So I have a ListView in my activity_main.xml. Also a TextView in a different xml da_item.xml.
The textview is for the individual listview items.
Now in my code there is a onContextItemSelected() function which calls bucketMarkItem(long itemTitle). bucketMarkItem(long itemTitle) changes the last item's background color using function colorCorrection().
The whole code works fine.
But I have a button with enterItem() onClick listener. I call the same colorCorrection() from inside enterItem() and the app crashes.
It crashes on this line.
TextView txtDep1=(TextView)listItemBla1.findViewById(R.id.tv);
And I have no idea why.
I've seen many question like this and the answer was to use setContentView(R.layout.activity_main) but I've already included this.
onContextItemSelected Code
@Override
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
super.onContextItemSelected(item);
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
long hula = info.id;
if(item.getTitle()=="Mark as Done"){
bucketMarkItem(hula);
}
if(item.getTitle()=="Mark as Undone"){
bucketUnMarkItem(hula);
}
if(item.getTitle()=="Delete Item"){
bucketDeletelistItem(hula);
}
return true;
}
bucketMarkItem() Code
private void bucketMarkItem(long itemTitle) {
// TODO Auto-generated method stub
View listItemBla=(View)list.getChildAt((int)(long)itemTitle);
TextView txtDep=(TextView)listItemBla.findViewById(R.id.tv);
txtDep.setBackgroundColor(Color.GREEN);
String txtDepText = ""+txtDep.getText();
String[] result = txtDepText.split(" ");
String result1 = result[1];
Cursor cursor = myDB.getAllRows();
if(cursor.moveToFirst()){
do{
if(result1.equals(cursor.getString(1))){
long yourDBID = yourDB.insertRow(cursor.getInt(0));
}
}while(cursor.moveToNext());
}
cursor.close();
colorCorrecton();
}
colorCorrecton Code
private void colorCorrecton() {
Toast.makeText(MainActivity.this,""+ list.getCount(), Toast.LENGTH_SHORT).show();
View listItemBla1=(View)list.getChildAt((list.getCount()-1));
TextView txtDep1=(TextView)listItemBla1.findViewById(R.id.tv);
Toast.makeText(MainActivity.this, ""+txtDep1.getText(), Toast.LENGTH_SHORT).show();
txtDep.setBackgroundColor(Color.GREEN);
}
enterItem() Code
public void enterItem(View v) {
// TODO Auto-generated method stub
EditText dataEntry_EditText=(EditText)findViewById(R.id.editText1);
Editable dataEntry_Editable = dataEntry_EditText.getText();
String dataEntry_Finaldata = dataEntry_Editable.toString();
long newId = myDB.insertRow(dataEntry_Finaldata, 233, "red");
//Toast.makeText(MainActivity.this, dataEntry_Finaldata, Toast.LENGTH_LONG).show();
dataEntry_EditText.setText("");
populateListView();
//Toast.makeText(MainActivity.this, ""+list.getCount(), Toast.LENGTH_LONG).show();
colorCorrecton();
}
Complete Code
package com.example.bucketlist;
import java.util.ArrayList;
import android.support.v4.app.FragmentActivity;
import android.text.Editable;
import android.database.Cursor;
import android.graphics.Color;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends FragmentActivity {
ListView list;
DBAdapter myDB;
DBAdapter1 yourDB;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView bucketMenu = (ImageView)findViewById(R.id.bucketMenuW);
list= (ListView)findViewById(R.id.listView1);
registerForContextMenu(list);
openDB();
populateListView();
//colorCorrecton();
}
private void colorCorrecton() {
Toast.makeText(MainActivity.this,""+ list.getCount(), Toast.LENGTH_SHORT).show();
View listItemBla1=(View)list.getChildAt((list.getCount()-1));
TextView txtDep1=(TextView)listItemBla1.findViewById(R.id.tv);
Toast.makeText(MainActivity.this, ""+txtDep1.getText(), Toast.LENGTH_SHORT).show();
//txtDep.setBackgroundColor(Color.GREEN);
}
public void conMenu(View v) {
// TODO Auto-generated method stub
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
super.onCreateContextMenu(menu, v, menuInfo);
if(v.getId()==R.id.listView1){
menu.add("Mark as Done");
menu.add("Mark as Undone");
menu.add("Delete Item");
}
}
@Override
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
super.onContextItemSelected(item);
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
long hula = info.id;
if(item.getTitle()=="Mark as Done"){
bucketMarkItem(hula);
}
if(item.getTitle()=="Mark as Undone"){
bucketUnMarkItem(hula);
}
if(item.getTitle()=="Delete Item"){
bucketDeletelistItem(hula);
}
return true;
}
private void bucketUnMarkItem(long itemTitle) {
// TODO Auto-generated method stub
View listItemBla=(View)list.getChildAt((int)(long)itemTitle);
TextView txtDep=(TextView)listItemBla.findViewById(R.id.tv);
String txtDepText = ""+txtDep.getText();
String[] result = txtDepText.split(" ");
String result1 = result[1];
Cursor cursor = myDB.getAllRows();
int markID=0;
if(cursor.moveToFirst()){
do{
if(result1.equals(cursor.getString(1))){
markID = cursor.getInt(0);
}
}while(cursor.moveToNext());
}
cursor.close();
//Toast.makeText(MainActivity.this, ""+list.getCount(), Toast.LENGTH_LONG).show();
Cursor cursor1 = yourDB.getAllRows();
if(cursor1.moveToFirst()){
do{
if(markID == cursor1.getInt(1)){
boolean newid2 = yourDB.deleteRow(cursor1.getInt(0));
}
}while(cursor1.moveToNext());
}
cursor1.close();
colorCorrecton();
}
private void bucketMarkItem(long itemTitle) {
// TODO Auto-generated method stub
View listItemBla=(View)list.getChildAt((int)(long)itemTitle);
TextView txtDep=(TextView)listItemBla.findViewById(R.id.tv);
txtDep.setBackgroundColor(Color.GREEN);
String txtDepText = ""+txtDep.getText();
String[] result = txtDepText.split(" ");
String result1 = result[1];
Cursor cursor = myDB.getAllRows();
if(cursor.moveToFirst()){
do{
if(result1.equals(cursor.getString(1))){
long yourDBID = yourDB.insertRow(cursor.getInt(0));
}
}while(cursor.moveToNext());
}
cursor.close();
}
public void deleteItem(View v) {
// TODO Auto-generated method stub
myDB.deleteAll();
yourDB.deleteAll();
populateListView();
}
private void bucketDeletelistItem(long itemTitle) {
View listItemBla=(View)list.getChildAt((int)(long)itemTitle);
TextView txtDep=(TextView)listItemBla.findViewById(R.id.tv);
String txtDepText = ""+txtDep.getText();
String[] result = txtDepText.split(" ");
String result1 = result[1];
Cursor cursor = myDB.getAllRows();
int markID=0;
if(cursor.moveToFirst()){
do{
if(result1.equals(cursor.getString(1))){
boolean newid1 = myDB.deleteRow(cursor.getInt(0));
markID = cursor.getInt(0);
}
}while(cursor.moveToNext());
}
cursor.close();
populateListView();
//Toast.makeText(MainActivity.this, ""+list.getCount(), Toast.LENGTH_LONG).show();
Cursor cursor1 = yourDB.getAllRows();
if(cursor1.moveToFirst()){
do{
if(markID == cursor1.getInt(1)){
boolean newid2 = yourDB.deleteRow(cursor1.getInt(0));
}
}while(cursor1.moveToNext());
}
cursor1.close();
colorCorrecton();
}
public void enterItem(View v) {
// TODO Auto-generated method stub
EditText dataEntry_EditText=(EditText)findViewById(R.id.editText1);
Editable dataEntry_Editable = dataEntry_EditText.getText();
String dataEntry_Finaldata = dataEntry_Editable.toString();
long newId = myDB.insertRow(dataEntry_Finaldata, 233, "red");
//Toast.makeText(MainActivity.this, dataEntry_Finaldata, Toast.LENGTH_LONG).show();
dataEntry_EditText.setText("");
populateListView();
//Toast.makeText(MainActivity.this, ""+list.getCount(), Toast.LENGTH_LONG).show();
colorCorrecton();
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
closeDB();
}
private void closeDB() {
// TODO Auto-generated method stub
myDB.close();
}
private void openDB() {
// TODO Auto-generated method stub
myDB = new DBAdapter(this);
yourDB = new DBAdapter1(this);
myDB.open();
yourDB.open();
}
private void populateListView() {
// TODO Auto-generated method stub
Cursor cursor = myDB.getAllRows();
ArrayList myItems = new ArrayList();
//String[] myItems = {};
if(cursor.moveToFirst()){
int countData=0;
do{
countData=countData+1;
int id = cursor.getInt(0);
String name = "#"+countData +"- "+ cursor.getString(1);
myItems.add(name);
}while(cursor.moveToNext());
}
cursor.close();
ArrayAdapter adapter = new ArrayAdapter(this,R.layout.da_item,myItems);
list.setAdapter(adapter);
//Toast.makeText(MainActivity.this, Integer.toString(list.getFirstVisiblePosition())+","+Integer.toString(list.getLastVisiblePosition()), Toast.LENGTH_LONG).show();
//View v = list.getChildAt(0);
//v.setBackgroundColor(005566);
//View listItemBla=(View)list.getChildAt(list.getFirstVisiblePosition());
//Toast.makeText(MainActivity.this, ""+ list.getChildCount(), Toast.LENGTH_LONG).show();
//TextView txtDep=(TextView)listItemBla.findViewById(R.id.tv);
//txtDep.setBackgroundColor(Color.parseColor("00FF00"));
}
}
Logcat
06-21 09:46:13.656: D/libEGL(24175): loaded /system/lib/egl/libEGL_adreno200.so
06-21 09:46:13.656: D/libEGL(24175): loaded /system/lib/egl/libGLESv1_CM_adreno200.so
06-21 09:46:13.656: D/libEGL(24175): loaded /system/lib/egl/libGLESv2_adreno200.so
06-21 09:46:13.666: I/Adreno200-EGL(24175): : EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_JB_2.5.04.02.02.040.400_msm8960_JB_2.5_CL3744273_release_AU (CL3744273)
06-21 09:46:13.666: I/Adreno200-EGL(24175): Build Date: 06/30/13 Sun
06-21 09:46:13.666: I/Adreno200-EGL(24175): Local Branch:
06-21 09:46:13.666: I/Adreno200-EGL(24175): Remote Branch: quic/jb_2.5
06-21 09:46:13.666: I/Adreno200-EGL(24175): Local Patches: NONE
06-21 09:46:13.666: I/Adreno200-EGL(24175): Reconstruct Branch: AU_LINUX_ANDROID_JB_2.5.04.02.02.040.400 + NOTHING
06-21 09:46:13.706: D/OpenGLRenderer(24175): Enabling debug mode 0
06-21 09:46:24.217: D/AndroidRuntime(24175): Shutting down VM
06-21 09:46:24.217: W/dalvikvm(24175): threadid=1: thread exiting with uncaught exception (group=0x40c12ae0)
06-21 09:46:24.217: E/AndroidRuntime(24175): FATAL EXCEPTION: main
06-21 09:46:24.217: E/AndroidRuntime(24175): java.lang.IllegalStateException: Could not execute method of the activity
06-21 09:46:24.217: E/AndroidRuntime(24175): at android.view.View$1.onClick(View.java:3673)
06-21 09:46:24.217: E/AndroidRuntime(24175): at android.view.View.performClick(View.java:4278)
06-21 09:46:24.217: E/AndroidRuntime(24175): at android.view.View$PerformClick.run(View.java:17429)
06-21 09:46:24.217: E/AndroidRuntime(24175): at android.os.Handler.handleCallback(Handler.java:725)
06-21 09:46:24.217: E/AndroidRuntime(24175): at android.os.Handler.dispatchMessage(Handler.java:92)
06-21 09:46:24.217: E/AndroidRuntime(24175): at android.os.Looper.loop(Looper.java:137)
06-21 09:46:24.217: E/AndroidRuntime(24175): at android.app.ActivityThread.main(ActivityThread.java:5099)
06-21 09:46:24.217: E/AndroidRuntime(24175): at java.lang.reflect.Method.invokeNative(Native Method)
06-21 09:46:24.217: E/AndroidRuntime(24175): at java.lang.reflect.Method.invoke(Method.java:511)
06-21 09:46:24.217: E/AndroidRuntime(24175): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:803)
06-21 09:46:24.217: E/AndroidRuntime(24175): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:570)
06-21 09:46:24.217: E/AndroidRuntime(24175): at dalvik.system.NativeStart.main(Native Method)
06-21 09:46:24.217: E/AndroidRuntime(24175): Caused by: java.lang.reflect.InvocationTargetException
06-21 09:46:24.217: E/AndroidRuntime(24175): at java.lang.reflect.Method.invokeNative(Native Method)
06-21 09:46:24.217: E/AndroidRuntime(24175): at java.lang.reflect.Method.invoke(Method.java:511)
06-21 09:46:24.217: E/AndroidRuntime(24175): at android.view.View$1.onClick(View.java:3668)
06-21 09:46:24.217: E/AndroidRuntime(24175): ... 11 more
06-21 09:46:24.217: E/AndroidRuntime(24175): Caused by: java.lang.NullPointerException
06-21 09:46:24.217: E/AndroidRuntime(24175): at com.example.bucketlist.MainActivity.colorCorrecton(MainActivity.java:47)
06-21 09:46:24.217: E/AndroidRuntime(24175): at com.example.bucketlist.MainActivity.enterItem(MainActivity.java:204)
06-21 09:46:24.217: E/AndroidRuntime(24175): ... 14 more
06-21 09:46:26.069: I/Process(24175): Sending signal. PID: 24175 SIG: 9
Answer
The problem is, using
TextView txtDep1=(TextView)listItemBla1.findViewById(R.id.tv);
is telling the system to look inside of listItemBla1 for a View with an id of tv which it obviously won't find because no View can exist inside your ListView (at least not how you expect it to).
What you need to do is create a custom adapter and override getView() where you can inflate the layout with the TextView you want.
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