Android 活动未启动，空指针异常
当我尝试调用活动时，我的应用程序崩溃。它也使用数据库，但问题可能不存在。它在使用setText方法的行上显示错误。有人能提出一些解决办法吗。提前谢谢 这是我的密码Android 活动未启动，空指针异常,android,Android,当我尝试调用活动时，我的应用程序崩溃。它也使用数据库，但问题可能不存在。它在使用setText方法的行上显示错误。有人能提出一些解决办法吗。提前谢谢 这是我的密码 public class EventsShower extends BaseActivity{ private DBHelper dbHelper; private SQLiteDatabase db; private Cursor cursor; private int[] colors =
public class EventsShower extends BaseActivity{
private DBHelper dbHelper;
private SQLiteDatabase db;
private Cursor cursor;
private int[] colors = new int[2];
private String eventS, dateS, timeS, done;
// @Override
// protected void onDestroy() {
// db.close();
// dbHelper.close();
// cursor.close();
// super.onDestroy();
// }
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.events_shower);
colors[0] = Color.parseColor("#DF5D5D");
colors[1] = Color.parseColor("#5077C9");
LinearLayout linearLayout = (LinearLayout)findViewById(R.id.linLayout);
LayoutInflater inflater = getLayoutInflater();
// TextView tvEvent = (TextView)findViewById(R.id.tvEvent);
// TextView tvDate = (TextView)findViewById(R.id.tvDate);
// TextView tvTime = (TextView)findViewById(R.id.tvTime);
dbHelper = new DBHelper(this);
db = dbHelper.getWritableDatabase();
String[] columns = new String[]{DBHelper.DATE, DBHelper.TIME, DBHelper.EVENT, DBHelper.DONE};
cursor = db.query(DBHelper.TABLE_NAME, columns, null, null, null, null, null);
cursor.moveToFirst();
do{
View item = inflater.inflate(R.layout.item, linearLayout, false);
// eventS = cursor.getString(cursor.getColumnIndex(DBHelper.EVENT));
// dateS = cursor.getString(cursor.getColumnIndex(DBHelper.DATE));
// timeS = cursor.getString(cursor.getColumnIndex(DBHelper.TIME));
Log.i("myLogs", eventS + "--" + dateS + "--" + timeS);
TextView tvEvent = (TextView)findViewById(R.id.tvEvent);
tvEvent.setText(cursor.getString(cursor.getColumnIndex(DBHelper.EVENT)));
TextView tvDate = (TextView)findViewById(R.id.tvDate);
tvDate.setText(cursor.getString(cursor.getColumnIndex(DBHelper.DATE)));
TextView tvTime = (TextView)findViewById(R.id.tvTime);
tvTime.setText(cursor.getString(cursor.getColumnIndex(DBHelper.TIME)));
if(cursor.getString(cursor.getColumnIndex(DBHelper.DONE)).equals("1")) {
done = "Done";
}else {
done = "Pending";
}
if(cursor.getString(cursor.getColumnIndex(DBHelper.DONE)).equals("1")) {
item.setBackgroundColor(colors[0]);
} else {
item.setBackgroundColor(colors[1]);
}
linearLayout.addView(item);
if(cursor.isLast()) {
// eventS = cursor.getString(cursor.getColumnIndex(DBHelper.EVENT));
// dateS = cursor.getString(cursor.getColumnIndex(DBHelper.DATE));
// timeS = cursor.getString(cursor.getColumnIndex(DBHelper.TIME));
tvEvent.setText(cursor.getString(cursor.getColumnIndex(DBHelper.EVENT)));
tvDate.setText(cursor.getString(cursor.getColumnIndex(DBHelper.DATE)));
tvTime.setText(cursor.getString(cursor.getColumnIndex(DBHelper.TIME)));
if(cursor.getString(cursor.getColumnIndex(DBHelper.DONE)).equals("1")) {
done = "Done";
}else {
done = "Pending";
}
if(cursor.getString(cursor.getColumnIndex(DBHelper.DONE)).equals("1")) {
item.setBackgroundColor(colors[0]);
} else {
item.setBackgroundColor(colors[1]);
}
linearLayout.addView(item);
cursor.close();
}
cursor.moveToNext();
}while(cursor.moveToNext());
}
}
12-05 09:46:08.386 2449-2449/com.example.kg2152.example E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.kg2152.example/com.example.kg2152.example.EventsShower}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.kg2152.example.EventsShower.onCreate(EventsShower.java:60)
at android.app.Activity.performCreate(Activity.java:5133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
View item = inflater.inflate(R.layout.item, linearLayout, false);
TextView tvEvent = (TextView)item.findViewById(R.id.tvEvent);
View item = inflater.inflate(R.layout.item, linearLayout, false);
TextView tvEvent = (TextView)item.findViewById(R.id.tvEvent);
事件显示的60行上有什么？@Suvitruf tvEvent.setTextcursor.getStringcursor.getColumnIndexDBHelper.EVENT；事件显示的60行上有什么？@Suvitruf tvEvent.setTextcursor.getStringcursor.getColumnIndexDBHelper.EVENT；