Develop Reference

App force close when changing items in StringArray, Android?

right now I'm working on a app which changes items in StringArray on button clicks. I've implemented left and right buttons, when I click right button the item changes by right, when I press left the item changes to left. Up to here everything is fine, but when I click left button when the item is on Steve Jobs the app force closes. Any idea why this is happening?
Strings.xml:
<string name="sj">Steve Jobs</string>
<string name="mz">Mark Zuckerberg</string>
<string name="bg">Bill Gates</string>
<string name="lp">Larry Page</string>
<string-array name="gl">
<item>#string/sj</item>
<item>#string/mz</item>
<item>#string/bg</item>
<item>#string/lp</item>
</string-array>
MainActivity.java:
package com.example.theatremode;
import android.support.v7.app.ActionBarActivity;
import android.content.res.Resources;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity implements OnClickListener {
int counter = 0;
TextView tv1;
Button button1;
Button button2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1 = (TextView) findViewById(R.id.tv1);
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
Resources res = getResources();
final String[] list = res.getStringArray(R.array.gl); // get the array
((TextView) findViewById(R.id.tv1)).setText(list[counter]); // set the
// initial
// message.
button1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
TextView tx = (TextView) findViewById(R.id.tv1);
counter++;
if (counter >= list.length)
counter = 0;
tx.setText(list[counter]); // set the new message.
}
});
Resources res2 = getResources();
final String[] list2 = res2.getStringArray(R.array.gl); // get the array
((TextView) findViewById(R.id.tv1)).setText(list2[counter]);
button2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
TextView tx2 = (TextView) findViewById(R.id.tv1);
counter--;
if (counter >= list2.length)
counter = 0;
tx2.setText(list2[counter]); // set the new message.
}
});
}
#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;
}
#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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
}
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="com.example.theatremode.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25sp"
android:id="#+id/tv1"/>
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button1"
android:layout_alignBottom="#+id/button1"
android:layout_alignLeft="#+id/tv1"
android:text="Left" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="48dp"
android:layout_marginRight="14dp"
android:text="Right" />

Looks like you have a IndexOutOfBoundsException.
It's not obvious exactly what's going on here, but this might fix it:
button2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
TextView tx2 = (TextView) findViewById(R.id.tv1);
counter--;
//if (counter >= list2.length)
//counter = 0;
if (counter < 0)
counter = list2.length - 1;
tx2.setText(list2[counter]); // set the new message.
}
});

show EditText on condition

Right now I have an idea for a project and I would like to know if anyone can help me on the same logic.
As such I need to create or generate a number of EditText according to amount you enter, ie, to select or enter a number such as 5, show me 5 EditText layout for type 5 values​​. They know that the form could accomplish this? Any ideas please?
I guess it must be a way to do it with a loop, but not like carrying this calculation Java to XML. Thank you.

Here is an example of generating EditText items based on the number you enter. You can ignore the scrollview in the layout file I just put it in case someone added a lot of EditText items that would go off the screen.
MainActivity.java
package com.example.test;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;
public class MainActivity extends Activity {
public static final String TAG = MainActivity.class.getSimpleName();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText count = (EditText) findViewById(R.id.count);
final TextView output = (TextView) findViewById(R.id.output);
final Button generate = (Button) findViewById(R.id.generate);
final Button values = (Button) findViewById(R.id.values);
final LinearLayout container = (LinearLayout) findViewById(R.id.container);
generate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int numberOfControlsToGenerate = 0;
try {
numberOfControlsToGenerate = Integer.parseInt(count.getText().toString().trim());
} catch (NumberFormatException e) {
Log.e(TAG, e.getMessage(), e);
}
if (numberOfControlsToGenerate > 0) {
if (container.getChildCount() > 0) {
container.removeAllViews();
}
for (int counter = 0; counter < numberOfControlsToGenerate; counter++) {
addEditText(container);
}
}
}
});
values.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String[] editTextValues = new String[container.getChildCount()];
StringBuilder editTextValuesBuilder = new StringBuilder();
for (int counter = 0; counter < container.getChildCount(); counter++) {
EditText child = (EditText) container.getChildAt(counter);
editTextValues[counter] = child.getText().toString().trim();
editTextValuesBuilder.append(editTextValues[counter]).append("\n");
}
output.setText(editTextValuesBuilder.toString());
}
});
}
private void addEditText(LinearLayout container) {
final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
EditText editTextToAdd = new EditText(this);
editTextToAdd.setLayoutParams(params);
container.addView(editTextToAdd);
}
}
activity_main.xml
<LinearLayout 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:gravity="center_horizontal"
android:orientation="vertical"
android:padding="16dp"
tools:context="${packageName}.${activityClass}" >
<EditText
android:id="#+id/count"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:imeOptions="actionDone"
android:inputType="number"
android:textSize="20sp" />
<Button
android:id="#+id/generate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Go" />
<Button
android:id="#+id/values"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Values" />
<TextView
android:id="#+id/output"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
</LinearLayout>
</ScrollView>
</LinearLayout>

Android onclick Buttons Sequence

I have 5 buttons every one has letter (Button "H",Button "E"Button "L"Button "L"Button "O") which make the word "HELLO". what I need is to make on click sequence to these buttons so if I click "H" first and "E" second until complete the word the app will do something, But if I click "L" first will give me some error message.
Any Idea to do this sequence?
Thanks

Just have an Array like this:
int[] tracker = new int[5];
and when you click a button, say "H", set tracker[0] = 1;
but when you click a button, say "L", check whether all the previous button values are 1. If yes, then set the corresponding tracker to 1 else, show an error message, and do not make any change to the tracker Array.
Something Like this:
onHClick{
tracker[0] = 1;
}
onEClick{
for(int i=0; i<1; i++){
if(tracker[i] == 0){
//show error message and return;
}else{
tracker[1] = 1;
return;
}
}
}

You can do something like
When activity started you just make other button Enabled = false of something like that. But make the first button Enabled. Don't make the Visible=false.
Now on click of Button "H" make enable Button "E" and so on.
So user will only have to click the button in sequence. Button can not be presses in any random manner.
Try this and let me know that it works or not.

Very Interesting and exactly same to your requirement..check once..
If you give any string other than HELLO also works better.
public class ButtonTest extends Activity
{
private String result="";
String sampleText = "HELLO";
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.test);
int noOfBtns = sampleText.length();
LinearLayout ll = (LinearLayout)findViewById(R.id.btnlay);
final TextView tvtext = (TextView)findViewById(R.id.result);
final Button[] btns = new Button[noOfBtns];
for(int i=0;i<noOfBtns;i++)
{
btns[i] = new Button(this);
btns[i].setText(sampleText.substring(i,i+1));
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
ll.addView(btns[i], lp);
final int j = i;
btns[i].setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
System.out.println(j+" "+result.length());
if(j == result.length())
{
result = result+btns[j].getText().toString();
if(sampleText.startsWith(result))
{
tvtext.setText(result);
}
}
else
{
Toast.makeText(getApplicationContext(), "Wrong Button Pressed", Toast.LENGTH_SHORT).show();
}
}
});
}
}
}
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:id="#+id/result"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:textColor="#fff"/>
<LinearLayout
android:id="#+id/btnlay"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal">
</LinearLayout>
</LinearLayout>

Try the following
package com.example.buttonsequence;
import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity
{
ArrayList<Button> buttonList=null;
TextView resultTextView=null;
Button buttons[]=null;
String helloStr="HELLO";
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonList=new ArrayList<Button>();
buttons=new Button[5];
this.resultTextView=(TextView) this.findViewById(R.id.result_text);
this.resultTextView.setText("");
buttons[0]=(Button)this.findViewById(R.id.h_button);
buttons[1]=(Button)this.findViewById(R.id.e_button);
buttons[2]=(Button)this.findViewById(R.id.l_button);
buttons[3]=(Button)this.findViewById(R.id.l2_button);
buttons[4]=(Button)this.findViewById(R.id.o_button);
for(int k=0;k<5;k++)
buttons[k].setOnClickListener(onClickListener);
Button button=(Button)this.findViewById(R.id.exit_button);
button.setOnClickListener
(
new OnClickListener()
{
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
finish();
}
}
);
}
OnClickListener onClickListener=new OnClickListener()
{
#Override
public void onClick(View v)
{
// TODO Auto-generated method stub
Button b=(Button)v;
buttonList.add(b);
int size=buttonList.size();
if(size>0)
{
StringBuilder resultBuilder=new StringBuilder();
for(int i=0;i<size;i++)
{
Button tempButton=buttonList.get(i);
if(tempButton==buttons[i])
{
resultBuilder.append(helloStr.charAt(i));
if(i==4)
{
resultTextView.setText(resultBuilder.toString()+" clicked");
buttonList.clear();
}
else
{
resultTextView.setText(resultBuilder.toString()+" clicked");
}
}
else
{
buttonList.remove(i);
Toast.makeText(getApplicationContext(), "No correctly clicked", Toast.LENGTH_SHORT).show();
break;
}
}
}
else
{
resultTextView.setText("Invalid pressed");
}
}
};
}
activity_main.xml
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
<Button
android:id="#+id/h_button"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="H" />
<Button
android:id="#+id/e_button"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="E" />
<Button
android:id="#+id/l_button"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="L" />
<Button
android:id="#+id/l2_button"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="L" />
<Button
android:id="#+id/o_button"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="O" />
<TextView
android:id="#+id/result_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Small Text"
android:textAppearance="?android:attr/textAppearanceSmall" />
<Button
android:id="#+id/exit_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Exit" />
</LinearLayout>

I don't know exactly your flow but you can try this.
set Tag to each button as its Text, like this.
b.setTag("H");
and than after like this.
Button b;
String name = "";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String s = (String) v.getTag();
name +=s;
if( "HELLO".startsWith(name)){
<VALID>
}else{
<ERROR>
}
}
});
}
check the variable name on each button click with your original word i.e. HELLO like above.

Delete button in TableRow

I have an Edit button in my header. And I populating my TableLayout in a loop. In The loop I am inflating a Delete button.
Following is the code I have used :
MainActivity :
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.cookbooklist);
btnHeaderEdit = (Button)findViewById(R.id.btnEdit);
btnHeaderEdit.setVisibility(View.VISIBLE);
delete_button = (View)findViewById(R.id.btnDelete);
listTable = (TableLayout)findViewById(R.id.cookbookListTable);
btnHeaderEdit.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
delete_button.getTag();
delete_button.setVisibility(View.VISIBLE);
}
});
for(int i=0;i<=10;i++)
{
// Row to display news title
final TableRow newsRow = new TableRow(this);
newsRow.setMinimumHeight(200);
newsRow.setClickable(true);
newsRow.setTag(i);
newsRow.setBackgroundColor(Color.WHITE);
// Some other views
//create inflater
LayoutInflater inflater = getLayoutInflater();
delete_button = inflater.inflate(R.layout.deletebutton,
(ViewGroup) newsRow, false);
delete_button.setTag(i);
delete_button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
listTable.removeView(newsRow);
}
});
//Add views in table
newsRow.addView(delete_button);
listTable.addView(newsRow);
}
}
delebutton.xml :
<Button
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/btnDelete"
android:layout_width="100dip"
android:visibility="invisible"
android:layout_height="40dip"
android:padding="10sp"
android:text="Delete">
</Button>
Question :
The problem I am facing is that when I click the Edit button in header, Delete button appears only in the last row. When I setVisibility of Delete button to Visible in layout, it appears in all rows. But I want it to be invisible in the start. And on clicking the Edit button it should appear in all rows. I Am wondering how to achieve that.
Can someone assist me? Let me know if more code is needed.
Thanks
The problem I am facing is that when

Hi Stone i think you have to use a boolean flag. which wil determine whether the delete button should be visible or not. Try with the following example. Its working fine. On click of edit button if delete buttons are invisible i make all as visible and viceversa. Try the following code.
See My Working Example
Sample2.java
import java.util.ArrayList;
import java.util.Iterator;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Sample2 extends Activity {
boolean showDeleteButtonFlag = false;
Button delteBtn2 = null;
Button delteBtn1 = null;
Button editBtn = null;
ArrayList<Button> deleteButtonList = new ArrayList<Button>();
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.tablerow);
delteBtn1 = (Button) findViewById(R.id.delete1);
delteBtn2 = (Button) findViewById(R.id.delete2);
// add all delete buttons buttons to the array list
deleteButtonList.add(delteBtn1);
deleteButtonList.add(delteBtn2);
editBtn = (Button) findViewById(R.id.edit);
setVisibilityOfDeleteButtons();
editBtn.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// if delete button is visible make it as invisible and viceversa
showDeleteButtonFlag = !showDeleteButtonFlag;
setVisibilityOfDeleteButtons();
}
});
}
void setVisibilityOfDeleteButtons(){
if(showDeleteButtonFlag){
Iterator<Button> itr =deleteButtonList.iterator();
while(itr.hasNext()){
itr.next().setVisibility(View.VISIBLE);
}
}else{
Iterator<Button> itr =deleteButtonList.iterator();
while(itr.hasNext()){
itr.next().setVisibility(View.INVISIBLE);
}
}
}
}
tablerow.xml
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TableRow>
<Button
android:id="#+id/edit"
android:layout_width="100dip"
android:layout_height="60dip"
android:text="Edit" />
<Button
android:id="#+id/delete1"
android:layout_width="100dip"
android:layout_height="60dip"
android:text="Delete" />
</TableRow>
<TableRow>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Password:"
android:textColor="#ffffff"
android:textStyle="bold" />
<Button
android:id="#+id/delete2"
android:layout_width="100dip"
android:layout_height="60dip"
android:text="Delete" />
</TableRow>
</TableLayout>

codes in onClickListener can't be executed

I'm experiencing problem with the following code, I created two buttons with onClickListener added.
It works fine for the Button -- btnAbout, I'm trying to use another way to handle btnIntro, instead of by using findViewById(...) method, but the statement will not be executed when I click btnIntro.
Why does this happen?
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class TestActivity extends Activity {
private final String TAG = "tag";
private Button btnIntro;
private Button btnAbout;
private View layoutView;
private ViewWrapper wrapper;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnAbout = (Button) findViewById(R.id.btnAbout);
if (btnIntro == null) {
LayoutInflater inflator = getLayoutInflater();
layoutView = inflator.inflate(R.layout.main, null, false);
wrapper = new ViewWrapper(layoutView);
layoutView.setTag(wrapper);
} else {
wrapper = (ViewWrapper) layoutView.getTag();
}
btnIntro = wrapper.getButton();
Log.e(TAG, Integer.toHexString(layoutView.getId()) + "");
Log.e(TAG, btnIntro.getText().toString());
btnIntro.setOnClickListener(new OnClickListener() {
{
Log.e(TAG, "static");
}
#Override
public void onClick(View arg0) {
Log.e(TAG, "btnIntro clicked");
Toast.makeText(TestActivity.this, "btnIntro", Toast.LENGTH_SHORT)
.show();
}
});
btnAbout.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Log.e(TAG, "btnAbout clicked");
Toast.makeText(TestActivity.this, "about", Toast.LENGTH_SHORT).show();
}
});
}
class ViewWrapper {
View base;
Button btn1;
ViewWrapper(View base) {
this.base = base;
}
Button getButton() {
if (btn1 == null) {
btn1 = (Button) base.findViewById(R.id.btnIntro);
Log.e(TAG, btn1.getText().toString());
}
return btn1;
}
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/MAIN_LAYOUT_XML"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="30dip">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Test" />
<Button
android:id="#+id/btnIntro"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="btnIntro" />
<Button
android:id="#+id/btnAbout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="btnAbout" />
</LinearLayout>

Problem is that you use to different content views to obtain buttons, one is created when you invoke setContentView() and second you create by invoking inflator.infate(). Thus buttons you get are placed in different content views (only one of which is shown - that created by setContentView). Try that instead:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LayoutInflater inflator = getLayoutInflater();
layoutView = inflator.inflate(R.layout.main, null, false);
setContentView(layoutView);
//..anything you need..
}