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안녕하세요 저는 다음과 같은 얻을 onResume에서 벨소리 볼륨 현재 수준에 따라 선호하는 seekbar의 현재 진행 상황을 설정하려고하면Android NullPointer 예외가 발생 했습니까?
import com.camelCaseD.nsettings.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.preference.Preference;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SeekBar;
import android.widget.TableLayout;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.media.AudioManager;
public class SeekBarPreference extends Preference implements OnSeekBarChangeListener {
private final String TAG = getClass().getName();
private static final int DEFAULT_VALUE = 50;
private int mMinValue = 0;
private int mCurrentValue;
private SeekBar mSeekBar;
private AudioManager mgr=null;
private View mView;
private int mStream;
public SeekBarPreference(Context context, AttributeSet attrs, int stream) {
super(context, attrs);
mStream = stream;
}
public SeekBarPreference(Context context, AttributeSet attrs, int defStyle, int stream) {
super(context, attrs, defStyle);
mStream = stream;
}
@Override
protected View onCreateView(ViewGroup parent){
TableLayout layout = null;
try {
LayoutInflater mInflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
layout = (TableLayout)mInflater.inflate(R.layout.seek_bar_preference, parent, false);
}
catch(Exception e)
{
Log.e(TAG, "Error creating seek bar preference", e);
}
return layout;
}
private void initBar(SeekBar bar, final int stream, View view) {
mgr=(AudioManager)getContext().getSystemService(Context.AUDIO_SERVICE);
bar.setMax(mgr.getStreamMaxVolume(stream));
bar.setProgress(mgr.getStreamVolume(stream));
TextView mTitle = (TextView) view.findViewById(android.R.id.title);
TextView mSummary = (TextView) view.findViewById(android.R.id.summary);
switch(stream) {
case AudioManager.STREAM_RING:
mTitle.setText("Ringer Volume");
mSummary.setText("Slide to adjust ringer volume.");
break;
case AudioManager.STREAM_MUSIC:
mTitle.setText("Media Volume");
mSummary.setText("Slide to adjust media volume.");
break;
}
bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
public void onProgressChanged(SeekBar bar, int progress,
boolean fromUser) {
mgr.setStreamVolume(stream, progress,
AudioManager.FLAG_PLAY_SOUND);
}
public void onStartTrackingTouch(SeekBar bar) {
// no-op
}
public void onStopTrackingTouch(SeekBar bar) {
// no-op
}
});
}
@Override
public void onBindView(View view) {
super.onBindView(view);
try
{
mView = view;
mSeekBar = (SeekBar) view.findViewById(R.id.seek_bar);
initBar(mSeekBar, mStream, view);
}
catch(Exception ex) {
Log.e(TAG, "Error binding view: " + ex.toString());
}
updateView(view);
}
/**
* Update a SeekBarPreference view with our current state
* @param view
*/
protected void updateView(View view) {
try {
TableLayout layout = (TableLayout)view;
mSeekBar.setProgress(mCurrentValue - mMinValue);
}
catch(Exception e) {
Log.e(TAG, "Error updating seek bar preference", e);
}
}
@Override
protected Object onGetDefaultValue(TypedArray ta, int index){
int defaultValue = ta.getInt(index, DEFAULT_VALUE);
return defaultValue;
}
@Override
protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
}
public void setProgressC(int stream) {
mgr=(AudioManager)getContext().getSystemService(Context.AUDIO_SERVICE);
switch(stream) {
case AudioManager.STREAM_RING:
SeekBar bar = (SeekBar)mView.findViewById(R.id.seek_bar);
bar.setProgress(mgr.getStreamVolume(AudioManager.STREAM_RING));
break;
}
}
}
12-31 22:02:12.559: E/AndroidRuntime(266): java.lang.RuntimeException: Unable to resume activity {com.camelCaseD.nsettings/com.camelCaseD.nsettings.Toggles}: java.lang.NullPointerException
12-31 22:02:12.559: E/AndroidRuntime(266): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2120)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2135)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1668)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.os.Handler.dispatchMessage(Handler.java:99)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.os.Looper.loop(Looper.java:123)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.app.ActivityThread.main(ActivityThread.java:3683)
12-31 22:02:12.559: E/AndroidRuntime(266): at java.lang.reflect.Method.invokeNative(Native Method)
12-31 22:02:12.559: E/AndroidRuntime(266): at java.lang.reflect.Method.invoke(Method.java:507)
12-31 22:02:12.559: E/AndroidRuntime(266): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-31 22:02:12.559: E/AndroidRuntime(266): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-31 22:02:12.559: E/AndroidRuntime(266): at dalvik.system.NativeStart.main(Native Method)
12-31 22:02:12.559: E/AndroidRuntime(266): Caused by: java.lang.NullPointerException
12-31 22:02:12.559: E/AndroidRuntime(266): at com.camelCaseD.nsettings.SeekBarPreference.setProgressC(SeekBarPreference.java:215)
12-31 22:02:12.559: E/AndroidRuntime(266): at com.camelCaseD.nsettings.Toggles.onResume(Toggles.java:112)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1150)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.app.Activity.performResume(Activity.java:3832)
12-31 22:02:12.559: E/AndroidRuntime(266): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2110)
12-31 22:02:12.559: E/AndroidRuntime(266): ... 12 more
가 SeekBarPreference 클래스입니다
뷰 클래스는 Preference 확장 뷰의 레이아웃은 다음과 같다 :
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res/com.commonsware.android.syssvc.volume"
android:stretchColumns="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="20px"
android:paddingRight="10px"
>
<TableRow android:paddingTop="10px"
android:paddingBottom="2px" >
<TextView android:id="@android:id/title" android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="22dp"
android:typeface="sans"
android:textStyle="normal"
android:textColor="#ffffff" />
</TableRow>
<TableRow android:paddingTop="2px"
android:paddingBottom="2px" >
<TextView android:id="@android:id/summary"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</TableRow>
<TableRow
android:paddingBottom="20px">
<SeekBar
android:id="@+id/seek_bar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</TableRow>
</TableLayout>
PreferenceActivity 클래스 내부에 그런 6,
은 :
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
PreferenceCategory mAudCat = (PreferenceCategory) findPreference("audCat");
SeekBarPreference mRingerVol = new SeekBarPreference(this, null, AudioManager.STREAM_RING);
mRingerVol.setKey("ringerVol");
mAudCat.addPreference(mRingerVol);
}
@Override
public void onResume() {
super.onResume();
SeekBarPreference mRingerVol = (SeekBarPreference) findPreference("ringerVol");
mRingerVol.setProgressC(AudioManager.STREAM_RING);
}
어떤 도움이 크게 감사합니다.
setProgressC의 어느 행이 215입니까? –
'setProgressC()'의 어떤 코드 라인이 예외를 던집니까? 'SeekBarPreference'의 나머지 부분은 어떻게 생겼습니까? – tomtheguvnor
(Alex는 트레이스에서 유일하게 유용한 라인을 참조하고 있습니다 :'at com.camelCaseD.nsettings.SeekBarPreference.setProgressC (SeekBarPreference.java:215)'<- 당신 * 코드 :-) –