In
This Tutorial we are going to see to display the text to left side, Right side,
center, changing the color has you enter and the text can be visible randomly
through out the screen in various colors.Let Start....
OutPut Of the Tutorial:
Create Android Application:
- File >> New >> Android
Application
- Enter Project name: TextPlayApp
- Pakcage: com.ambilpursunil.newapp
- Keep other
default selections, click Next until you reach Finish
2.Copy and past the following code in the MainAcivity.java
package com.ambilpursunil.newapp;
import java.util.Random;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.drawable.GradientDrawable;
import android.os.Bundle;
import android.text.InputType;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.ToggleButton;
public class TextPlay extends Activity implements View.OnClickListener {
/*
* when we implements any class then we
must(compulsory) implement all the
* method of that class. if we entends
then we can r cant implement all the
* methods of that class
*/
Button chkCmd;
ToggleButton passTog;
EditText input;
TextView display;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.text);
baconAndEggs();
passTog.setOnClickListener(this);
chkCmd.setOnClickListener(this);
}
private void baconAndEggs() {
// TODO Auto-generated method stub
chkCmd = (Button) findViewById(R.id.bResults);
passTog = (ToggleButton) findViewById(R.id.tbPassword);
input = (EditText) findViewById(R.id.etCommand);
display = (TextView) findViewById(R.id.tvResults);
}
}
@Override
public void onClick(View view) {
// TODO Auto-generated method stub
switch (view.getId()) {
case R.id.bResults:
String
check = input.getText().toString();
display.setText(check);
if (check.contentEquals("left")) {
display.setGravity(Gravity.LEFT);
}else if (check.contentEquals("center")) {
display.setGravity(Gravity.CENTER);
}
else if (check.contentEquals("right")) {
display.setGravity(Gravity.RIGHT);
}
else if (check.contentEquals("red")) {
display.setTextColor(Color.RED);
}
else if (check.contains("WTF")) {
Random
crazy = new Random();
display.setText("WTF!!!!");
display.setTextSize(crazy.nextInt(75));
display.setTextColor(Color.rgb(crazy.nextInt(265),
crazy.nextInt(265),
crazy.nextInt(265)));
switch (crazy.nextInt(3)) {
case 0:
display.setGravity(Gravity.LEFT);
break;
case 1:
display.setGravity(Gravity.CENTER);
break;
case 2:
display.setGravity(Gravity.RIGHT);
break;
}
}
else {
display.setText("invalid");
display.setGravity(Gravity.CENTER);
display.setTextColor(Color.BLACK);
}
break;
case R.id.tbPassword:
if (passTog.isChecked())
{
input.setInputType(InputType.TYPE_CLASS_TEXT
|
InputType.TYPE_TEXT_VARIATION_PASSWORD);
}
else {
input.setInputType(InputType.TYPE_CLASS_TEXT);
}
break;
}
}
}
2.Change the activity_main.xml file as the below
<?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"
android:padding="25dp" >
<EditText
android:id="@+id/etCommand"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="Hello Come On"
android:password="true" />
<!--
Difference Between
android:hint and android:text is hint cant be visible by clicking on the box we
can type
what ever we want like
username,pwd. but in case of text it will appear in field and if we want to
type we have
to erase the text in
the field and we need to type.
android:password used
to display text in term of password like ****** in the field
-->
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="100" >
<Button
android:id="@+id/bResults"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="20"
android:text="Button" />
<ToggleButton
android:id="@+id/tbPassword"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="80"
android:checked="true"
android:gravity="center"
android:paddingBottom="10dp"
android:text="ToggleButton" />
</LinearLayout>
<TextView
android:id="@+id/tvResults"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="TextView" />
</LinearLayout>
3.Copy and past the code into the manifest.xml file as the below
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ambilpursunil.newapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.ambilpursunil.newapp.TextPlay"
android:configChanges="keyboard|keyboardHidden|orientation" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
4. Right click on the Project and Choose --->Run As-->Android Application as observer the OutPut:
There is one edittext, one button, toggle button and a textview are there on the screen Just type right or left or center in the edit text and click on the toggle button ON the you will the right in the edittext if you click the toggle button as OFF the text in the edit text will be change to password format, after entering the text as Right in the edittext click on the button the that text will appear on right same it will work for Left and center also.
If you enter Red in the Edit text the text will appear as red.
If You ente WTF in cap in the edit text and click continously on the button then you will observe The text WTF will appear in randomly through the screen in different color.
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