I have a main view(listview) and a second main view(edittext). I pass data from second main view backwards to first main view using startActivityforResult(). I have tested it out and I recieve the string back with no problem. However there are some problems displaying it on listview. My listview has two xml files one for the listview layout and one for the textview row. I have no idea why I am getting a nullpointer exception.
03-14 22:50:33.429 9268-9268/com.example.anusha.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.anusha.app, PID: 9268
java.lang.NullPointerException
at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:392)
at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
at android.widget.AbsListView.obtainView(AbsListView.java:2780)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1274)
at android.widget.ListView.onMeasure(ListView.java:1186)
at android.view.View.measure(View.java:17594)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:17594)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:17594)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:453)
at android.view.View.measure(View.java:17594)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:17594)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:17594)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2588)
at android.view.View.measure(View.java:17594)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2308)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2030)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1267)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6640)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:813)
at android.view.Choreographer.doCallbacks(Choreographer.java:613)
at android.view.Choreographer.doFrame(Choreographer.java:583)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:799)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5635)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
Here is my first main view with my listview. I'm pretty sure the problem is with the arrayadapter. Don't know what it is though.
ArrayList<String> array= new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_address_list);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, R.layout.activity_address_list,R.id.rowTextView, array);
ListView listview = (ListView) findViewById(R.id.listView);
listview.setAdapter(adapter);
}
private void Add() {
Intent intent = new Intent(AddressList.this, SilentGeofence.class);
startActivityForResult(intent, 2);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 2) {
if (resultCode == RESULT_OK){
String result = data.getStringExtra("result");
array.add(result);
}
}
}
Here is my second main
Button add = (Button) findViewById(R.id.button);
add.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
String ag = txt1.getText().toString().trim();
txt1.setText("");
Intent returnIntent = new Intent();
returnIntent.putExtra("result",ag);
setResult(RESULT_OK,returnIntent);
finish();
public ArrayAdapter (Context context, int resource, int textViewResourceId, T[] objects)
Added in API level 1
Constructor
Parameters
context The current context.
resource The resource ID for a layout file containing a layout to use when instantiating views.
textViewResourceId The id of the TextView within the layout resource to be populated
objects The objects to represent in the ListView.
So you should use layout of the textview not the listview layout see here
see here
new ArrayAdapter<>(this, R.layout.layout_name_of_the_xml_containing_textview,R.id.rowTextView, array);
You must initialise your list in onCreate(), Just after the getSupportActionBar().setDisplayHomeAsUpEnabled(true);
And your ArrayAdapter<String> adapter should be a field not a local variable because, after you do array.add(result) you must also call adapter.notifyDataSetChanged() in order to refresh and populate the results in the listview
Related
I'm creating my own application. I tested it on Android Lollipop and Marshmallow - everything works great. But whenever I try Android Kitkat, an error occurs. Here's error log:
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.newproject/com.example.newproject.Progi}: java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.math.BigDecimal[][]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.math.BigDecimal[][]
at com.example.newproject.Progi.onCreate(Progi.java:62)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
It looks like problem is on line 62 in "progi" class, but - as for me - everything is OK especially that on newer Android versions it works great.
public class Progi extends AppCompatActivity {
Intent intent;
Bundle liczby;
Bundle doble;
BigDecimal tablica [][];
BigDecimal punkty = new BigDecimal(-1);
#Override
public boolean onPrepareOptionsMenu(Menu menu)
{
android.content.SharedPreferences shared = android.preference.PreferenceManager.getDefaultSharedPreferences(this);
boolean warunek = shared.getBoolean("serial", false);
android.view.MenuItem menuitem = menu.getItem(0);
if(warunek)
{
menuitem.setTitle("Oceny pojedynczo");
}
else menuitem.setTitle("Oceny seryjnie");
return true;
}
public boolean onCreateOptionsMenu(Menu menu) {
android.view.MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.firstmenu, menu);
return true;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layoutprogi);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
getSupportActionBar().setTitle("Progi punktowe");
intent = getIntent();
liczby = intent.getBundleExtra("liczby");
doble = intent.getBundleExtra("doble");
tablica = (BigDecimal[][]) doble.getSerializable("doble"); //here is line 62
if(intent.hasExtra("max")) {
Bundle a = intent.getBundleExtra("max");
punkty = (BigDecimal) a.getSerializable("max");
}
przejscie(true);
if(punkty.compareTo(new BigDecimal(-3))==0)
{
procenty(findViewById(android.R.id.content));
}
else if(punkty.compareTo(new BigDecimal(-1))!=0)
{
liczymy(findViewById(android.R.id.content));
}}
And in case someone asking "what 'tablica' gets from intent?":
BigDecimal[][] tablica = new BigDecimal[16][3];
//here i get data from file and put in inside "tablica"
Bundle doble = new Bundle();
doble.putSerializable("doble", tablica);
Intent intent = new Intent(Starter.this, MyActivity.class);
intent.putExtra("doble", doble);
startActivity(intent);
Any idea what's wrong?
Try switching your array implementation (BigDecimal[] []) to ArrayList.
If you want to pass an Array through an intent on Android versions
prior to Android 5.0.1 (maybe some older versions work aswell, but up
to Android 4.3 it is NOT working) You'll have to work around it. You
could do this by converting your Array to an ArrayList.
Then you would be casting it something like this:
(ArrayList<ArrayList<BigDecimal>>) doble.getSerializable("doble");
Related SO answer
i tried to use a library (https://android-arsenal.com/details/1/1414) for a sticky header in a list view. I this configured well the library because i can use classes from there.
The code i'm using is like in the example from the link above, but i get a nullPointerExeption at ".build();"
This is the code :
public class MainActivity extends Activity {
ViewGroup containerLayout ;
ListView listView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
containerLayout = (ViewGroup) findViewById(R.id.containerLayout);
listView = (ListView) findViewById(R.id.list);
String[] values = new String[]{"Android List View",
"Adapter implementation",
"Simple List View In Android",
"Create List View Android",
"Android Example",
"List View Source Code",
"List View Array Adapter",
"Android Example List View",
};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, values);
// Assign adapter to ListView
listView.setAdapter(adapter);
StikkyHeaderBuilder.stickTo(listView)
.setHeader(R.id.header,containerLayout )
.minHeightHeader(250)
.animator(new IconAnimator())
.build();
} }
And this is my error log:
08-14 15:10:57.188 32562-32562/com.example.cretucalinn.stickyheader1
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.cretucalinn.stickyheader1, PID: 32562
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.cretucalinn.stickyheader1/com.example.cretucalinn.stickyheader1.MainActivity}:
java.lang.NullPointerException
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2412)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2470)
at android.app.ActivityThread.access$900(ActivityThread.java:174)
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1307)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5593)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at
it.carlom.stikkyheader.core.StikkyHeader.disallowTouchBehindHeader(StikkyHeader.java:47)
at
it.carlom.stikkyheader.core.StikkyHeader.build(StikkyHeader.java:38)
at
it.carlom.stikkyheader.core.StikkyHeaderBuilder$ListViewBuilder.build(StikkyHeaderBuilder.java:113)
at
it.carlom.stikkyheader.core.StikkyHeaderBuilder$ListViewBuilder.build(StikkyHeaderBuilder.java:95)
at
com.example.cretucalinn.stickyheader1.MainActivity.onCreate(MainActivity.java:61)
at android.app.Activity.performCreate(Activity.java:5458)
at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2376)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2470)
at android.app.ActivityThread.access$900(ActivityThread.java:174)
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1307)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5593)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
I am learning android development and i have a problem displaying contact detail in my app.
When I click an item of contact activity, the app hangs.
Could you help me please?
This is the activity App of Contact List.
public class ListViewActivity3 extends AppCompatActivity {
ListView listView;
List<ContactHelper> listAdapter;
public static final String Key_Postion = "keyPosition" ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view3);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
listAdapter = new ArrayList<ContactHelper>();
listAdapter.clear();
listAdapter.add(new ContactHelper("achref", "Tunisien", "2222222", R.drawable.imagesand));
listAdapter.add(new ContactHelper("achref", "Tunisien", "2222222", R.drawable.imagesand));
listAdapter.add(new ContactHelper("achref", "Tunisien", "2222222", R.drawable.imagesand));
listAdapter.add(new ContactHelper("achref", "Tunisien", "2222222", R.drawable.imagesand));
listAdapter.add(new ContactHelper("achref", "Tunisien", "2222222", R.drawable.imagesand));
listView = (ListView) findViewById(R.id.listviewCustomAdapter);
listView.setAdapter(new AdapterCustom(ListViewActivity3.this, R.layout.listviewitem1, listAdapter));
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent i3 = new Intent(ListViewActivity3.this, ContactDetailItem.class);
i3.putExtra(Key_Postion, position);
startActivity(i3);
}
});
}
}
and this the ConatctDetailItem
public class ContactDetailItem extends AppCompatActivity {
TextView n, ph, surn;
ImageView imgC;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_detail_item);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
n = (TextView) findViewById(R.id.contactName);
surn = (TextView) findViewById(R.id.contactSurname);
ph = (TextView) findViewById(R.id.contactPhone);
imgC = (ImageView) findViewById(R.id.imgContact);
Bundle bundle = getIntent().getExtras();
if (bundle != null) {
ContactHelper contactHelper = new ContactHelper();
ListViewActivity3 lv = new ListViewActivity3();
int position = bundle.getInt(ListViewActivity3.Key_Postion);
n.setText(lv.listAdapter.get(position).getName());
surn.setText(lv.listAdapter.get(position).getSurname());
ph.setText(lv.listAdapter.get(position).getPhone());
imgC.setImageResource(lv.listAdapter.get(position).getPhoto());
}
}
}
Here is the logcat.
com.example.achre.activityapp E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.achre.activityapp/com.example.achre.activityapp.ContactDetailItem}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.achre.activityapp.ContactDetailItem.onCreate(ContactDetailItem.java:50)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
In ContactDetailItem you are creating new ListViewActivity3. Instead it put to extra ContactHelper object.
Change your code like this:
Intent i3 = new Intent(ListViewActivity3.this, ContactDetailItem.class);
i3.putExtra(Key_Postion, listAdapter.get(position));
startActivity(i3);
and in ContactDetailItem:
ContactHelper contactHelper = (ContactHelper) bundle.getSerializableExtra(ListViewActivity3.Key_Postion);
n.setText(contactHelper.getName());
// ...
also your ContactHelper class must implement Serializable interface
I want to know why my application is throwing a runtime exception when I run it? I used to the code in the following link for my application,
dynamically add and remove view to viewpager.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar ab=getActionBar();
pagerAdapter = new MainPagerAdapter();
pager = (ViewPager) findViewById (R.id.pager);
pager.setAdapter (pagerAdapter);
inflater = (LayoutInflater)getSystemService
(Context.LAYOUT_INFLATER_SERVICE);
v0 = (FrameLayout) inflater.inflate (R.layout.listlayout, null);
Button button=(Button)findViewById(R.id.button1);
button.setOnClickListener(this);
pagerAdapter.addView (v0, 0);
pagerAdapter.notifyDataSetChanged();
}
#Override
public void onClick(View v) {
if(v.getId()==R.id.button1)
{
pagerAdapter.addView (v0);
pagerAdapter.notifyDataSetChanged();
}
}
LogCat:
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.todolistworkable/com.example.todolistworkable.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
at android.app.ActivityThread.access$600(ActivityThread.java:128)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4514)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
at dalvik.system.NativeStart.main(Native Method)Caused by: java.lang.NullPointerException
at com.example.todolistworkable.MainActivity.onCreate(MainActivity.java:43)
at android.app.Activity.performCreate(Activity.java:4465)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1053)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
the object on line 43 of your code within your onCreate method is null. Most likely the target of one of your findViewById calls is not returning what you expect it to.
See this for more info.
How to interpret Logcat
When I execute the following code I get an IllegalStateException..
public class DatabaseView extends Activity{
TextView tv;
MySQLiteHelper h;
TableLayout main;
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.newview);
h=new MySQLiteHelper(this);
main=(TableLayout) findViewById(R.id.tb1);
table();
}
private void table() {
// TODO Auto-generated method stub
TableRow header_row=new TableRow(this);
header_row.setLayoutParams(new LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
TextView item=new TextView(this);
item.setText("Item");
header_row.addView(item);
TextView amt=new TextView(this);
amt.setText("Amount");
header_row.addView(amt);
main.addView(header_row, new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
Cursor c=h.getAllEntry();
c.moveToFirst();
do
{
TableRow tr=new TableRow(this);
tr.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
TextView tv=new TextView(this);
Log.d(" ", c.getString(2));
tv.setText(c.getString(2));
tr.addView(item);
TextView amnt=new TextView(this);
Log.d(" ", c.getString(1));
amnt.setText(c.getString(1));
tr.addView(amt);
tr.addView(tv);
tr.addView(amnt);
main.addView(tr,new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
c.moveToNext();
}while(!c.isAfterLast());
}
The error log is--
AndroidRuntime(1692):FATAL EXCEPTION: main
AndroidRuntime(1692): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.expensesdatabase/com.example.expensesdatabase.DatabaseView}: >java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
AndroidRuntime(1692):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
AndroidRuntime(1692):at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
AndroidRuntime(1692):at android.app.ActivityThread.access$600(ActivityThread.java:141)
AndroidRuntime(1692):at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
AndroidRuntime(1692):at android.os.Handler.dispatchMessage(Handler.java:99)
AndroidRuntime(1692):at android.os.Looper.loop(Looper.java:137)
AndroidRuntime(1692):at android.app.ActivityThread.main(ActivityThread.java:5103)
AndroidRuntime(1692):at java.lang.reflect.Method.invokeNative(Native Method)
AndroidRuntime(1692):at java.lang.reflect.Method.invoke(Method.java:525)
Please tell why this error is occurring and solution to the same.Thanks in advance.
In the do-while loop, you're re-adding item and amt views that you've already added to a parent.
Errors like this are easy to diagnose when you look at the logcat, below the part you've posted. There's a "caused by" exception below it that points you to the exact line of code.