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그래서 간단한 음악 플레이어를 만드는 방법에 대한 튜토리얼을 따라 Genemotion에서 올바르게 작동합니다. 이제는 휴대폰에서 실행하고 싶지만 충돌이 발생합니다. 처음부터 여기에 여기에 내 코드간단한 mp3 플레이어는 에뮬레이터에서 제대로 작동하지만 실제 장치에서는 작동하지 않습니다.
package com.bignerdranch.android.musicplayer;
import android.app.ListActivity;
import android.content.Context;
import android.database.Cursor;
import android.media.MediaPlayer;
import android.os.Handler;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import java.io.IOException;
import java.math.BigDecimal;
public class MainActivity extends ListActivity {
private static final int UPDATE_FREQUENCY=500;
private static final int STEP_VALUE=4000;
private MediaCursorAdapter mediaAdapter=null;
private TextView selectedfile=null;
private SeekBar seekbar=null;
private MediaPlayer player=null;
private ImageButton PlayButton=null;
private ImageButton PrevButton=null;
private ImageButton NextButton=null;
private boolean isStarted=true;
private String currentFile="";
private boolean isMovingSeekBar=false;
private final Handler handler=new Handler();
private final Runnable updatepostionRunnable=new Runnable() {
public void run() {
updatePostion();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
selectedfile=(TextView) findViewById(R.id.selectedfile);
seekbar=(SeekBar) findViewById(R.id.seekbar);
PlayButton=(ImageButton)findViewById(R.id.play);
PrevButton=(ImageButton)findViewById(R.id.prev);
NextButton=(ImageButton)findViewById(R.id.next);
player=new MediaPlayer();
player.setOnCompletionListener(onCompletion);
player.setOnErrorListener(onError);
seekbar.setOnSeekBarChangeListener(seekBarChanged);
Cursor cursor=
getContentResolver().query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,null
,null,null);
if (null !=cursor){
cursor.moveToFirst();
mediaAdapter= new MediaCursorAdapter(this,
R.layout.listitem,cursor);
setListAdapter(mediaAdapter);
PlayButton.setOnClickListener(onButtonClick);
NextButton.setOnClickListener(onButtonClick);
PrevButton.setOnClickListener(onButtonClick);
}
}
@Override
protected void onListItemClick(ListView list,View view,int position,long id)
{
super.onListItemClick(list,view,position,id);
currentFile=(String)view.getTag();
startplay(currentFile);
}
@Override
public void onDestroy(){
super.onDestroy();
handler.removeCallbacks(updatepostionRunnable);
player.stop();
player.reset();
player.release();
player=null;
}
private void startplay(String file){
Log.i("Selected ", file);
selectedfile.setText(file);
seekbar.setProgress(0);
player.stop();
player.reset();
try{
player.setDataSource(file);
player.prepare();
player.start();
}catch (IllegalArgumentException e){
e.printStackTrace();
}catch (IllegalStateException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
seekbar.setMax(player.getDuration());
PlayButton.setImageResource(android.R.drawable.ic_media_pause);
updatePostion();
isStarted=true;
}
private void stopplay(){
player.stop();
player.reset();
PlayButton.setImageResource(android.R.drawable.ic_media_play);
handler.removeCallbacks(updatepostionRunnable);
seekbar.setProgress(0);
isStarted=false;
}
private void updatePostion(){
handler.removeCallbacks(updatepostionRunnable);
seekbar.setProgress(player.getCurrentPosition());
handler.postDelayed(updatepostionRunnable,UPDATE_FREQUENCY);
}
private class MediaCursorAdapter extends SimpleCursorAdapter{
public MediaCursorAdapter(Context context,int layout, Cursor c){
super(context,layout,c,
new String[]{MediaStore.MediaColumns.DISPLAY_NAME,
MediaStore.MediaColumns.TITLE, MediaStore.Audio.AudioColumns.DURATION},
new int[]{R.id.displayname,R.id.title,R.id.duration});
}
@Override
public void bindView(View view, Context context,Cursor cursor){
TextView title = (TextView) view.findViewById(R.id.title);
TextView name = (TextView) view.findViewById(R.id.displayname);
TextView duration = (TextView) view.findViewById(R.id.duration);
name.setText(cursor.getString(
cursor.getColumnIndex(MediaStore.MediaColumns.DISPLAY_NAME)));
title.setText(cursor.getString(
cursor.getColumnIndex(MediaStore.MediaColumns.TITLE)));
long durationInMs=Long.parseLong(cursor.getString(
cursor.getColumnIndex(MediaStore.Audio.AudioColumns.DURATION)));
double durationInMin = ((double) durationInMs /1000.0)/60.0;
durationInMin = new
BigDecimal(Double.toString(durationInMin)).setScale(
2,BigDecimal.ROUND_UP).doubleValue();
duration.setText("" + durationInMin);
view.setTag(cursor.getString(cursor.getColumnIndex
(MediaStore.MediaColumns.DATA)));
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent){
LayoutInflater inflater= LayoutInflater.from(context);
View v=inflater.inflate(R.layout.listitem,parent,false);
bindView(v,context,cursor);
return v;
}
}
private View.OnClickListener onButtonClick=new View.OnClickListener(){
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.play:{
if(player.isPlaying()){
handler.removeCallbacks(updatepostionRunnable);
player.pause();
PlayButton.setImageResource(android.R.drawable.ic_media_play);
}else{
if (isStarted){
player.start();
PlayButton.setImageResource(android.R.drawable.ic_media_pause);
updatePostion();
}else{
startplay(currentFile);
}
}
break;
}
case R.id.next:{
int seekto=player.getCurrentPosition()+STEP_VALUE;
if(seekto>player.getDuration()){
seekto=player.getDuration();
}
player.pause();
player.seekTo(seekto);
player.start();
break;
}
case R.id.prev:{
int seekto=player.getCurrentPosition()- STEP_VALUE;
if (seekto<0){
seekto=0;
}
player.pause();
player.seekTo(seekto);
player.start();
break;
}
}
}
};
private MediaPlayer.OnCompletionListener onCompletion= new
MediaPlayer.OnCompletionListener(){
@Override
public void onCompletion(MediaPlayer mp){
stopplay();
}
};
private MediaPlayer.OnErrorListener onError=new
MediaPlayer.OnErrorListener(){
@Override
public boolean onError(MediaPlayer mp,int what, int extra){
return false;
}
};
private SeekBar.OnSeekBarChangeListener seekBarChanged = new
SeekBar.OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean
fromUser) {
if (isMovingSeekBar){
player.seekTo(progress);
Log.i("OnSeekBarChangeListener","onProgressChanged");
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
isMovingSeekBar=true;
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
isMovingSeekBar=false;
}
};
}
입니다 모니터 오류 일을
04-16 20:25:40.009 2516-2516/? I/SELinux: Function: selinux_android_load_priority [0], There is no sepolicy file.
04-16 20:25:40.039 2516-2516/? I/SELinux: Function: selinux_android_load_priority , spota verifySig and checkHash pass. priority version is VE=SEPF_GT-I9515_4.4.2_0040
04-16 20:25:40.039 2516-2516/? I/SELinux: selinux_android_seapp_context_reload: seapp_contexts file is loaded from /data/security/spota/seapp_contexts
04-16 20:25:40.039 2516-2516/? E/dalvikvm: >>>>> Normal User
04-16 20:25:40.039 2516-2516/? E/dalvikvm: >>>>> com.bignerdranch.android.musicplayer [ userId:0 | appId:10200 ]
04-16 20:25:40.039 2516-2516/? D/dalvikvm: Late-enabling CheckJNI
04-16 20:25:40.139 2516-2516/com.bignerdranch.android.musicplayer I/InstantRun: Instant Run Runtime started. Android package is com.bignerdranch.android.musicplayer, real application class is null.
04-16 20:25:40.149 2516-2516/com.bignerdranch.android.musicplayer W/InstantRun: No instant run dex files added to classpath
04-16 20:25:40.169 2516-2516/com.bignerdranch.android.musicplayer W/ApplicationPackageManager: getCSCPackageItemText()
04-16 20:25:40.169 2516-2516/com.bignerdranch.android.musicplayer I/PersonaManager: getPersonaService() name persona_policy
04-16 20:25:40.219 2516-2516/com.bignerdranch.android.musicplayer D/AbsListView: Get MotionRecognitionManager
04-16 20:25:40.239 2516-2516/com.bignerdranch.android.musicplayer D/ProgressBar: setProgressDrawable drawableHeight = 36
04-16 20:25:40.249 2516-2516/com.bignerdranch.android.musicplayer D/AbsSeekBar: AbsSeekBar Constructor: misSeebarAnimationAvailable = true
04-16 20:25:40.259 2516-2516/com.bignerdranch.android.musicplayer V/MediaPlayer-JNI: native_setup
04-16 20:25:40.259 2516-2516/com.bignerdranch.android.musicplayer V/MediaPlayer: constructor
04-16 20:25:40.259 2516-2516/com.bignerdranch.android.musicplayer V/MediaPlayer: setListener
04-16 20:25:40.319 2516-2516/com.bignerdranch.android.musicplayer D/AbsListView: onVisibilityChanged() is called, visibility : 4
04-16 20:25:40.319 2516-2516/com.bignerdranch.android.musicplayer D/AbsListView: unregisterIRListener() is called
04-16 20:25:40.339 2516-2516/com.bignerdranch.android.musicplayer D/AbsListView: onVisibilityChanged() is called, visibility : 0
04-16 20:25:40.339 2516-2516/com.bignerdranch.android.musicplayer D/AbsListView: unregisterIRListener() is called
04-16 20:25:40.339 2516-2516/com.bignerdranch.android.musicplayer D/AbsListView: unregisterIRListener() is called
04-16 20:25:40.359 2516-2516/com.bignerdranch.android.musicplayer D/AndroidRuntime: Shutting down VM
04-16 20:25:40.359 2516-2516/com.bignerdranch.android.musicplayer W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x420c3da0)
04-16 20:25:40.370 2516-2516/com.bignerdranch.android.musicplayer E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.bignerdranch.android.musicplayer, PID: 2516
java.lang.NumberFormatException: Invalid long: "null"
at java.lang.Long.invalidLong(Long.java:124)
at java.lang.Long.parseLong(Long.java:341)
at java.lang.Long.parseLong(Long.java:318)
at com.bignerdranch.android.musicplayer.MainActivity$MediaCursorAdapter.bindView(MainActivity.java:164)
at android.widget.CursorAdapter.getView(CursorAdapter.java:254)
at android.widget.AbsListView.obtainView(AbsListView.java:2694)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1274)
at android.widget.ListView.onMeasure(ListView.java:1186)
at android.view.View.measure(View.java:17387)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:17387)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:17387)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:17387)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5352)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2533)
at android.view.View.measure(View.java:17387)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2215)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1352)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1551)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1236)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6473)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:803)
at android.view.Choreographer.doCallbacks(Choreographer.java:603)
at android.view.Choreographer.doFrame(Choreographer.java:573)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:789)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5356)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at dalvik.system.NativeStart.main(Native Method)
도와 줘요 그리고이 가장 가능성이 당신
스택 추적을 읽었습니까? (당신은 그 텍스트를 btw가 아닌 스크린 샷으로 게시 할 필요가 있습니다.) 당신이'Adapter'의'bindView() '에서 널에'Long.parseLong()'을 호출했기 때문에'NumberFormatException'을 얻었습니다. '메소드를 호출합니다. –
스택 추적을 업로드했습니다. 예, 읽었습니다. Long.parseLong()이 null 인 이유는 무엇입니까? – Hama
그래, 분명히 'DURATION' 열은 예상 한 것을 반환하지 않습니다. 또는 가끔은 가치가 없다고 생각한다면, 그 가치를 고려하지 않을 것입니다. 'getString()'대신'cursor.getLong()'을 사용할 수 있으며,'Long.parseLong()'호출을 모두 삭제할 수 있습니다. 값. –