android - Getting a callback error -
when try run app particular activity:-
package com.justforyou.bestnarutosongs; import android.content.context; import android.media.audiomanager; import android.media.mediaplayer; import android.os.bundle; import android.os.handler; import android.support.v7.app.appcompatactivity; import android.view.view; import android.view.windowmanager; import android.widget.adapterview; import android.widget.imagebutton; import android.widget.imageview; import android.widget.listview; import android.widget.seekbar; import android.widget.textview; import java.util.arraylist; public class songslistactivity extends appcompatactivity //implements view.onclicklistener { public imagebutton p_and_p = (imagebutton) findviewbyid(r.id.p_and_p); public imagebutton stop = (imagebutton) findviewbyid(r.id.imagebutton5); public textview named = (textview) findviewbyid(r.id.textview3); public textview rated = (textview) findviewbyid(r.id.textview4); public seekbar seek_bar = (seekbar) findviewbyid(r.id.seekbar); public boolean ispaused = false; public int old_song = -326523; private mediaplayer mediaplayer; private audiomanager maudiomanager; public handler seekhandler = new handler (); private audiomanager.onaudiofocuschangelistener monaudiofocuschangelistener = new audiomanager.onaudiofocuschangelistener() { @override public void onaudiofocuschange(int focuschange){ if(focuschange == audiomanager.audiofocus_loss_transient_can_duck || focuschange == audiomanager.audiofocus_loss_transient){ mediaplayer.pause(); mediaplayer.seekto(0); } else if(focuschange == audiomanager.audiofocus_gain){ mediaplayer.start(); } else if(focuschange == audiomanager.audiofocus_loss){ if(mediaplayer != null) { mediaplayer.release(); mediaplayer = null; } } } }; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); getwindow().setflags(windowmanager.layoutparams.flag_fullscreen, windowmanager.layoutparams.flag_fullscreen); setcontentview(r.layout.activity_songs_list); seekupdation(); maudiomanager = (audiomanager) getsystemservice(context.audio_service); final arraylist<songs> song = new arraylist<>(); song.add(new songs("anger", "rate: 4.5", r.raw.anger, r.drawable.anger )); song.add(new songs("daylight of konoha", "rate: 4.7", r.raw.d_o_k, r.drawable.d_o_k )); song.add(new songs("experienced many battles", "rate: 4.0", r.raw.experienced_many_battles, r.drawable.e_m_b )); song.add(new songs("gekiha", "rate: 4.0", r.raw.gekiha, r.drawable.gekiha )); song.add(new songs("genshi", "rate: 3.0", r.raw.genshi, r.drawable.genshi )); song.add(new songs("girei", "rate: 4.5", r.raw.girei, r.drawable.girei )); song.add(new songs("hidan", "rate: 3.0", r.raw.hidan, r.drawable.hidan )); song.add(new songs("homecoming", "rate: 3.0", r.raw.homecoming, r.drawable.homecoming )); song.add(new songs("naruto main theme", "rate: 5.0", r.raw.naruto_main_theme, r.drawable.narutomt )); song.add(new songs("saika", "rate: 4.5", r.raw.saika, r.drawable.saika )); song.add(new songs("senya(itachi's theme)", "rate: 5.0", r.raw.senya, r.drawable.senya )); song.add(new songs("shirotsumekusa", "rate: 3.0", r.raw.shirotsumekusa, r.drawable.shirot )); song.add(new songs("turn over", "rate: 4.5", r.raw.turn_over, r.drawable.turn_over )); p_and_p.setonclicklistener(new view.onclicklistener() { @override public void onclick(view view) { if(mediaplayer != null) { if(!mediaplayer.isplaying() || ispaused) { p_and_p.setimageresource(r.drawable.ic_play_arrow_white_48dp); ispaused = false; int result = maudiomanager.requestaudiofocus(monaudiofocuschangelistener, audiomanager.stream_music, audiomanager.audiofocus_gain_transient); if (result == audiomanager.audiofocus_request_granted) { mediaplayer.start(); mediaplayer.setoncompletionlistener(new mediaplayer.oncompletionlistener() { @override public void oncompletion(mediaplayer mediaplayer) { if (mediaplayer != null) { mediaplayer.release(); mediaplayer = null; maudiomanager.abandonaudiofocus(monaudiofocuschangelistener); } } }); } } else { p_and_p.setimageresource(r.drawable.ic_pause_white_48dp);//////////////////////////////////////////////////////////////////// ispaused = true; mediaplayer.pause(); } } } }); stop.setonclicklistener(new view.onclicklistener() { @override public void onclick(view view) { if(mediaplayer != null) { mediaplayer.pause(); mediaplayer.seekto(0); ispaused = true; } } }); songsadapter songadapter = new songsadapter(this, song, r.color.main_color); listview listview = (listview) findviewbyid(r.id.list_col); listview.setadapter(songadapter); listview.setonitemclicklistener (new adapterview.onitemclicklistener() { @override public void onitemclick(adapterview<?> adapterview, view view, int i, long l) { int current_song; songs song = song.get(i); //if mediaplayer not used before, make oldsong present song. if (old_song == -326523) { old_song = song.getsong(); } current_song = song.getsong(); imageview ivp_p = (imageview) findviewbyid(r.id.p_pimage); //if mediaplayer paused. if (ispaused) { //if song paused same new song. if(current_song == old_song) { mediaplayer.start(); } //if song paused not new song. else { if (mediaplayer != null) { mediaplayer.release(); mediaplayer = null; } int result = maudiomanager.requestaudiofocus(monaudiofocuschangelistener, audiomanager.stream_music, audiomanager.audiofocus_gain_transient); if (result == audiomanager.audiofocus_request_granted) { mediaplayer = mediaplayer.create(songslistactivity.this, song.getsong()); old_song = song.getsong(); mediaplayer.start(); mediaplayer.setoncompletionlistener(new mediaplayer.oncompletionlistener() { @override public void oncompletion(mediaplayer mediaplayer) { if (mediaplayer != null) { mediaplayer.release(); mediaplayer = null; maudiomanager.abandonaudiofocus(monaudiofocuschangelistener); } } }); } } ispaused = false; } else if (mediaplayer != null) { //if mediaplayer playing song. if (mediaplayer.isplaying()) { mediaplayer.pause(); ivp_p.setimageresource(r.drawable.ic_play_arrow_black_24dp); ispaused = true; } } //if mediaplayer used first time , if mediaplayer neither paused else { if (mediaplayer != null) { mediaplayer.release(); mediaplayer = null; } int result = maudiomanager.requestaudiofocus(monaudiofocuschangelistener, audiomanager.stream_music, audiomanager.audiofocus_gain_transient); if (result == audiomanager.audiofocus_request_granted) { mediaplayer = mediaplayer.create(songslistactivity.this, song.getsong()); old_song = song.getsong(); mediaplayer.start(); mediaplayer.setoncompletionlistener(new mediaplayer.oncompletionlistener() { @override public void oncompletion(mediaplayer mediaplayer) { if (mediaplayer != null) { mediaplayer.release(); mediaplayer = null; maudiomanager.abandonaudiofocus(monaudiofocuschangelistener); } } }); } } } } ); } runnable run = new runnable (){ @override public void run() { seekupdation(); } }; public void seekupdation() { if(mediaplayer != null) { seek_bar.setprogress(mediaplayer.getcurrentposition()); seekhandler.postdelayed(run, 1000); } } @override protected void onstop() { super.onstop(); if(mediaplayer != null) { mediaplayer.release(); mediaplayer = null; } } } gives error:-
08-08 14:39:41.281 1730-1730/com.justforyou.bestnarutosongs e/androidruntime: fatal exception: main process: com.justforyou.bestnarutosongs, pid: 1730 java.lang.runtimeexception: unable instantiate activity componentinfo{com.justforyou.bestnarutosongs/com.justforyou.bestnarutosongs.songslistactivity}: java.lang.nullpointerexception: attempt invoke virtual method 'android.view.window$callback android.view.window.getcallback()' on null object reference @ android.app.activitythread.performlaunchactivity(activitythread.java:2444) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2613) @ android.app.activitythread.access$800(activitythread.java:181) @ android.app.activitythread$h.handlemessage(activitythread.java:1473) @ android.os.handler.dispatchmessage(handler.java:111) @ android.os.looper.loop(looper.java:194) @ android.app.activitythread.main(activitythread.java:5649) @ java.lang.reflect.method.invoke(native method) @ java.lang.reflect.method.invoke(method.java:372) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:959) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:754) caused by: java.lang.nullpointerexception: attempt invoke virtual method 'android.view.window$callback android.view.window.getcallback()' on null object reference @ android.support.v7.app.appcompatdelegateimplbase.<init>(appcompatdelegateimplbase.java:72) @ android.support.v7.app.appcompatdelegateimplv7.<init>(appcompatdelegateimplv7.java:146) @ android.support.v7.app.appcompatdelegateimplv11.<init>(appcompatdelegateimplv11.java:28) @ android.support.v7.app.appcompatdelegateimplv14.<init>(appcompatdelegateimplv14.java:41) @ android.support.v7.app.appcompatdelegate.create(appcompatdelegate.java:193) @ android.support.v7.app.appcompatdelegate.create(appcompatdelegate.java:173) @ android.support.v7.app.appcompatactivity.getdelegate(appcompatactivity.java:511) @ android.support.v7.app.appcompatactivity.findviewbyid(appcompatactivity.java:183) @ com.justforyou.bestnarutosongs.songslistactivity.<init>(songslistactivity.java:23) @ java.lang.reflect.constructor.newinstance(native method) @ java.lang.class.newinstance(class.java:1606) @ android.app.instrumentation.newactivity(instrumentation.java:1071) @ android.app.activitythread.performlaunchactivity(activitythread.java:2434) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2613) @ android.app.activitythread.access$800(activitythread.java:181) @ android.app.activitythread$h.handlemessage(activitythread.java:1473) @ android.os.handler.dispatchmessage(handler.java:111) @ android.os.looper.loop(looper.java:194) @ android.app.activitythread.main(activitythread.java:5649) @ java.lang.reflect.method.invoke(native method) @ java.lang.reflect.method.invoke(method.java:372) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:959) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:754) can tell me, causing error? here xml file :-
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_height="match_parent" android:layout_width="match_parent"> <relativelayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="0.58" android:background="@color/player_color"> <linearlayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="2.27"> <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:weightsum="1"> <imageview android:layout_width="100dp" android:layout_height="100dp" android:id="@+id/imageview" /> <linearlayout android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <textview android:layout_width="match_parent" android:layout_height="0dp" android:text="please select song" android:textappearance="?android:textappearancemedium" android:textstyle="bold" android:id="@+id/textview3" android:layout_weight="1" android:gravity="bottom" /> <textview android:layout_width="match_parent" android:layout_height="0dp" android:text="" android:id="@+id/textview4" android:layout_weight="1" /> </linearlayout> </linearlayout> </linearlayout> <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> <imagebutton android:layout_width="wrap_content" android:layout_height="match_parent" android:id="@+id/repeat" android:layout_weight="1" android:background="@color/player_color" android:src="@drawable/ic_repeat_white_48dp" /> <imagebutton android:layout_width="wrap_content" android:layout_height="match_parent" android:id="@+id/previous" android:layout_weight="1" android:background="@color/player_color" android:src="@drawable/ic_skip_previous_white_48dp" /> <imagebutton android:layout_width="wrap_content" android:layout_height="match_parent" android:id="@+id/p_and_p" android:layout_weight="1" android:src="@drawable/ic_play_arrow_white_48dp" android:background="@color/player_color" /> <imagebutton android:layout_width="wrap_content" android:layout_height="match_parent" android:id="@+id/next" android:layout_weight="1" android:background="@color/player_color" android:src="@drawable/ic_skip_next_white_48dp" /> <relativelayout android:layout_width="wrap_content" android:layout_height="match_parent"> <imagebutton android:padding="11dp" android:layout_width="wrap_content" android:layout_height="match_parent" android:id="@+id/imagebutton5" android:background="@color/player_color" android:src="@drawable/control_stop" android:scaletype="centerinside" android:layout_centervertical="true" android:layout_alignparentstart="true" /> </relativelayout> </linearlayout> <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:weightsum="1" android:gravity="center_vertical"> <textview android:layout_width="wrap_content" android:layout_height="match_parent" android:text="00:00" android:id="@+id/textview" android:gravity="center_vertical" /> <seekbar android:layout_width="0dp" android:layout_height="wrap_content" android:id="@+id/seekbar" android:layout_weight="1" /> <textview android:layout_width="wrap_content" android:layout_height="match_parent" android:text="00:00" android:id="@+id/textview2" android:gravity="center_vertical" /> </linearlayout> </linearlayout> </linearlayout> </relativelayout> <listview android:id="@+id/list_col" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:layout_gravity="bottom" android:drawselectorontop="true" android:orientation="vertical" tools:context="com.justforyou.bestnarutosongs.songslistactivity" style="centrecrop" /> while rendering xml file, gives me error:-
are these 2 errors related or not. best solution problem? appreciated.
you should put snippet
public imagebutton p_and_p = (imagebutton) findviewbyid(r.id.p_and_p); public imagebutton stop = (imagebutton) findviewbyid(r.id.imagebutton5); public textview named = (textview) findviewbyid(r.id.textview3); public textview rated = (textview) findviewbyid(r.id.textview4); public seekbar seek_bar = (seekbar) findviewbyid(r.id.seekbar); in oncreate() under :setcontentview(r.layout.activity_songs_list);
Comments
Post a Comment