我試圖創建一個簡單的高/低應用程序,但應用程序崩潰時,我嘗試獲得一個隨機數。 下面是一些代碼:隨機數字1-6
final TextView counter = (TextView) findViewById(R.id.tcounter);
Button high = (Button) findViewById(R.id.bhigh);
Button low = (Button) findViewById(R.id.blow);
Button start = (Button) findViewById(R.id.bplay);
final Random rstart = new Random();
final int counternr = rstart.nextInt(5) + 1;
start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
counter.setText(counternr);
是應該設置TextView的「櫃檯」,以1-6的隨機數,但讓我崩潰。
在此先感謝!
編輯:這是錯誤的文字:
11-23 20:17:40.509: ERROR/AndroidRuntime(765): FATAL EXCEPTION: main
11-23 20:17:40.509: ERROR/AndroidRuntime(765): java.lang.RuntimeException: Unable to start activity ComponentInfo{xxx.xxx.xxx/xxx.xxx.xxx.play}: java.lang.NullPointerException
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at android.os.Handler.dispatchMessage(Handler.java:99)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at android.os.Looper.loop(Looper.java:123)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at android.app.ActivityThread.main(ActivityThread.java:3683)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at java.lang.reflect.Method.invokeNative(Native Method)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at java.lang.reflect.Method.invoke(Method.java:507)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at dalvik.system.NativeStart.main(Native Method)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): Caused by: java.lang.NullPointerException
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at xxx.xxx.xxx.play.onCreate(play.java:26)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
11-23 20:17:40.509: ERROR/AndroidRuntime(765): ... 11 more
很凌亂,但我希望這是確定。
發佈堆棧跟蹤或日誌的副本,顯示崩潰發生的位置以及拋出的異常。 – Grambot
「NullPointerException」在「xxx.xxx.xxx.play.onCreate」 – Edalol