无法在所有活动中添加 SlidingUpPanel
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【中文标题】无法在所有活动中添加 SlidingUpPanel【英文标题】：Can't add SlidingUpPanel across all activities 【发布时间】：2018-04-19 11:03:44 【问题描述】：我正在尝试通过创建 baseActivity 在所有活动中从 umano (https://github.com/umano/androidSlidingUpPanel) 实施 SlidingUpPanel。但是在我创建了所有内容（baseactivity.java 和 baseactivity.xml）并将我的 MainActivity.java 扩展到 baseactivity 之后，它在 BaseActivity 中存在的每个视图上都给了我 nullpointerException。我似乎无法弄清楚为什么。 MainActivity 有自己独立的 .xml，我只想在不影响 MainActivity 现有布局的情况下添加 SlidingUpPanel。
我知道导致空指针异常的原因，但在这里我已经初始化了每个视图。帮帮我。
BaseActivity.java：
@Override
protected void onCreate(@Nullable Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.base_activity);
prefs = getSharedPreferences(" com.musicplayer.musicana", MODE_PRIVATE);
mContext = BaseActivity.this;
shareSong = findViewById(R.id.shareSong);
shareSong.setVisibility(View.INVISIBLE);
nowPlaying = findViewById(R.id.nowPlaying);
downArrow = findViewById(R.id.downArrow);
downArrow.setVisibility(View.INVISIBLE);
nowPlaying.setAlpha(0);
backgroundImage = findViewById(R.id.background_image);
shuffleSong = findViewById(R.id.shuffleSong);
repeatSong = findViewById(R.id.repeatSong);
nextSong= findViewById(R.id.nextImage);
previousImage = findViewById(R.id.previousImage);
newlr = findViewById(R.id.newlr);
PlayPauseImage = findViewById(R.id.playpauseImage);
durationTimer = findViewById(R.id.durationTimer);
circleImage = findViewById(R.id.circularImage);
circularSeekBar = findViewById(R.id.circularSeekBar);
circularSeekBar.setEnabled(false);
fullSongName = findViewById(R.id.fullSongName);
fullArtistName = findViewById(R.id.fullArtistName);
fullSongName.setAlpha(0);
fullArtistName.setAlpha(0);
linearLayoutSlide = findViewById(R.id.linearLayoutSlide);
playSlideImage = findViewById(R.id.songButton);
backarrow = findViewById(R.id.imageView);
SongNameSlide = findViewById(R.id.SongNameSlide);
ArtistNameSlide = findViewById(R.id.ArtistNameSlide);
storageUtil = new StorageUtil(getApplicationContext());
slidingUpPanelLayout = (SlidingUpPanelLayout) findViewById(R.id.sliding_layout);
playSlideImage.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
if(playPause)
ButtonPlay();
startService(new Intent(BaseActivity.this, MediaPlayerService.class));
Intent is3 = new Intent(ACTION_PLAY_SLIDE_PLAY_PAUSE);
sendBroadcast(is3);
playPause = false;
else
ButtonPause();
startService(new Intent(BaseActivity.this, MediaPlayerService.class));
Intent is3 = new Intent(ACTION_PLAY_SLIDE_PLAY_PAUSE);
sendBroadcast(is3);
);
PlayPauseImage.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent is2 = new Intent(ACTION_PLAY_PLAY_PAUSE);
sendBroadcast(is2);
);
nextSong.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent is = new Intent(ACTION_PLAY_NEXT);
sendBroadcast(is);
);
previousImage.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent is1 = new Intent(ACTION_PLAY_PREVIOUS);
sendBroadcast(is1);
);
shuffleSong.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent is4 = new Intent(ACTION_PLAY_SHUFFLE);
sendBroadcast(is4);
);
repeatSong.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent is5 = new Intent(ACTION_PLAY_REPEAT);
sendBroadcast(is5);
);
shareSong.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent is6 = new Intent(ACTION_PLAY_SHARE);
sendBroadcast(is6);
);
downArrow.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
slidingUpPanelLayout.setPanelState(SlidingUpPanelLayout.PanelState.COLLAPSED);
);
backarrow.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
resideMenu.openMenu(ResideMenu.DIRECTION_LEFT);
);
//
// slidingUpPanelLayout.setPanelState(SlidingUpPanelLayout.PanelState.HIDDEN);
slidingUpPanelLayout.addPanelSlideListener(new SlidingUpPanelLayout.PanelSlideListener()
@Override
public void onPanelSlide(View panel, float slideOffset)
Log.i(TAG, "onPanelSlide, offset " + slideOffset);
SongNameSlide.setAlpha(1 - slideOffset);
ArtistNameSlide.setAlpha(1 - slideOffset);
playSlideImage.setAlpha(1 - slideOffset);
fullSongName.setAlpha(slideOffset);
fullArtistName.setAlpha(slideOffset);
nowPlaying.setAlpha(slideOffset);
downArrow.setVisibility(View.VISIBLE);
downArrow.setAlpha(slideOffset);
shareSong.setVisibility(View.VISIBLE);
shareSong.setAlpha(slideOffset);
resideMenu.addIgnoredView(panel);
@Override
public void onPanelStateChanged(View panel, SlidingUpPanelLayout.PanelState previousState, SlidingUpPanelLayout.PanelState newState)
slidingUpPanelLayout.setDragView(panel);
if (newState.equals(SlidingUpPanelLayout.PanelState.EXPANDED))
playSlideImage.setEnabled(false);
else if (newState.equals(SlidingUpPanelLayout.PanelState.COLLAPSED))
playSlideImage.setEnabled(true);
);
MainActivity.java：
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = MainActivity.this;
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
Window w = getWindow(); // in Activity's onCreate() for instance
w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
sectionsPageAdapter = new SectionsPageAdapter(getSupportFragmentManager());
viewPager = (ParallaxViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
viewPager.setOffscreenPageLimit(6);
smartTabLayout = (SmartTabLayout) findViewById(R.id.viewpagertab);
smartTabLayout.setViewPager(viewPager);
setUpMenu();
base_activity.xml：
<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout
xmlns:sothree="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/sliding_layout"
android:layout_
android:layout_
android:gravity="bottom"
sothree:umanoPanelHeight="70dp"
sothree:umanoShadowHeight="10dp"
android:background="#b9ffffff">
<RelativeLayout
android:id="@+id/relativeLayout"
android:layout_
android:layout_>
</RelativeLayout>
<RelativeLayout
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/linearLayoutSlide"
android:layout_
android:layout_
android:layout_marginTop="25dp"
android:orientation="horizontal"
tools:context="com.musicplayer.musicana"
>
<ImageView
android:id="@+id/background_image"
android:layout_
android:layout_
android:src="@drawable/party"
android:scaleType="centerCrop"/>
<LinearLayout
android:id="@+id/newlr"
android:layout_
android:layout_
android:background="#bd3b3838"
>
<LinearLayout
android:layout_
android:layout_
android:orientation="vertical"
android:paddingTop="15dp"
>
<TextView
android:id="@+id/SongNameSlide"
android:layout_
android:layout_
android:singleLine="true"
android:text="Closer"
android:textSize="15sp"
android:textColor="#ffffff"
android:paddingLeft="20dp"/>
<TextView
android:id="@+id/ArtistNameSlide"
android:layout_
android:layout_
android:singleLine="true"
android:text="Chainsmokers"
android:textSize="10sp"
android:textColor="#ffffff"
android:paddingLeft="20dp"
/>
</LinearLayout>
<RelativeLayout
android:layout_
android:layout_>
<ImageView
android:id="@+id/songButton"
android:layout_
android:layout_
android:src="@drawable/play_song"
android:layout_marginTop="18dp"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="13dp"
android:layout_marginEnd="13dp">
</ImageView>
</RelativeLayout>
</LinearLayout>
<de.hdodenhof.circleimageview.CircleImageView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/circularImage"
android:layout_
android:layout_
android:layout_marginTop="85dp"
android:layout_centerHorizontal="true"/>
<me.tankery.lib.circularseekbar.CircularSeekBar
android:id="@+id/circularSeekBar"
android:layout_
android:layout_
android:layout_marginTop="60dp"
android:layout_centerHorizontal="true"
app:cs_circle_progress_color = "#ffffff"
app:cs_pointer_stroke_width = "10dp"
app:cs_pointer_halo_width = "10dp"
app:cs_pointer_color = "#ffffff"
app:cs_pointer_halo_color_ontouch = "#55ffffff"
/>
<LinearLayout
android:layout_
android:layout_
android:orientation="vertical"
android:layout_marginTop="390dp"
android:layout_centerHorizontal="true"
>
<TextView
android:id="@+id/fullSongName"
android:layout_
android:layout_
android:gravity="center"
android:maxLines="1"
android:textSize="16sp"
android:textColor="#ffffff"
android:text="SongName appears here"/>
<TextView
android:id="@+id/fullArtistName"
android:layout_
android:layout_
android:layout_gravity="center"
android:maxLines="1"
android:textSize="10sp"
android:textColor="#ffffff"
android:paddingTop="10dp"
android:text="\nArtistName appears here"/>
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayoutsong"
android:layout_
android:layout_
android:layout_alignParentTop="true"
android:orientation="horizontal">
<ImageView
android:id="@+id/downArrow"
android:layout_
android:layout_
android:paddingTop="7dp"
android:paddingLeft="5dp"
android:clickable="true"
android:src="@drawable/down_arrow"/>
<TextView
android:id="@+id/nowPlaying"
android:layout_
android:layout_
android:text="Now Playing"
android:textColor="#ffffff"
android:textSize="20sp"
android:paddingLeft="20dp"
android:paddingTop="10dp"/>
<ImageView
android:id="@+id/shareSong"
android:layout_
android:layout_
android:src="@drawable/share_song"
android:clickable="true"
android:paddingTop="7dp"
android:paddingLeft="130dp"/>
</LinearLayout>
<LinearLayout
android:layout_
android:layout_
android:layout_marginTop="150dp"
android:layout_centerHorizontal="true">
<TextView
android:id="@+id/durationTimer"
android:layout_
android:layout_
android:textSize="70sp"
android:textColor="#ffffff"
/>
</LinearLayout>
<LinearLayout
android:id="@+id/playbackControls"
android:layout_
android:layout_
android:layout_centerHorizontal="true"
android:layout_marginTop="450dp"
android:paddingTop="5dp"
android:orientation="horizontal">
<ImageView
android:id="@+id/shuffleSong"
android:layout_
android:layout_
android:src="@drawable/shuffle_song"
android:clickable="true"
android:padding="15dp"/>
<ImageView
android:id="@+id/previousImage"
android:layout_
android:layout_
android:src="@drawable/previous_song"
android:padding="15dp"
android:clickable="true"/>
<ImageView
android:id="@+id/playpauseImage"
android:layout_
android:layout_
android:padding="15dp"
android:src="@drawable/play_song"
android:clickable="true"/>
<ImageView
android:id="@+id/nextImage"
android:layout_
android:layout_
android:padding="15dp"
android:src="@drawable/next_song"
android:clickable="true"/>
<ImageView
android:id="@+id/repeatSong"
android:layout_
android:layout_
android:src="@drawable/repeat_song"
android:clickable="true"
android:padding="15dp"/>
</LinearLayout>
</RelativeLayout>
</com.sothree.slidinguppanel.SlidingUpPanelLayout>
activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:id="@+id/relativeLayout">
<li.yohan.parallax.ParallaxViewPager
android:id="@+id/viewpager"
android:layout_
android:layout_
android:background="@drawable/party"
/>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_
android:layout_
android:paddingTop="30dp">
<TextView
android:layout_
android:layout_
android:layout_alignParentTop="true"
android:layout_gravity="center"
android:gravity="center"
android:text="Musicana"
android:typeface="sans"
android:textAllCaps="false"
android:textColor="#ffffff"
android:textSize="25sp" />
<ImageView
android:id="@+id/imageView"
android:layout_
android:layout_
android:layout_above="@+id/viewpagertab"
android:clickable="true"
app:srcCompat="@drawable/ic_action_keyboard_arrow_right" />
</android.support.v7.widget.Toolbar>
<com.ogaclejapan.smarttablayout.SmartTabLayout
android:id="@+id/viewpagertab"
android:layout_
android:layout_
android:layout_below="@+id/toolbar"
app:stl_indicatorAlwaysInCenter="false"
app:stl_indicatorWithoutPadding="false"
app:stl_indicatorInFront="false"
app:stl_indicatorInterpolation="smart"
app:stl_indicatorGravity="center"
app:stl_indicatorColor="#6a000000"
app:stl_indicatorThickness="30dp"
app:stl_indicatorWidth="110dp"
app:stl_indicatorCornerRadius="10dp"
app:stl_overlineColor="#4D000000"
app:stl_overlineThickness="0dp"
app:stl_underlineColor="#ffffff"
app:stl_underlineThickness="0dp"
app:stl_dividerColor="#ffffff"
app:stl_dividerThickness="0dp"
app:stl_defaultTabBackground="?attr/selectableItemBackground"
app:stl_defaultTabTextAllCaps="false"
app:stl_defaultTabTextColor="#ffffff"
app:stl_defaultTabTextSize="16sp"
app:stl_defaultTabTextHorizontalPadding="30dp"
app:stl_defaultTabTextMinWidth="0dp"
app:stl_distributeEvenly="false"
app:stl_clickable="true"
app:stl_titleOffset="24dp"
app:stl_drawDecorationAfterTab="false"
app:stl_customTabTextLayoutId="@layout/custom_tab_with_typeface"
app:stl_customTabTextViewId="@+id/custom_text"
/>
</RelativeLayout>
Logcat：
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.musicplayer.musicana.BaseActivity.onCreate(BaseActivity.java:243)
at com.musicplayer.musicana.MainActivity.onCreate(MainActivity.java:121)
【问题讨论】：
【参考方案1】：我查看了您的代码，但在您在 BaseActivity.java 中投射的 base_activity.xml 中找不到任何用于后退箭头的 Imageview。检查 BaseActivity.java 中的以下行，您可能绑定了错误的 id，这就是您得到空指针异常的原因。
backarrow = findViewById(R.id.imageView);
您的 base_activity 内容也不会显示在 MainActivity 中，只是因为您的 base_activity 内容替换为 main_activity 内容。
为了像这样在你的base_activity中添加一个视图（FrameLayout），就像this.where你的main_activity内容添加。
<FrameLayout
android:id="@+id/container"
android:layout_
android:layout_/>
然后你的 MainActivity.java 不使用 setContentView() 方法删除它并使用下面的代码。它膨胀你的视图。就是这样，它的工作原理
LayoutInflater inflater = LayoutInflater.from(this);
View view = inflater.inflate(R.layout.activity_main, null);
FrameLayout container = (FrameLayout) findViewById(R.id.container);
container.addView(view);
【讨论】：
是的，对不起，我忘了提。你是对的，但现在 SlidingUpPanel 没有显示出来。任何想法，如何纠正它？ @Rektirino 只是因为您的 BaseActivity 内容替换为您的 MainActivity 内容 我该怎么做？通过覆盖 BASEActivity 的 setCONtentView()？ 好的，我明白了。如果我必须使用 MainActivity 和另外两个活动怎么办。我的意思是如果我想在另外两个活动中与 mainActivity 一起显示slidingUpPanel？ 好的，我明白了。如果我必须使用 MainActivity 和另外两个活动怎么办。我的意思是如果我想在另外两个活动中与 mainActivity 一起显示slidingUpPanel？以上是关于无法在所有活动中添加 SlidingUpPanel的主要内容，如果未能解决你的问题，请参考以下文章
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