Develop Reference

Android displaying pop-up message or animation on button click

I am really new to android programming, and I'm stuck with a really small problem in my app. The (very simple) app is almost ready, its just that there is a button and when it is clicked, I want the user to get a response in the form of either a message or some animation so that the user can feel that the app has registered the button click. I've been looking up and trying stackoverflow and other tutorials but to no avail. I just want some kind of a response when the button is clicked, so that the user doesn't feel confused about whether the app is working or not. Any help will be greatly appreciated!! Here's the code below:-
The XML file:-
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MyActivity"
android:background="#d1000000">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click Me"
android:id="#+id/Hinglishbutton"
android:background="#cfa16cff"
android:hapticFeedbackEnabled="true"
android:onClick="buttonHandler"
android:clickable="true"
android:textColor="#a5fafbf9"
tools:ignore="HardcodedText"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="71dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Welcome to Hinglish :)"
android:id="#+id/textView4"
android:textColor="#a5fafbf9"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="62dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hinglish lets you add Hindi words to your predictive dictionary thus enabling a richer typing experience!"
android:id="#+id/textView"
android:textColor="#a5fafbf9"
android:textIsSelectable="false"
android:textSize="14sp"
android:typeface="sans"
android:layout_marginTop="80dp"
android:layout_below="#+id/textView4"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click the button once, minimize Hinglish and go grab a coffee. You will now be able to type hindi words without autocorrect converting them to junk english!"
android:id="#+id/textView2"
android:textColor="#a5fafbf9"
android:textIsSelectable="false"
android:textSize="14sp"
android:typeface="sans"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Hosting this app costs money! To pitch in, contact the developer at spandan.madan#gmail.com :) :)"
android:id="#+id/textView5"
android:textColor="#a5fafbf9"
android:layout_below="#+id/textView2"
android:layout_alignRight="#+id/textView2"
android:layout_alignEnd="#+id/textView2"
android:layout_marginTop="43dp" />
</RelativeLayout>
The myActivity.java file:-
package com.example.spandanmadan1.hinglish;
import android.content.res.AssetManager;
import android.provider.UserDictionary;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class MyActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
Button bsubmit = (Button) findViewById(R.id.Hinglishbutton);
bsubmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(), "Thank you for using Hinglish", Toast.LENGTH_LONG).show();
InputStream fis = getResources().openRawResource(R.raw.hindislang);
BufferedReader bfr = null;
try {
bfr = new BufferedReader(new InputStreamReader(fis));
String line = null;
while ((line = bfr.readLine()) != null) {
UserDictionary.Words.addWord(getApplicationContext(), line, 1, "", null);
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_my, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

I created a new project, used your xml and in the buttonHandler function I gave the toast as follows:
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
public class MyActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
}
public void buttonHandler(View view) {
Toast.makeText(getApplicationContext(), "Thank you for using Hinglish", Toast.LENGTH_LONG).show();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_my, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
This works. The Toast : "Thank you for using Hinglish" was displayed on screen.

You can use a Toast:
Toast.makeText(getApplicationContext(),"<Your message to the User>",Toast.LENGTH_SHORT).show();
The message will be shown when you click the button.

How to change click event in android

Its been few days over to me, learning Android App development :
I have created an APK which is having two buttons (largeButton & smallButton) if you click on these button test will large and small accordingly.
What i am trying to do :
When i click second time button should change in previous mode i.e Vice Versa should happen.
Here is my code :
mainActivity:
package com.firstapk.helloworld;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button largButton;
Button smallButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
largButton = (Button) findViewById(R.id.largbutton);
smallButton = (Button) findViewById(R.id.smallbutton);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
//public void getDisplay(View view){
public void largebuttonclick(View view){
try{
largButton.setTextSize(40);
}catch(Exception e){
Log.d("TestApp", e.getMessage());
}
}
//}
public void smallButtonClick(View view){
try{
smallButton.setTextSize(5);
}catch(Exception e){
Log.d("TestApp",e.getMessage());
}
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
<Button
android:id="#+id/largbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:layout_marginTop="96dp"
android:onClick="largebuttonclick"
android:text="#string/button_large" />
<Button
android:id="#+id/smallbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:layout_marginTop="320dp"
android:onClick="smallButtonClick"
android:text="#string/button_small" />
</RelativeLayout>

As you did now it's right, if he click "Max size" he will see max size;
So maybe you want to use only one button which works like (+ and -)? If yes use one onClick and a boolean variable to save the current status (max size, small size).
private boolean maxSize; // false if small, true if max
public void onChangeSize(View view)
{
if (maxSize)//max->small
{
smallButton.setTextSize(5);
}
else//small->max
{
largButton.setTextSize(40);
}
maxSize = !maxSize;
}
Then android:onClick="onChangeSize" in the two buttons xml.
You could use the same approch for your current code, but it will work in the same way.

How to implement word spacing in textview in android by coding at runtime

does anybody has any idea to increase or decrease the word spacing in the text set on the textview in android. I want to do the word spacing and line spacing by providing any integer value...

May be this could help
By setting this property to your xml you can get it done
android:lineSpacingExtra

hi i had solved the problem of word spacing by replacing the single space by multiple spaces according to requirement. I am giving an example in which there are one textview and two button one is for increasing the space and one is for decreasing the space. the code is given below and used android:lineSpacingExtra for line spacing as suggested above.
package com.example.wordspacingexample;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
private TextView mTextView;
private Button mIncrease;
private Button mDecrease;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextView = (TextView) findViewById(R.id.textView1);
mIncrease = (Button) findViewById(R.id.btn_increase);
mDecrease = (Button) findViewById(R.id.btn_decrease);
mTextView.setTag(" ");
mIncrease.setOnClickListener(this);
mDecrease.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if (v.getId() == R.id.btn_increase) {
String space = (String) mTextView.getTag();
String text = mTextView.getText().toString();
mTextView.setText(text.replace(space, (space += " ")));
mTextView.setTag(space);
} else if (v.getId() == R.id.btn_decrease) {
String space = (String) mTextView.getTag();
String text = mTextView.getText().toString();
if (space.length() > 2) {
mTextView.setText(text.replace(space,
space = space.substring(0, space.length() - 2)));
mTextView.setTag(space);
} else if (space.length() == 2) {
mTextView.setText(text.replace(space, " "));
mTextView.setTag(" ");
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
This the code of the activity with the implementation.
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="#string/hello_world" />
<Button
android:id="#+id/btn_increase"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView1"
android:layout_centerHorizontal="true"
android:text="Click to increase word space" />
<Button
android:id="#+id/btn_decrease"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/btn_increase"
android:layout_centerHorizontal="true"
android:text="Click to decrease word space" />
Code of the xml file used. ScreenShots are given as:

Button OnClickListener not working

I am new to Android. I am trying to get input from the EditText and displaying it in TextView with the help of button. When I click the button nothing happens. Please help, here is my MainActivity.java code -
package com.example.addname;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
Button b1;
TextView v1;
EditText t1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = (Button) findViewById(R.id.button1);
t1 = (EditText) findViewById(R.id.editText1);
v1 = (TextView) findViewById(R.id.textView1);
b1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(t1.getText().toString()=="")
{
v1.setText(t1.getText().toString());
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
and here is my activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/hello_world" />
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="25dp"
android:ems="10" >
<requestFocus />
</EditText>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="#+id/textView1"
android:layout_below="#+id/editText1"
android:layout_marginTop="48dp"
android:text="Button" />
</RelativeLayout>

Instead of
if(t1.getText().toString()=="")
{
v1.setText(t1.getText().toString());
}
You can use
if(t1.getText().isEmpty()) // isEmpty() is only available from API 9 and Above
{
v1.setText(t1.getText().toString());
}
or this
if(t1.getText().trim().length == 0)
{
v1.setText(t1.getText().toString());
}
Don't compare strings using ==. You're actually comparing reference of an object. To compare strings, use equals() method.

I'd recommend comparing strings with .equals() since Objects compared with == usually fails (== compares references, not Object content).
if(t1.getText().toString().equals("")))
in your case though,since you're comparing an empty String, you can also use
if (t1.getText().toString().length == 0)
Then note that once you set the text, you're setting v1's text to an empty string since your logic indicates that only upon an empty string you set v1's text. So I'd recommend getting rid of the if altogether:
#Override
public void onClick(View arg0) {
v1.setText(t1.getText().toString());
}

Android - onKey events don't fire

I'm having a problem where it seems I can't get key events to fire at all in the emulator (it was working before, but, somehow.. something broke).
Here is some sample code that should fill the second text box with the text of the first when a key is pressed in the first (or if the button is clicked). But it doesn't do that.
Am I doing something wrong?
Activity class:
package abc.def;
import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.widget.Button;
import android.widget.EditText;
public class Fill extends Activity {
/** Called when the activity is first created. */
EditText e1;
EditText e2;
Button b;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
e1 = (EditText) findViewById(R.id.EditText01);
e2 = (EditText) findViewById(R.id.EditText02);
b = (Button) findViewById(R.id.Button01);
e1.setOnKeyListener(new OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
e2.setText(e1.getText());
return false;
}
});
b.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
e2.setText(e1.getText());
}
});
}
}
Layout file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello"
/>
<EditText android:text="" android:id="#+id/EditText01" android:layout_width="wrap_content" android:layout_height="wrap_content"></EditText>
<EditText android:text="" android:id="#+id/EditText02" android:layout_width="wrap_content" android:layout_height="wrap_content"></EditText>
<Button android:text="Click" android:id="#+id/Button01" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
</LinearLayout>

You should use e1.getText().toString() to get result.
LogCat will be useful to find out the values that are passed around. You can add the following LogCat for finding out similar issues
Log.d("SOMENAME",e1.getText().toString);

I got this to work by implementing TextWatcher and using addTextChangedListener() instead. No clue why this works when the onKeyListener does not - I suspect the keyboard events aren't even reaching my widget for some reason..