Question

我收到以下错误

05-08 01:03:16.003: D/dalvikvm(1147): GC_FOR_ALLOC freed 46K, 4% free 3036K/3156K, paused 98ms, total 102ms
    05-08 01:03:16.313: D/dalvikvm(1147): GC_FOR_ALLOC freed 3K, 4% free 3386K/3508K, paused 42ms, total 43ms
    05-08 01:03:17.263: D/gralloc_goldfish(1147): Emulator without GPU emulation detected.
    05-08 01:03:21.563: D/dalvikvm(1147): GC_FOR_ALLOC freed 11K, 2% free 3850K/3928K, paused 139ms, total 146ms
    05-08 01:03:21.733: D/dalvikvm(1147): GC_FOR_ALLOC freed 4K, 3% free 3944K/4028K, paused 139ms, total 140ms
    05-08 01:03:21.813: I/dalvikvm-heap(1147): Grow heap (frag case) to 4.990MB for 1127536-byte allocation
    05-08 01:03:22.043: D/dalvikvm(1147): GC_FOR_ALLOC freed <1K, 2% free 5045K/5132K, paused 224ms, total 224ms
    05-08 01:03:23.943: D/AndroidRuntime(1147): Shutting down VM
    05-08 01:03:23.943: W/dalvikvm(1147): threadid=1: thread exiting with uncaught exception (group=0xb1ad3ba8)
    05-08 01:03:24.003: E/AndroidRuntime(1147): FATAL EXCEPTION: main
    05-08 01:03:24.003: E/AndroidRuntime(1147): Process: com.example.crosswordapp, PID: 1147
    05-08 01:03:24.003: E/AndroidRuntime(1147): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.crosswordapp/com.example.crosswordapp.MainActivity}: java.lang.NullPointerException
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.os.Handler.dispatchMessage(Handler.java:102)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.os.Looper.loop(Looper.java:136)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.app.ActivityThread.main(ActivityThread.java:5017)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at java.lang.reflect.Method.invokeNative(Native Method)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at java.lang.reflect.Method.invoke(Method.java:515)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at dalvik.system.NativeStart.main(Native Method)
    05-08 01:03:24.003: E/AndroidRuntime(1147): Caused by: java.lang.NullPointerException
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at com.example.crosswordapp.MainActivity.onCreate(MainActivity.java:139)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.app.Activity.performCreate(Activity.java:5231)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
    05-08 01:03:24.003: E/AndroidRuntime(1147):     ... 11 more
    05-08 01:08:24.593: I/Process(1147): Sending signal. PID: 1147 SIG: 9

这是我的Log-cat

我的MainActivity.java就是这个

String output = "-,-,-,-,-,-,-,-,-,-,-,-,-,;-,a,-,c,g,-,-,-,g,-,-,-,-,;c,s,-,o,a,-,-,-,r,-,-,-,-,;o,s,-,h,t,-,-,-,o,-,-,-,-,;m,e,-,o,h,-,-,-,u,p,-,-,-,;p,m,-,r,e,-,-,-,p,e,-,-,-,;a,b,s,t,r,a,c,t,i,o,n,-,-,;n,l,-,-,i,-,-,-,n,p,-,-,-,;y,a,-,-,n,-,-,-,g,l,-,-,-,;-,g,-,-,g,-,-,-,-,e,-,-,-,;-,e,-,-,-,-,-,-,-,-,-,-,-,;-,-,-,-,-,-,-,-,-,-,-,-,-,;-,-,-,-,-,-,-,-,-,-,-,-,-,;";
        String[][] populate = new String[13][13];

        String[] outputRow = output.split(";");
        // Log.i(outputRow+"output");
        for (int i = 0; i < outputRow.length; i++) {
            String[] outputCol = outputRow[i].split(",");
            for (int j = 0; j < outputCol.length; j++) {

                buttons[i][j] = new TextView(MainActivity.this);

                buttons[i][j].setBackgroundResource(R.drawable.white);
                if (populate[i][j].equalsIgnoreCase("-")) {
                    buttons[i][j].setText(populate[i][j]);
                    buttons[i][j].setBackgroundResource(R.drawable.black);
                    buttons[i][j].setEnabled(false);
                } else {
                    buttons[i][j].setText(populate[i][j]);
                    buttons[i][j].setBackgroundResource(R.drawable.white);
                    buttons[i][j].setEnabled(true);
                }

这里我需要显示我在程序中返回的字符串输出的网格。在这里我没有收到任何错误，但在运行应用程序时它显示：

不幸的是申请已停止。

这里有139行

if（populate [i] [j] .equalsIgnoreCase（＆＃34; - ＆＃34;））

这里显示空指针异常。我不知道它为什么会来。

Answer 1

虽然您已定义String[][] populate = new String[13][13];
我在你的代码中没有看到你填充它的位置这导致populate[i][j]为空，并且您将该异常抛出。
在使用之前尝试将值放在populate [] []中。

Answer 2

您的错误表明您有一个NULL POINTER EXCEPTION，这意味着其中一个字符串没有取任何值并保持为null。因此，当您尝试访问该字符串时，会发生错误。尝试先打印所有字符串，看看哪个字符串存储了哪些数据，也许这样就可以解决错误。

不幸的是申请停止

2 个答案: