I am trying to add a player using Sliding Up Panel but the app crashes on startup. If you want to see my full code; https://github.com/Kailash8460/poptune.git MainActivity.java activity_main.xml MainFragment.java Here there is no issue on SongsFragment, ArtistFragment and AlbumFragment files, because I have run this application before adding the sliding up panel and that was successfully run but after adding

Working on Android Music Player Project, and ran into the issue where my app crashes on start up:

I am trying to add a player using Sliding Up Panel but the app crashes on startup. If you want to see my full code; https://github.com/Kailash8460/poptune.git

MainActivity.java

package com.example.poptunemusicplayerapplication;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;

import com.example.poptunemusicplayerapplication.fragments.MainFragment;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.sothree.slidinguppanel.SlidingUpPanelLayout;


public class MainActivity extends AppCompatActivity {

    private static final int KEY_PER = 123;
    private SlidingUpPanelLayout panelLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) !=
                PackageManager.PERMISSION_GRANTED){
            ActivityCompat.requestPermissions(MainActivity.this, new String[]
                    {Manifest.permission.READ_EXTERNAL_STORAGE}, KEY_PER);
            return;
        }
        else {
            UiInitialize();
        }

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

        switch (requestCode){
            case KEY_PER:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    UiInitialize();
                }
            default:
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }

    }

    private void UiInitialize() {

        ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(this));
        panelLayout = (SlidingUpPanelLayout) findViewById(R.id.sliding_layout);

        Fragment fragment = new MainFragment();
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.replace(R.id.main_container, fragment);
        transaction.commit();

        /*List<Song> songList = new SongLoader().getAllSongs(this);

        for (Song song : songList){
            Log.i("DATA","Title:" + song.title);
        }*/

    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/sliding_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="bottom"
    app:umanoPanelHeight="68dp"
    app:umanoShadowHeight="4dp"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/main_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <FrameLayout
        android:id="@+id/control_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</com.sothree.slidinguppanel.SlidingUpPanelLayout>

MainFragment.java Here there is no issue on SongsFragment, ArtistFragment and AlbumFragment files, because I have run this application before adding the sliding up panel and that was successfully run but after adding this Sliding Up Panel application crashes on startup.

package com.example.poptunemusicplayerapplication.fragments;

import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.viewpager.widget.ViewPager;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.poptunemusicplayerapplication.R;
import com.google.android.material.tabs.TabLayout;

import java.util.ArrayList;
import java.util.List;

public class MainFragment extends Fragment {

    private Toolbar toolbar;
    private TabLayout tabLayout;
    private ViewPager viewPager;

    public MainFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
        ((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
        tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
        viewPager = (ViewPager) rootView.findViewById(R.id.view_pager);

        setUpViewPager(viewPager);
        tabLayout.setupWithViewPager(viewPager);

        return rootView;
    }

    private void setUpViewPager(ViewPager viewPager) {
        FragmentAdapter adapter = new FragmentAdapter(getActivity().getSupportFragmentManager());
        adapter.AddFragments(new SongsFragment(), "Songs");
        adapter.AddFragments(new ArtistFragment(), "Artist");
        adapter.AddFragments(new AlbumFragment(), "Album");
        viewPager.setAdapter(adapter);
    }

    private class FragmentAdapter extends FragmentPagerAdapter {

        private List<Fragment> fragmentList = new ArrayList<>();
        private List<String> titleList = new ArrayList<>();

        public FragmentAdapter(@NonNull FragmentManager fm) {
            super(fm);
        }

        @NonNull
        @Override
        public Fragment getItem(int position) {
            return fragmentList.get(position);
        }

        @Override
        public int getCount() {
            return fragmentList.size();
        }

        public void AddFragments(Fragment fragment, String title) {
            fragmentList.add(fragment);
            titleList.add(title);
        }

        @Nullable
        @Override
        public CharSequence getPageTitle(int position) {
            return titleList.get(position);
        }
    }

}

fragment_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fragmentmainlist"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragments.MainFragment">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/appbar"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark">

        <androidx.appcompat.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:id="@+id/toolbar"
            app:layout_scrollFlags="scroll|enterAlways"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/Theme.AppCompat.Light"/>

        <com.google.android.material.tabs.TabLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/tabs"/>

    </com.google.android.material.appbar.AppBarLayout>

    <androidx.viewpager.widget.ViewPager
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/view_pager"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

</androidx.coordinatorlayout.widget.CoordinatorLayout>

Errors

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.poptunemusicplayerapplication, PID: 28426
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.poptunemusicplayerapplication/com.example.poptunemusicplayerapplication.MainActivity}: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2988)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:7025)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
     Caused by: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
     Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class com.sothree.slidinguppanel.SlidingUpPanelLayout
     Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Constructor.newInstance0(Native Method)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
        at android.view.LayoutInflater.createView(LayoutInflater.java:647)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706)
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195)
        at com.example.poptunemusicplayerapplication.MainActivity.onCreate(MainActivity.java:39)
        at android.app.Activity.performCreate(Activity.java:7258)
        at android.app.Activity.performCreate(Activity.java:7249)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1222)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2941)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:7025)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
     Caused by: java.lang.IllegalArgumentException: gravity must be set to either top or bottom
        at com.sothree.slidinguppanel.SlidingUpPanelLayout.setGravity(SlidingUpPanelLayout.java:366)
        at com.sothree.slidinguppanel.SlidingUpPanelLayout.<init>(SlidingUpPanelLayout.java:288)
        at com.sothree.slidinguppanel.SlidingUpPanelLayout.<init>(SlidingUpPanelLayout.java:270)
        at java.lang.reflect.Constructor.newInstance0(Native Method) 
        at java.lang.reflect.Constructor.newInstance(Constructor.java:334) 
        at android.view.LayoutInflater.createView(LayoutInflater.java:647) 
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790) 
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706) 
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195) 
        at com.example.poptunemusicplayerapplication.MainActivity.onCreate(MainActivity.java:39) 
        at android.app.Activity.performCreate(Activity.java:7258) 
        at android.app.Activity.performCreate(Activity.java:7249) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1222) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2941) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3073) 
        at android.app.ActivityThread.-wrap11(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:7025) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)

getting error at MainActivity.java:39

Line 39 of MainActivity.java:-

setContentView(R.layout.activity_main);

Answer

After looking at the layout in the demo app for SlidingUpPanelLayout, I see it is expecting the android:gravity attribute to be set, not android:layout_gravity.

Try this instead for your layout:

<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/sliding_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="bottom"
    app:umanoPanelHeight="68dp"
    app:umanoShadowHeight="4dp"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/main_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <FrameLayout
        android:id="@+id/control_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</com.sothree.slidinguppanel.SlidingUpPanelLayout>

Advertisement

Answer