從事Android音樂播放器專案，遇到了我的應用程式在啟動時崩潰的問題：-有解無憂

我正在嘗試使用 Sliding Up Panel 添加播放器，但應用程式在啟動時崩潰。如果你想看我的完整代碼； https://github.com/Kailash8460/poptune.git

主活動.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);
        }*/

    }

}

活動_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 這里沒有關于 SongsFragment、ArtistFragment 和 AlbumFragment 檔案的問題，因為我在添加向上滑動面板之前運行了這個應用程式并且成功運行但是在添加這個向上滑動面板應用程式后在啟動時崩潰。

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>

錯誤

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)

在 MainActivity.java:39 處出錯

MainActivity.java 的第 39 行：-

setContentView(R.layout.activity_main);

uj5u.com熱心網友回復：

在查看SlidingUpPanelLayout演示應用程式中的布局后，我看到它期望設定 android:gravity 屬性，而不是 android:layout_gravity。

試試這個來代替你的布局：

<?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>

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標籤：爪哇安卓 android-fragments 滑动抽屉 android-sliding

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