xml file −
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<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ImageView android:src="@drawable/ic_launcher" android:scaleType="fitCenter" android:layout_height="250px" android:layout_width="250px"/> <TextView android:text="Frame Demo" android:textSize="30px" android:textStyle="bold" android:layout_height="fill_parent" android:layout_width="fill_parent" android:gravity="center"/> </FrameLayout> |
Following will be the content of res/values/strings.xml to define two new constants −
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<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">demo</string> <string name="action_settings">Settings</string> </resources> |
Let’s try to run our modified Hello World! application we just modified. I assume you had created your AVD while doing environment setup. To run the app from Android Studio, open one of your project’s activity files and click Run icon from the toolbar. Android Studio installs the app on your AVD and starts it and if everything is fine with your setup and application, it will display following Emulator window −
