所以我试图获取实时板球得分，但我在启动文件中收到以下错误。请有人帮帮我
05-31 08:35:56.833: D/AndroidRuntime(1089): Shutting down VM
05-31 08:35:56.833: W/dalvikvm(1089): threadid=1: thread exiting with uncaught exception (group=0x414c4700)
05-31 08:35:56.843: E/AndroidRuntime(1089): FATAL EXCEPTION: main
05-31 08:35:56.843: E/AndroidRuntime(1089): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.cricketscores/com.example.cricketscores.Launching}: java.lang.NullPointerException
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.os.Handler.dispatchMessage(Handler.java:99)
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.os.Looper.loop(Looper.java:137)
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.app.ActivityThread.main(ActivityThread.java:5103)
05-31 08:35:56.843: E/AndroidRuntime(1089): at java.lang.reflect.Method.invokeNative(Native Method)
05-31 08:35:56.843: E/AndroidRuntime(1089): at java.lang.reflect.Method.invoke(Method.java:525)
05-31 08:35:56.843: E/AndroidRuntime(1089): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
05-31 08:35:56.843: E/AndroidRuntime(1089): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-31 08:35:56.843: E/AndroidRuntime(1089): at dalvik.system.NativeStart.main(Native Method)
05-31 08:35:56.843: E/AndroidRuntime(1089): Caused by: java.lang.NullPointerException
05-31 08:35:56.843: E/AndroidRuntime(1089): at com.example.cricketscores.Launching.onCreate(Launching.java:52)
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.app.Activity.performCreate(Activity.java:5133)
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
05-31 08:35:56.843: E/AndroidRuntime(1089): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
05-31 08:35:56.843: E/AndroidRuntime(1089): ... 11 more
这是代码
public class Launching extends Activity {
private List<Match> matches = new ArrayList<Match>();
private MatchesReceiver receiver;
private IntentFilter filter;
private MatchListState oldState;
private MatchAdapter matchAdapter;
private long lastUpdate;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
CricScoreApplication.getInstance().setMatchListState(MatchListState.LOADING);
startService(new Intent(this, MatchUpdateService.class));
this.receiver = new MatchesReceiver();
this.filter = new IntentFilter(GenericProperties.INTENT_ML_UPDATE);
this.matchAdapter = new MatchAdapter(this);
this.oldState = MatchListState.LOADING;
RunningInfo.clearSession(getApplicationContext());
}
@Override
public void onStart() {
super.onStart();
}
@Override
public void onResume() {
super.onResume();
updateScreen();
registerReceiver(receiver, filter);
}
private void updateScreen() {
Log.i(GenericProperties.TAG, "updating screen");
MatchListState state = CricScoreApplication.getInstance()
.getMatchListState();
Resources resources = getResources();
if (MatchListState.LOADING.equals(state)) {
setContentView(R.layout.launching_loading);
Log.i(GenericProperties.TAG, "updating screen - loading");
} else if (MatchListState.LOADED.equals(state)) {
showMatches();
Log.i(GenericProperties.TAG, "updating screen - show matches");
} else if (MatchListState.NODATA.equals(state)) {
showErrorScreen(resources.getString(R.string.error_title_nodata), resources.getString(R.string.error_msg_nodata));
Log.i(GenericProperties.TAG, "updating screen - show error - nodata");
} else if (MatchListState.NOMATCH.equals(state)) {
showErrorScreen(resources.getString(R.string.error_title_nomatch), resources.getString(R.string.error_msg_nomatch));
Log.i(GenericProperties.TAG, "updating screen - show error - nomatch");
} else if (MatchListState.NOTSUPPORTED.equals(state)) {
showErrorScreen(resources.getString(R.string.error_title_nosupport), resources.getString(R.string.error_msg_nosupport));
Log.i(GenericProperties.TAG, "updating screen - show error - nosupport");
} else if (MatchListState.APPERROR.equals(state)){
showErrorScreen(resources.getString(R.string.error_title_apperror), resources.getString(R.string.error_msg_apperror));
Log.i(GenericProperties.TAG, "updating screen - show error - apperror");
}
oldState = state;
Log.i(GenericProperties.TAG, "updating screen ended");
}
@Override
public void onPause() {
super.onPause();
unregisterReceiver(receiver);
}
@Override
public void onStop() {
super.onStop();
}
@Override
public void onDestroy() {
super.onDestroy();
stopService(new Intent(this, ScoreUpdateService.class));
}
private class MatchesReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
long start = System.currentTimeMillis();
if(GenericProperties.INTENT_ML_UPDATE.equals(intent.getAction())){
updateScreen();
}
long time = System.currentTimeMillis() - start;
Log.i(GenericProperties.TAG, "On Receive Time Taken : " + time
+ " ms");
}
}
private void showErrorScreen(String title, String message) {
if(MatchListState.LOADING.equals(oldState) || MatchListState.LOADED.equals(oldState)){
setContentView(R.layout.launching_error);
}
Log.v(GenericProperties.TAG, title + " "+ message);
TextView tilteTextView = (TextView)findViewById(R.id.title);
tilteTextView.setText(title);
TextView messageTextView = (TextView)findViewById(R.id.message_body);
messageTextView.setText(message);
Log.v(GenericProperties.TAG, " "+ messageTextView.getText());
Log.v(GenericProperties.TAG, " "+ messageTextView.getTextSize());
}
private void showMatches() {
if(!oldState.equals(MatchListState.LOADED)){
setContentView(R.layout.matchlist);
final ListView l1 = (ListView) findViewById(R.id.ListMatches);
//l1.set
l1.setAdapter(matchAdapter);
l1.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View view,
int position, long id) {
int mid = ((Match) l1.getItemAtPosition(position)).getMatchId();
openLiveScore(mid);
openScoreUpdateService(mid);
}
});
}
long newUpdateTime = CricScoreApplication.getInstance().getMatchListUpdateTime();
if(newUpdateTime != this.lastUpdate){
CricScoreDBAdapter adapter = new CricScoreDBAdapter(
getApplicationContext());
adapter.open();
this.matches = adapter.getMatches();
adapter.close();
this.matchAdapter.notifyDataSetChanged();
if(this.lastUpdate!=0){
Toast.makeText(getApplicationContext(), R.string.toast_update, Toast.LENGTH_SHORT).show();
}
this.lastUpdate = newUpdateTime;
}
}
private void openScoreUpdateService(int mid) {
Intent serviceIntent = new Intent(
GenericProperties.INTENT_START_UPDATE);
serviceIntent.putExtra("matchId", mid);
startService(serviceIntent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.launching_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.hide:
moveTaskToBack(false);
return true;
case R.id.exit:
//alertAndClose();
Launching.this.finish();
return true;
case R.id.feedback:
Launching.this.feedback();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void feedback() {
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_EMAIL , new String[]{"spriyan@mychoize.com"});
i.putExtra(Intent.EXTRA_SUBJECT, "MyChoize CricScore: Feedback");
i.putExtra(Intent.EXTRA_TEXT , "Please provide your feedback for improvement of CricScore app here.");
i.setType("message/rfc822");
startActivity(Intent.createChooser(i, "Send Feedback"));
}
private void openLiveScore(int id) {
Intent myIntent = new Intent(this, LiveScore.class);
myIntent.putExtra(GenericProperties.EXTRA_MATCHID, id);
startActivity(myIntent);
}
public void alertAndClose() {
Resources resources = getResources();
String str = resources.getString(R.string.confirm_exit);
String exit = resources.getString(R.string.exit);
String cancel = resources.getString(R.string.cancel);
String hide = resources.getString(R.string.hide);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(str);
builder.setCancelable(true);
builder.setNeutralButton(cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
builder.setPositiveButton(exit, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Launching.this.finish();
}
});
builder.setNegativeButton(hide, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
moveTaskToBack(false);
}
});
AlertDialog alert = builder.create();
alert.show();
}
@Override
public void onBackPressed() {
alertAndClose();
return;
}
private class MatchAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public MatchAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return Launching.this.matches.size();
}
public Object getItem(int position) {
return matches.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.matchview, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.TeamOne);
holder.text2 = (TextView) convertView
.findViewById(R.id.TeamTwo);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
try {
Match match = matches.get(position);
holder.text.setText(match.getTeamOne());
holder.text2.setText(match.getTeamTwo());
} catch (ArrayIndexOutOfBoundsException e) {
}
return convertView;
}
class ViewHolder {
TextView text;
TextView text2;
}
}
}
*更新*
CricScoreApplication.java
public class CricScoreApplication extends Application {
private static CricScoreApplication singleton;
private MatchListState matchListState;
private long matchListUpdateTime;
private ScoreUpdateState scoreUpdateState;
private long scoreUpdateTime;
private boolean liveOn;
public static CricScoreApplication getInstance(){
return singleton;
}
@Override
public void onCreate() {
super.onCreate();
singleton = this;
this.matchListState = MatchListState.LOADING;
this.matchListUpdateTime = 0;
}
public MatchListState getMatchListState() {
return matchListState;
}
public void setMatchListState(MatchListState matchListState) {
this.matchListState = matchListState;
}
public long getMatchListUpdateTime() {
return matchListUpdateTime;
}
public void setMatchListUpdateTime(long matchListUpdateTime) {
this.matchListUpdateTime = matchListUpdateTime;
}
public ScoreUpdateState getScoreUpdateState() {
return scoreUpdateState;
}
public void setScoreUpdateState(ScoreUpdateState scoreUpdateState) {
this.scoreUpdateState = scoreUpdateState;
this.scoreUpdateTime = System.currentTimeMillis();
}
public long getScoreUpdateTime() {
return scoreUpdateTime;
}
public void clearScoreUpdateState(){
this.scoreUpdateState = null;
this.scoreUpdateTime = 0L;
}
public boolean isLiveOn() {
//System.out.println("getting value "+liveOn);
return liveOn;
}
public void setLiveOn(boolean liveOn) {
//System.out.println("setting value " +liveOn);
this.liveOn = liveOn;
}
}
清单
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.cricketscores"
android:versionCode="7"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="7"
android:targetSdkVersion="16" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<application android:icon="@drawable/icon" android:label="@string/app_name" android:allowBackup="true" >
<activity android:name=".Launching" android:multiprocess="false" android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Info" android:label="@string/title_info"></activity>
<activity android:name=".activity.SmsFeature" android:label="@string/title_sms_feature"></activity>
<activity android:name=".LiveScore" android:label="@string/title_live_score" android:launchMode="singleTask"></activity>
<activity android:name=".activity.UserPreference" android:label="@string/title_user_preference"></activity>
<service android:name=".MatchUpdateService" android:enabled="true"></service>
<service android:name=".ScoreUpdateService" android:enabled="true">
<intent-filter>
<action android:name="com.example.cricketscores.START_UPDATE" />
<action android:name="com.example.cricketscores.STOP_UPDATE" />
<action android:name="com.example.cricketscores.UPDATE_VALUES" />
</intent-filter>
</service>
</application>
</manifest>
感谢您的帮助
答案 0 :(得分：2)
扩展Application类时，不需要使用经典的单例方法。相反，如果您的清单设置正确，您可以：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//notice the change
CricScoreApplication app = (CricScoreApplication)getApplication();
app.setMatchListState(MatchListState.LOADING);
startService(new Intent(this, MatchUpdateService.class));
this.receiver = new MatchesReceiver();
this.filter = new IntentFilter(GenericProperties.INTENT_ML_UPDATE);
this.matchAdapter = new MatchAdapter(this);
this.oldState = MatchListState.LOADING;
RunningInfo.clearSession(getApplicationContext());
}
为此，您需要将此类指向要在基础Application类上使用的类。这在清单中完成：
<application ... android:name="com.example.cricketscores.CricScoreApplication" >
P.S ：如果您真的想使用getInstance()方法，它应该如下所示：
public static CricScoreApplication getInstance(Context ctx){
return (CricScoreApplication)(ctx.getApplication());
}