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
Related
I try to open another activity by pressing a button in mainactivity but the program crashed when button is pressed and I don't know why.
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.shitapps.howtolosedignity/com.shitapps.howtolosedignity.ActivityQuiz}: java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase: /data/data/com.shitapps.howtolosedignity/databases/masterblaster
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase: /data/data/com.shitapps.howtolosedignity/databases/masterblaster
at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:55)
at android.database.sqlite.SQLiteDatabase.endTransaction(SQLiteDatabase.java:520)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:263)
at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188)
at com.shitapps.howtolosedignity.DbHelper.getAllQuestions(DbHelper.java:104)
at com.shitapps.howtolosedignity.ActivityQuiz.onCreate(ActivityQuiz.java:32)
at android.app.Activity.performCreate(Activity.java:5133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
here is my code:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
saakt = (Button)findViewById(R.id.button2);
saakt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
startActivity(intent);
}
;
});
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();
}
});
}
I use Android Studio.
edit:
public List<Question> getAllQuestions() {
List<Question> quesList = new ArrayList<Question>();
String selectQuery = "SELECT * FROM " + TABLE_QUEST;
dbase=this.getReadableDatabase();
Cursor cursor = dbase.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
Question quest = new Question();
quest.setId(cursor.getInt(0));
quest.setJautajums(cursor.getString(1));
quest.setAtbilde(cursor.getString(2));
quest.setOpcijaA(cursor.getString(3));
quest.setOpcijaB(cursor.getString(4));
quest.setOpcijaC(cursor.getString(5));
quesList.add(quest);
} while (cursor.moveToNext());
}
return quesList;
}
dbase is already closed and can't be used. Try with a local instance.
Change
dbase=this.getReadableDatabase();
Cursor cursor = dbase.rawQuery(selectQuery, null);
with
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
You shouldn't close your database after each query. You can just keep reference to it as a singleton. You can find more info by the references :
Android SQLite DB When to Close
Best place to close database connection
When trying to move to another activity the app crashes...
logcat
java.lang.RuntimeException: Unable to start activity ComponentInfo{myact.julianhernandez.com.counterapp/myact.julianhernandez.com.counterapp.CounterDisplay}: android.content.res.Resources$NotFoundException: String resource ID #0x0
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x0
at android.content.res.Resources.getText(Resources.java:244)
at android.widget.TextView.setText(TextView.java:3888)
at myact.julianhernandez.com.counterapp.CounterDisplay.onCreate(CounterDisplay.java:31)
at android.app.Activity.performCreate(Activity.java:5231)
MainActivity.class Code
public class MainActivity extends AppCompatActivity {
Button moveActivity;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
moveActivity = (Button) findViewById(R.id.list1_button);
moveActivity.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent toCounter = new Intent(MainActivity.this , CounterDisplay.class);
startActivity(toCounter);
}
});
CounterDisplay.class Code
public class CounterDisplay extends AppCompatActivity {
private TextView countView;
private Button addButton;
private Button subtractButton;
//int initialCount = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_counter_display);
countView = (TextView) findViewById(R.id.currentCount);
addButton = (Button) findViewById(R.id.add);
subtractButton = (Button) findViewById(R.id.subtract);
countView.setText(0);
//increment counter by 1
addButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int currentCount;// = initialCount;
for(currentCount=0;currentCount>=0;currentCount++){
countView.setText(currentCount);
}
}
});
}
}
Why does this code crash when switching activities?
Textview.setText(int) method takes a resource ID, not the text you are trying to display. Because there are no resource strings matching the ID you pass in (which is 0 on line 31), an exception gets thrown.
There are additional overloads of the setText() method that allow you to pass in a char[] if you don't want to use resource strings. View the documentation for more information. http://developer.android.com/reference/android/widget/TextView.html
I wanted to test my code on another device than my physical one, so I launched the app in GenyMotion emulator with a Samsung Galaxy S3 (API 18), but it keeps throwing a NoClassDefFoundError Exception in my class "SlidingMenuUtil" (a customized drawer menu) which is called on startup by my MainActivity.
Here is code from my onCreate in MainActivity:
#Bind(R.id.viewContentFullScreen) RelativeLayout viewContentFullScreen;
#Bind(R.id.viewContentTopBar) RelativeLayout viewContentTopBar;
#Bind(R.id.topBarWrapper) RelativeLayout topbarView;
private ViewContainer viewContainer;
private SlidingMenuUtil leftMenu;
private Bundle bundle;
private MessageHandler messageHandler;
private GoBackFunction currentGoBackFunction;
private CallbackManager callbackManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bundle = savedInstanceState;
setContentView(R.layout.activity_main);
leftMenu = new SlidingMenuUtil(this, SlidingMenuUtil.MenuType.LEFT, R.layout.drawer_menu, (int)(LayoutUtil.getScreenWidth(this) * 0.75), false);
populateMenu();
ButterKnife.bind(this);
messageHandler = new MessageHandler(this, findViewById(R.id.spinner));
FacebookSdk.sdkInitialize(getApplicationContext());
callbackManager = CallbackManager.Factory.create();
}
The problem occurs in the SlidingMenuUtil class on line: 67. Here is the constructor for the class:
public SlidingMenuUtil(Activity activity, MenuType menuType, int menuLayout, int shownMenuWidth, boolean fadeEffectOn) {
this.activity = activity;
this.menuType = menuType;
this.shownMenuWidth = shownMenuWidth;
this.fadeEffectOn = fadeEffectOn;
this.screenWidth = LayoutUtil.getScreenWidth(activity);
this.rootView = (ViewGroup)((ViewGroup)activity.findViewById(android.R.id.content)).getChildAt(0);
this.activityWrapper = new RelativeLayout(activity);
this.activityWrapper.setLayoutParams(this.rootView.getLayoutParams());
this.overlay = new RelativeLayout(activity);
this.overlay.setLayoutParams(new ViewGroup.LayoutParams(-1, -1));
this.overlay.setBackgroundColor(Color.parseColor("#000000"));
this.overlay.setAlpha(0.0F);
this.overlay.setVisibility(View.GONE);
this.overlay.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (menuOpen) {
toggle(new ToggleMenu() {
#Override
public void animationDone() {
}
});
}
}
});
this.rootView.addView(this.overlay);
this.menu = (LinearLayout)activity.getLayoutInflater().inflate(menuLayout, (ViewGroup) null, false);
this.menu.setLayoutParams(new ViewGroup.LayoutParams(shownMenuWidth, -1));
if (menuType == MenuType.LEFT) {
this.menu.setTranslationX((float)(-shownMenuWidth));
} else {
this.menu.setTranslationX((float)(screenWidth));
}
this.rootView.addView(this.menu);
this.menuOpen = false;
}
lin 67 is:
this.overlay.setOnClickListener(new View.OnClickListener() {
As mentioned before the problem only occurs in the emulator.
Here is the log:
812-812/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NoClassDefFoundError: nightout.dk.nightoutandroid.utils.SlidingMenuUtil$1
at nightout.dk.nightoutandroid.utils.SlidingMenuUtil.<init>(SlidingMenuUtil.java:67)
at nightout.dk.nightoutandroid.MainActivity.onCreate(MainActivity.java:40)
at android.app.Activity.performCreate(Activity.java:5133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
I hope somone can help me out.
Any help will be gratly appreciated
I’m using Sherlock library and I want to create a tab in my app but I’m getting a NullPointerException; what am I doing wrong?
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.bonsitesherlock/com.example.bonsitesherlock.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2077)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2104)
at android.app.ActivityThread.access$600(ActivityThread.java:134)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:4624)
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:809)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.widget.TabHost.addTab(TabHost.java:229)
at com.example.bonsitesherlock.MainActivity.addTab(MainActivity.java:49)
at com.example.bonsitesherlock.MainActivity.setTabs(MainActivity.java:32)
at com.example.bonsitesherlock.MainActivity.onCreate(MainActivity.java:27)
at android.app.Activity.performCreate(Activity.java:4479)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1050)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2041)
... 11 more
This is my MainActivity:
public class MainActivity extends SherlockActivity {
private TabHost mTabHost;
ProgressDialog pDialog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTabHost = (TabHost)findViewById(android.R.id.tabhost);
setTabs();
}
private void setTabs()
{
addTab("", R.drawable.tab_news, News.class);
addTab("", R.drawable.tab_servises, News.class);
addTab("", R.drawable.tab_profile, News.class);
}
private void addTab(String labelId, int drawableId, Class<?> c)
{
Intent intent = new Intent(getApplicationContext(), c);
TabHost.TabSpec spec = mTabHost.newTabSpec("tab" + labelId);
View tabIndicator = LayoutInflater.from(this).inflate(R.layout.tab_indicator, mTabHost.getTabWidget(), false);
TextView title = (TextView) tabIndicator.findViewById(R.id.title);
title.setText(labelId);
ImageView icon = (ImageView) tabIndicator.findViewById(R.id.icon);
icon.setImageResource(drawableId);
spec.setIndicator(tabIndicator);
spec.setContent(intent);
mTabHost.addTab(spec);
}
}
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