Hello Readers! In this post, we are going to learn how to create and use android textSwitcher programmatically in any android application. We will also learn to add textSwitcher in linearLayout programmatically in any application.

Output

Tutorialwing Android Dynamic TextSwitcher Output

Getting Started

At first, we will create an android application. Then, we will use textSwitcher widget in the application.

1. Creating New Project

Follow the steps below to create a new project. Please ignore the steps if you have already created a new project.

Now, we will modify xml and java file to use android textSwitcher programmatically.

2. Modify values folder

Open res/values/strings.xml file and add below code into it.

<resources>
	<string name="app_name">DynamicTextSwitcher</string>
	<string name="next">Next</string>
</resources>

3. Modify Layout Folder

Open res/layout/activity_main.xml file. Then, add below code into it.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical">

	<Button
		android:id="@+id/button"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center"
		android:layout_marginTop="40dp"
		android:text="@string/next"/>

	<LinearLayout
		android:id="@+id/rootContainer"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:layout_marginTop="20dp"
		android:orientation="vertical">

	</LinearLayout>

</LinearLayout>

In activity_main.xml file, we have button and linearLayout, with id rootContainer, that will act as container for the textSwitcher created programmatically in the application.

4. Create Android TextSwitcher Programmatically / Dynamically

Open app/src/main/java/com.tutorialwing.dynamictextswitcher/MainActivity.java file and add below code into it.

package com.tutorialwing.dynamictextswitcher;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher;

public class MainActivity extends AppCompatActivity {

	final String[] textList = {"Panda", "Tiger", "Zebra", "Lion", "Deer", "Goat", "Ape", "Monkey", "Human"};
	int index = 0;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		final TextSwitcher textSwitcher = new TextSwitcher(this);
		textSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
			public View makeView() {
				TextView textView = new TextView(MainActivity.this);
				textView.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
				textView.setTextSize(32);
				textView.setTextColor(Color.RED);
				return textView;
			}
		});
		textSwitcher.setText(textList[index]);

		Animation in = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);
		textSwitcher.setInAnimation(in);

		Animation out = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right);
		textSwitcher.setOutAnimation(out);

		Button button = findViewById(R.id.button);
		button.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				index = ((index + 1) < textList.length) ? (index + 1) : 0;
				textSwitcher.setText(textList[index]);
			}
		});

		LinearLayout linearLayout = findViewById(R.id.rootContainer);
		if (linearLayout != null) {
			linearLayout.addView(textSwitcher);
		}
	}
}

We have created android textSwitcher programmatically in java file. Then, we have set factory for textSwitcher that creates views between which textSwitcher switches. After that, we have set animations that textSwitcher applies when it animates current text out and next text in. Then, we have set click listener on button to show next text whenever it is clicked. At last, we have added textSwitcher in linearLayout.

Since AndroidManifest.xml file is very important in any android project. We are also going to see the content inside this file.

AndroidManifest.xml file

Code inside src/main/AndroidManifest.xml file would look like below –

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamictextswitcher"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<application
		android:allowBackup="true"
		android:icon="@mipmap/ic_launcher"
		android:label="@string/app_name"
		android:roundIcon="@mipmap/ic_launcher_round"
		android:supportsRtl="true"
		android:theme="@style/AppTheme">
		<activity android:name=".MainActivity">
			<intent-filter>
				<action android:name="android.intent.action.MAIN"/>

				<category android:name="android.intent.category.LAUNCHER"/>
			</intent-filter>
		</activity>
	</application>

</manifest>

When we run the application, we will get output as shown above.

That’s the end of tutorial on Creating Android TextSwitcher Programmatically.