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Thread: Facing a problem in android studio ( java )

  1. #1
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    Default Facing a problem in android studio ( java )

    Hi ! I am writing an android launcher, just following the guide in youtube. First 4 lessons were cool, but after that with some new lines of code + new folders etc. launcher just stopped working. I am not really sure what exactly I have to put here to show you and sorry for that.. Any help will be appreciated.

  2. #2
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    Default Facing a problem in android studio ( java )

    Hi ! I am writing an android launcher, just following the guide in youtube. First 4 lessons were cool, but after that with some new lines of code + new folders etc. launcher just stopped working. I am not really sure what exactly I have to put here to show you and sorry for that.. Any help will be appreciated.

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Facing a problem in android studio ( java )

    Moved to Android Section.

    Where is the problem?
    Is it in the IDE trying to compile the program? Copy the error messages here.
    Or when there is a clean compile and you try executing the app in a device?
    If when executing, are there any error messages in the logcat console?
    If you don't understand my answer, don't ignore it, ask a question.

  4. #4
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    Default Re: Facing a problem in android studio ( java )

    the problem is that launcher stops working. No it happens while testing on physical device only ( emulator is rly slow ).

    package com.simcoder.novalauncherclone;
     
    import android.content.Context;
    import android.support.annotation.NonNull;
    import android.support.v4.view.PagerAdapter;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.GridView;
     
     
    import java.util.ArrayList;
     
    public class ViewPagerAdapter extends PagerAdapter {
     
        Context context;
        ArrayList<PagerObject> pagerAppList;
        int cellHeight, numColumn;
        ArrayList<com.simcoder.novalauncherclone.AppAdapter> appAdapterList = new ArrayList<>();
     
        public ViewPagerAdapter(Context context, ArrayList<PagerObject> pagerAppList, int cellHeight, int numColumn){
            this.context = context;
            this.pagerAppList = pagerAppList;
            this.cellHeight = cellHeight;
            this.numColumn = numColumn;
        }
     
        @NonNull
        @Override
        public Object instantiateItem(@NonNull ViewGroup container, int position) {
            LayoutInflater inflater = LayoutInflater.from(context);
            ViewGroup layout = (ViewGroup) inflater.inflate(R.layout.pager_layout, container, false);
     
            final GridView mGridView = layout.findViewById(R.id.grid);
            mGridView.setNumColumns(numColumn);
     
            com.simcoder.novalauncherclone.AppAdapter mGridAdapter = new com.simcoder.novalauncherclone.AppAdapter(context, pagerAppList.get(position).getAppList(), cellHeight);
            mGridView.setAdapter(mGridAdapter);
     
            appAdapterList.add(mGridAdapter);
     
            container.addView(layout);
            return layout;
        }
     
        @Override
        public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
            container.removeView((View) object);
        }
     
        @Override
        public int getCount() {
            return pagerAppList.size();
        }
     
        @Override
        public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
            return view == object;
        }
     
        public void notifyGridChanged(){
            for(int i = 0; i < appAdapterList.size();i++){
                appAdapterList.get(i).notifyDataSetChanged();
            }
        }
    }
    Last edited by Norm; December 29th, 2018 at 02:26 PM. Reason: Changed Quotes tag to code tags

  5. #5
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    Default Re: Facing a problem in android studio ( java )

    launcher stops working
    What is shown in the logcat?

    First 4 lessons were cool, but after that with some new lines of code + new folders etc. launcher just stopped working.
    What has been changed from when the app was working?


    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  6. #6
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    Default Re: Facing a problem in android studio ( java )

    I dont remember correctly sorry, I am not on my pc now..

    AppAdapter and AppObject java classes were created.

    com.simcoder.novalauncherclone.ViewPagerAdapter mViewPagerAdapter;
        private void initializeHome() {
            ArrayList<PagerObject> pagerAppList = new ArrayList<>();
     
            ArrayList<AppObject> appList1 = new ArrayList<>();
            ArrayList<AppObject> appList2 = new ArrayList<>();
            ArrayList<AppObject> appList3 = new ArrayList<>();
            for (int i = 0; i < numColumn*numRow ;i++)
                appList1.add(new AppObject("", "", getResources().getDrawable(R.drawable.ic_launcher_foreground), false));
            for (int i = 0; i < numColumn*numRow ;i++)
                appList2.add(new AppObject("", "", getResources().getDrawable(R.drawable.ic_launcher_foreground), false));
            for (int i = 0; i < numColumn*numRow ;i++)
                appList3.add(new AppObject("", "", getResources().getDrawable(R.drawable.ic_launcher_foreground), 
     
     
      @Override
        public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
            container.removeView((View) object);

    last 2 lines were added for destroying that crash, but launcher stopped anyway..

    --- Update ---

    If it's possible, how can I contact you ? Tomorrow I will write the code again and link all the errors and other code.

  7. #7
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    Default Re: Facing a problem in android studio ( java )

    Can you look at the logcat to see if there are errors?

    To copy the logcat to a file on your PC
    Connect the device to the PC
    On Windows, Run this command:
    <Path to adv.exe file>adb.exe logcat >> LogcatFile.txt
    If you don't understand my answer, don't ignore it, ask a question.

  8. #8
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    Default Re: Facing a problem in android studio ( java )

    cant do that sooner than in 10hrs sorry

  9. #9
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    Default Re: Facing a problem in android studio ( java )

    No problem. I'm here every day.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Facing a problem in android studio ( java )

    Hi there I've been thinking about my problem for a long long time. I found some mistakes by myself and now the launcher is working fine, but I am not sure 100% that it will never crash cause code still has some issues. Would you take a look at java classes ?

    Damn, in android emulator its crashing..Tested on physical device and it was working really good with no erros or crashes Should I just leave these emulators and keep going with my physical device?
    Last edited by fallen01; December 29th, 2018 at 04:24 AM.

  11. #11
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    Default Re: Facing a problem in android studio ( java )

    in android emulator its crashing
    Are there error messages in the logcat?

    I don't know why it would work in the device and not the emulator. Are they running different versions of Android?
    If you don't understand my answer, don't ignore it, ask a question.

  12. #12
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    Default Re: Facing a problem in android studio ( java )

    Can not really remember now, I will check it in 30 mins Yes they're running different versions of android ( 7.0 on physical device ) and 5.0 on emulator.

    Here is erros while running emulator without anything.

    Emulator: Warning: Quick Boot / Snapshots not supported on this machine. A CPU with EPT + UG features is currently needed. We will address this in a future release.

    18:40 Emulator: dsound: Could not initialize ADC

    18:40 Emulator: dsound: Could not create capture buffer

    18:40 Emulator: dsound: Reason: An undetermined error occurred inside the DirectSound subsystem

    18:40 Emulator: dsound: Could not initialize ADC

    18:40 Emulator: dsound: Could not create capture buffer

    18:40 Emulator: dsound: Reason: An undetermined error occurred inside the DirectSound subsystem

    18:40 Emulator: audio: Failed to create voice `goldfish_audio_in'

    18:40 Emulator: C:\Users\User\AppData\Local\Android\Sdk\emulator\q emu\windows-x86_64\qemu-system-armel.exe: warning: opening audio input failed
    Last edited by fallen01; December 29th, 2018 at 08:43 AM.

  13. #13
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    Default Re: Facing a problem in android studio ( java )

    Have a new errors now on physical device. It is because I wrote something wrong ( basically launcher is closing when I tap on any app or try to drag it ) errors log is here :

    2018-12-29 20:39:52.764 6129-6129/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.user.emnilauncher, PID: 6129
    java.lang.ClassCastException: android.app.Application cannot be cast to com.example.user.emnilauncher.MainActivity
    at com.example.user.emnilauncher.AppAdapter$2.onLongC lick(AppAdapter.java:67)
    at android.view.View.performLongClickInternal(View.ja va:5752)
    at android.view.View.performLongClick(View.java:5710)
    at android.view.View.performLongClick(View.java:5728)
    at android.view.View$CheckForLongPress.run(View.java: 22610)
    at android.os.Handler.handleCallback(Handler.java:836 )
    at android.os.Handler.dispatchMessage(Handler.java:10 3)
    at android.os.Looper.loop(Looper.java:203)
    at android.app.ActivityThread.main(ActivityThread.jav a:6251)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCa ller.run(ZygoteInit.java:1063)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit .java:924)

  14. #14
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    Default Re: Facing a problem in android studio ( java )

    java.lang.ClassCastException: android.app.Application cannot be cast to com.example.user.emnilauncher.MainActivity
    at com.example.user.emnilauncher.AppAdapter$2.onLongC lick(AppAdapter.java:67)
    Looks like the code at line 67 is doing an invalid cast.

    Is that in some of the new code you added?
    If you don't understand my answer, don't ignore it, ask a question.

  15. #15
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    Default Re: Facing a problem in android studio ( java )

    Yes sir. Here it is :

    package com.example.user.emnilauncher;
     
    import android.content.Context;
    import android.content.Intent;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.ImageView;
    import android.widget.LinearLayout;
    import android.widget.TextView;
     
    import java.util.List;
     
    public class AppAdapter extends BaseAdapter {
        Context context;
        List<AppObject> appList;
        int cellHeight;
     
        public AppAdapter(Context context, List<AppObject> appList, int cellHeight) {
            this.context = context;
            this.appList = appList;
            this.cellHeight = cellHeight;
        }
     
        @Override
        public int getCount() {
            return appList.size();
        }
     
     
        @Override
        public Object getItem(int position) {
            return appList.get(position);
        }
     
        @Override
        public long getItemId(int position) {
            return position;
        }
     
        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            View v;
            if (convertView == null) {
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                v = inflater.inflate(R.layout.item_app, parent, false);
            } else {
                v = convertView;
            }
     
            LinearLayout mLayout = v.findViewById(R.id.layout);
            ImageView mImage = v.findViewById(R.id.image);
            TextView mLabel = v.findViewById(R.id.label);
            LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, cellHeight);
            mLayout.setLayoutParams(lp);
     
            mImage.setImageDrawable(appList.get(position).getImage());
            mLabel.setText(appList.get(position).getName());
     
            mLayout.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    ((MainActivity) context).itemPress(appList.get(position));
                }
            });
            mLayout.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    ((MainActivity) context).itemLongPress(appList.get(position));
                    return false;
                }
            });
            return v;
        }
    }

    But there is nothing wrong with it as I see..
    Last edited by Norm; December 29th, 2018 at 02:48 PM. Reason: Changed quote to code tags

  16. #16
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    Default Re: Facing a problem in android studio ( java )

    Please edit your post and wrap your code with code tags: (Not Quote tags)

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.

    Which line is line 67?

    Why is context being cast to MainActivity?
    If you don't understand my answer, don't ignore it, ask a question.

  17. #17
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    Default Re: Facing a problem in android studio ( java )

            mLayout.setOnLongClickListener(new View.OnLongClickListener() {


    this is line 67

    --- Update ---

    here is MainActivity :

    package com.example.user.emnilauncher;
     
    import android.content.Intent;
    import android.content.pm.ResolveInfo;
    import android.graphics.Point;
    import android.graphics.drawable.Drawable;
    import android.support.annotation.NonNull;
    import android.support.design.widget.BottomSheetBehavior;
    import android.support.v4.view.ViewPager;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.view.WindowManager;
    import android.widget.GridView;
     
    import java.lang.reflect.Array;
    import java.util.ArrayList;
    import java.util.List;
     
    public class MainActivity extends AppCompatActivity {
        boolean isBottom = true;
        ViewPager mViewPager;
        int cellHeight;
     
        int NUMBER_OF_ROWS = 5;
        int DRAWER_PEEK_HEIGHT = 100;
     
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            getSupportActionBar().hide();
     
     
            initializeHome();
            initializeDrawer();
        }
     
        ViewPagerAdapter mViewPagerAdapter;
        private void initializeHome() {
            ArrayList<PagerObject> pagerAppList = new ArrayList<>();
     
            ArrayList<AppObject> appList1 = new ArrayList<>();
            ArrayList<AppObject> appList2 = new ArrayList<>();
            ArrayList<AppObject> appList3 = new ArrayList<>();
     
            for (int i = 0; i < 20 ; i++)
                appList1.add(new AppObject("", "", getResources().getDrawable(R.drawable.ic_launcher_foreground)));
            for (int i = 0; i < 20 ; i++)
                appList2.add(new AppObject("", "", getResources().getDrawable(R.drawable.ic_launcher_foreground)));
            for (int i = 0; i < 20 ; i++)
                appList3.add(new AppObject("", "", getResources().getDrawable(R.drawable.ic_launcher_foreground)));
     
            pagerAppList.add(new PagerObject(appList1));
            pagerAppList.add(new PagerObject(appList2));
            pagerAppList.add(new PagerObject(appList3));
     
            cellHeight = (getDisplayContentHeight()- DRAWER_PEEK_HEIGHT) / NUMBER_OF_ROWS;
     
     
            mViewPager = findViewById(R.id.viewPager);
            mViewPagerAdapter = (new ViewPagerAdapter(this, pagerAppList, cellHeight));
            mViewPager.setAdapter(mViewPagerAdapter);
     
        }
     
     
     
        List<AppObject> installedAppList = new ArrayList<>();
         GridView mDrawerGridView;
         BottomSheetBehavior mBottomSheetBehavior;
        private void initializeDrawer() {
            View mBottomSheet = findViewById(R.id.bottomSheet);
            mDrawerGridView = findViewById(R.id.drawerGrid);
            mBottomSheetBehavior = BottomSheetBehavior.from(mBottomSheet);
            mBottomSheetBehavior.setHideable(false);
            mBottomSheetBehavior.setPeekHeight(DRAWER_PEEK_HEIGHT);
     
            installedAppList = getInstalledAppList();
     
            mDrawerGridView.setAdapter(new AppAdapter(getApplicationContext(), installedAppList, cellHeight));
     
            mBottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
                @Override
                public void onStateChanged(@NonNull View bottomSheet, int newState) {
     
                    if(mAppDrag != null)
                        return;
                    if(newState == BottomSheetBehavior.STATE_COLLAPSED&& mDrawerGridView.getChildAt(0).getY() != 0)
                    mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                    if(newState == BottomSheetBehavior.STATE_DRAGGING && mDrawerGridView.getChildAt(0).getY() != 0)
                        mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                }
     
                @Override
                public void onSlide(@NonNull View bottomSheet, float slideOffSet) {
     
                }
            });
     
        }
     
     
        AppObject mAppDrag = null;
        public void itemPress(AppObject app) {
            if (mAppDrag != null) {
     
                app.setPackageName(mAppDrag.getPackageName());
                app.setName(mAppDrag.getName());
                app.setImage(mAppDrag.getImage());
                mAppDrag = null;
                mViewPagerAdapter.notifyGridChanged();
                return;
            }else{
                Intent launchAppIntent = getApplicationContext().getPackageManager().getLaunchIntentForPackage(app.getPackageName());
                if (launchAppIntent != null)
                    getApplicationContext().startActivity(launchAppIntent);
            }
        }
     
     
        public void itemLongPress(AppObject app){
            collapseDrawer();
            mAppDrag = app;
        }
        private void collapseDrawer() {
            mDrawerGridView.setY(0);
            mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
        }
     
     
     
     
     
     
     
        private List<AppObject> getInstalledAppList() {
            List<AppObject> list = new ArrayList<>();
     
            Intent intent = new Intent(Intent.ACTION_MAIN, null);
            intent.addCategory(Intent.CATEGORY_LAUNCHER);
            List<ResolveInfo> untreatedAppList = getApplicationContext().getPackageManager().queryIntentActivities(intent, 0);
     
            for(ResolveInfo untreatedApp : untreatedAppList) {
                String appName = untreatedApp.activityInfo.loadLabel(getPackageManager()).toString();
                String appPackageName = untreatedApp.activityInfo.packageName;
                Drawable appImage = untreatedApp.activityInfo.loadIcon(getPackageManager());
                AppObject app = new AppObject(appPackageName, appName, appImage);
                if (!list.contains(app))
                    list.add(app);
            }
            return list;
        }
        private int getDisplayContentHeight() {
            final WindowManager windowManager = getWindowManager();
            final Point size = new Point();
            int screenHeight = 0, actionBarHeight= 0, statusBarHeight = 0;
            if (getActionBar()!= null){
                actionBarHeight = getActionBar().getHeight();
            }
            int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android")  ;
            if(resourceId > 0){
                statusBarHeight = getResources().getDimensionPixelSize(resourceId);
            }
            int contentTop = (findViewById(android.R.id.content).getTop());
            windowManager.getDefaultDisplay().getSize(size);
            screenHeight = size.y;
            return screenHeight - contentTop - actionBarHeight - statusBarHeight;
        }
    }

    Glad that I fixed it by myself again! Coding is awesome!
    Last edited by fallen01; December 29th, 2018 at 03:18 PM.

  18. #18
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    Default Re: Facing a problem in android studio ( java )

    this is line 67
    There isn't a cast on that line. The error message says: android.app.Application cannot be cast to com.example.user.emnilauncher.MainActivity.
    So I would expect to see the cast with (MainActivity) on line 67.

    Why does the code do a cast there?
    If you don't understand my answer, don't ignore it, ask a question.

  19. #19
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    Default Re: Facing a problem in android studio ( java )

    I literally can't understand logchat erros, usually I stuck on reading all red lines and just thinking but..I dont know how to explaion sorry

  20. #20
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    Default Re: Facing a problem in android studio ( java )

    can't understand logcat errors
    The lines with the error message looks like the lines that come from the printStackTrace method. That is standard java output.

    My question is about this line of code(which could be line 67):
    ((MainActivity) context).itemPress(appList.get(position));

    Why is context cast to MainActivity?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Facing a problem in android studio ( java )

        private void initializeDrawer() {
            View mBottomSheet = findViewById(R.id.bottomSheet);
            mDrawerGridView = findViewById(R.id.drawerGrid);
            mBottomSheetBehavior = BottomSheetBehavior.from(mBottomSheet);
            mBottomSheetBehavior.setHideable(false);
            mBottomSheetBehavior.setPeekHeight(DRAWER_PEEK_HEIGHT);
     
            installedAppList = getInstalledAppList();
     
            mDrawerGridView.setAdapter(new AppAdapter(getApplicationContext(), installedAppList, cellHeight));
     
            mBottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback()


    only one thing was wrong here,
       mDrawerGridView.setAdapter(new AppAdapter (context : this, installedAppList, cellHeight));
    instead of
       mDrawerGridView.setAdapter(new AppAdapter(getApplicationContext(), installedAppList, cellHeight));

  22. #22
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    Default Re: Facing a problem in android studio ( java )

    Have you fixed the problem now?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Facing a problem in android studio ( java )

    Yes sir, thanks for replying tho

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