Question

我正在开发一个应用程序，其中我有一个特定按钮的OnClickListener。当我按下按钮时，应该执行某种方法。当我在onCreate块中编写onclicklistener时，一切正常。当我使用自定义OnClickListener在oncreate方法之外定义操作时，如果我点击Button，我的应用程序会崩溃！

以下是 inLine Version：

的代码

public class OrcStopWatchActivity extends Activity {
    public String[] names;
    public String[][] gphArray;
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_orc_stop_watch);
        //set up the tabhost
        TabHost th = (TabHost) findViewById (R.id.tabhost);
        th.setup();
        TabSpec specs = th.newTabSpec("tag1");
        specs.setContent(R.id.tab1);
        specs.setIndicator("Start");
        th.addTab(specs);
        specs = th.newTabSpec("tag2");
        specs.setContent(R.id.tab2);
        specs.setIndicator("Race");
        th.addTab(specs);
        specs = th.newTabSpec("tag3");
        specs.setContent(R.id.tab3);
        specs.setIndicator("Results");
        th.addTab(specs);


        stopBoat5Button = (Button)findViewById(R.id.btnStopBoat5);
        textResult = (TextView)findViewById(R.id.textResult);

                ////////////////////////////////////////////////////////////////////////////////////////////////
        String[][] gesamtArray = SvenMethods.makeArray(werteRow.txt);

        //erstelle Vektor names
        names = SvenMethods.extractColumn(gesamtArray,0);
        //  displayStringArray(names);

        //erstelle Array mit den gph Werten als double Werte ohne Namen
        gphArray = SvenMethods.deleteColumn(gesamtArray, 0);
        //  display2dStringArray(gphArray);

        //on click action of the stop buttons 
        stopBoat5Button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0){

                stopBoat5Button.setEnabled(false);
                    String resultString=SvenMethods.calcCorrectedTimesTest(names, gphArray);
                    Toast.makeText(getApplicationContext(), "this is my Toast message!!! =)",
                            Toast.LENGTH_LONG).show();
                                    textResult.setText(resultString);

            }
        }
                );

    }
}

这个工作正常，只有我通过使用自定义侦听器更改它才会崩溃。使用自定义侦听器更改代码的代码如下：

  .....

stopBoat5Button.setOnClickListener(mStopListener5);
}

    OnClickListener mStopListener5 = new OnClickListener() {
    @Override
    public void onClick(final View arg0) {

            String resultString=SvenMethods.calcCorrectedTimesTest(names, gphArray);
            Toast.makeText(getApplicationContext(), "this is my Toast message!!! =)",
                    Toast.LENGTH_LONG).show();
                            textResult.setText(resultString);

    }
};

我希望问题的描述有点可以理解......我觉得这与传递两个变量名称和gphArray有关...但我不明白为什么两者之间存在差异使用onClickListener的方法。

logcat的：

01-28 11:22:38.229: D/TextLayoutCache(7668): Using debug level: 0 - Debug Enabled: 0
01-28 11:22:38.279: D/libEGL(7668): loaded /system/lib/egl/libGLES_android.so
01-28 11:22:38.289: D/libEGL(7668): loaded /system/lib/egl/libEGL_adreno200.so
01-28 11:22:38.309: D/libEGL(7668): loaded /system/lib/egl/libGLESv1_CM_adreno200.so
01-28 11:22:38.309: D/libEGL(7668): loaded /system/lib/egl/libGLESv2_adreno200.so
01-28 11:22:38.399: D/OpenGLRenderer(7668): Enabling debug mode 0
01-28 11:22:38.469: D/dalvikvm(7668): GC_CONCURRENT freed 198K, 4% free 6648K/6919K, paused 4ms+4ms
01-28 11:22:46.770: D/AndroidRuntime(7668): Shutting down VM
01-28 11:22:46.770: W/dalvikvm(7668): threadid=1: thread exiting with uncaught exception (group=0x2b542210)
01-28 11:22:46.779: E/AndroidRuntime(7668): FATAL EXCEPTION: main
01-28 11:22:46.779: E/AndroidRuntime(7668): java.lang.NullPointerException
01-28 11:22:46.779: E/AndroidRuntime(7668):     at methods.SvenMethods.extractColumn(SvenMethods.java:442)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at methods.SvenMethods.lowestValue(SvenMethods.java:355)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at methods.SvenMethods.calcCorrectedTimesTest(SvenMethods.java:32)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at com.orcCalculation.OrcStopWatchActivity$7.onClick(OrcStopWatchActivity.java:328)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at android.view.View.performClick(View.java:3534)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at android.view.View$PerformClick.run(View.java:14263)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at android.os.Handler.handleCallback(Handler.java:605)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at android.os.Looper.loop(Looper.java:137)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at android.app.ActivityThread.main(ActivityThread.java:4441)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at java.lang.reflect.Method.invokeNative(Native Method)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at java.lang.reflect.Method.invoke(Method.java:511)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-28 11:22:46.779: E/AndroidRuntime(7668):     at dalvik.system.NativeStart.main(Native Method)

提前感谢您的帮助！干杯，斯文

Answer 1

这里有几个选项，但这可能是最简单的，应该可行：

View.OnClickListener mStopListener5 = new View.OnClickListener() {

     @Override
     public void onClick(final View arg0) {

        String resultString=SvenMethods.calcCorrectedTimesTest(names, gphArray);
        Toast.makeText(getApplicationContext(), "this is my Toast message!!! =)",
                Toast.LENGTH_LONG).show();
                        textResult.setText(resultString);

     }

}

自定义OnClickListener与inLine OnClickListener的问题

1 个答案: