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PONeed help reading from SQLite database for Android
 

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  1. PONeed help reading from SQLite database for Android
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    <p>I have read through many sites and tutorials and have been unable to solve my problem. I have an application that works until I try to read from my database (it opens it just fine). I know its not the right way to do things but I have two global strings that I pass from my main activity to my DataBaseHelper class (<code>DB_TABLE</code> and <code>spinnerPipeLengthText</code>). When I call the following line of code to retrieve the data from all the columns in a specific row my application crashes.</p> <pre><code>Cursor cursorData = myDataBase.query(CSSTPipeSizingActivity.DB_TABLE, null, CSSTPipeSizingActivity.spinnerPipeLengthText, null, null, null, null, null); </code></pre> <p>Here is my complete <code>getData</code> method:</p> <pre><code>public Cursor getData() { Cursor cursorData = myDataBase.query(CSSTPipeSizingActivity.DB_TABLE, null, CSSTPipeSizingActivity.spinnerPipeLengthText, null, null, null, null, null); if (cursorData != null) cursorData.moveToFirst(); cursorData.moveToFirst(); CSSTPipeSizingActivity.textViewSize15.setText(cursorData.getString(1)); cursorData.moveToNext(); CSSTPipeSizingActivity.textViewSize19.setText(cursorData.getString(1)); cursorData.moveToFirst(); CSSTPipeSizingActivity.textViewSize25.setText(cursorData.getString(1)); cursorData.moveToNext(); CSSTPipeSizingActivity.textViewSize31.setText(cursorData.getString(1)); cursorData.moveToFirst(); CSSTPipeSizingActivity.textViewSize37.setText(cursorData.getString(1)); cursorData.moveToNext(); CSSTPipeSizingActivity.textViewSize46.setText(cursorData.getString(1)); cursorData.moveToNext(); CSSTPipeSizingActivity.textViewSize62.setText(cursorData.getString(1)); cursorData.close(); return cursorData; } // end method getData </code></pre> <p>As you can see from my code, I am trying to take the data and input it straight into text views in the <code>main.xml</code> file. I don't know if this is possible but that will be for me to figure out later. Right now I need to get the data.</p> <p>Here is my logcat:</p> <pre><code>03-12 19:23:33.587: D/AndroidRuntime(20191): Shutting down VM 03-12 19:23:33.587: W/dalvikvm(20191): threadid=1: thread exiting with uncaught exception (group=0x40015560) 03-12 19:23:33.617: E/AndroidRuntime(20191): FATAL EXCEPTION: main 03-12 19:23:33.617: E/AndroidRuntime(20191): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.skyesmechanical.CSSTPipeSizing/com.skyesmechanical.CSSTPipeSizing.CSSTPipeSizingActivity}: java.lang.NullPointerException 03-12 19:23:33.617: E/AndroidRuntime(20191): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 03-12 19:23:33.617: E/AndroidRuntime(20191): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 03-12 19:23:33.617: E/AndroidRuntime(20191): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 03-12 19:23:33.617: E/AndroidRuntime(20191): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 03-12 19:23:33.617: E/AndroidRuntime(20191): at android.os.Handler.dispatchMessage(Handler.java:99) 03-12 19:23:33.617: E/AndroidRuntime(20191): at android.os.Looper.loop(Looper.java:123) 03-12 19:23:33.617: E/AndroidRuntime(20191): at android.app.ActivityThread.main(ActivityThread.java:3683) 03-12 19:23:33.617: E/AndroidRuntime(20191): at java.lang.reflect.Method.invokeNative(Native Method) 03-12 19:23:33.617: E/AndroidRuntime(20191): at java.lang.reflect.Method.invoke(Method.java:507) 03-12 19:23:33.617: E/AndroidRuntime(20191): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 03-12 19:23:33.617: E/AndroidRuntime(20191): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 03-12 19:23:33.617: E/AndroidRuntime(20191): at dalvik.system.NativeStart.main(Native Method) 03-12 19:23:33.617: E/AndroidRuntime(20191): Caused by: java.lang.NullPointerException 03-12 19:23:33.617: E/AndroidRuntime(20191): at com.skyesmechanical.CSSTPipeSizing.DataBaseHelper.getData(DataBaseHelper.java:173) 03-12 19:23:33.617: E/AndroidRuntime(20191): at com.skyesmechanical.CSSTPipeSizing.CSSTPipeSizingActivity.onCreate(CSSTPipeSizingActivity.java:105) 03-12 19:23:33.617: E/AndroidRuntime(20191): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 03-12 19:23:33.617: E/AndroidRuntime(20191): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 03-12 19:23:33.617: E/AndroidRuntime(20191): ... 11 more </code></pre> <p>Thanks for your help!</p>
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