Java 将数据从活动A传递到B:应用程序意外停止

1.我试图将一个字符串数组从一个活动传递到另一个活动，但应用程序意外停止。我是android新手，不知道如何操作

2.你能告诉我如何处理这些运行时错误以及如何使用logcat吗？我没有 想法

代码活动A：

private OnClickListener mylistener=new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        intent=new Intent(MsgSmsActivity.this,MsgSmsActivity2.class);
        MsgSmsActivity.this.startActivity(intent);
        intent.putExtra("bodyText", body);
        intent.putExtra("numbersText", number);

    }
};

代码活动B：

String[] arr;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // TODO Auto-generated method stub
    arr=new String[3];
    arr=getIntent().getExtras().getStringArray("bodyText");
    TextView tx=new TextView(this);
    tx.setText(arr[0]);
    setContentView(tx); 
}

正文和数字是字符串数组

这是我的日志：

03-21 13:07:03.477: ERROR/Zygote(32): setreuid() failed. errno: 2<br>
03-21 13:07:14.976: ERROR/Zygote(32): setreuid() failed. errno: 17<br>
03-21 13:07:17.116: ERROR/BatteryService(76): usbOnlinePath not found<br>
03-21 13:07:17.116: ERROR/BatteryService(76): batteryVoltagePath not found<br>
03-21 13:07:17.116: ERROR/BatteryService(76): batteryTemperaturePath not found<br>
03-21 13:07:17.156: ERROR/SurfaceFlinger(76): Couldn't open /sys/power/wait_for_fb_sleep or /sys/power/wait_for_fb_wake<br>
03-21 13:07:17.386: ERROR/SensorService(76): couldn't open device for module sensors (Invalid argument)<br>
03-21 13:07:43.016: ERROR/System(76): Failure starting core service<br>
03-21 13:07:43.016: ERROR/System(76): java.lang.SecurityException<br>
03-21 13:07:43.016: ERROR/System(76):     at android.os.BinderProxy.transact(Native Method)<br>
03-21 13:07:43.016: ERROR/System(76):     at android.os.ServiceManagerProxy.addService(ServiceManagerNative.java:146)<br>
03-21 13:07:43.016: ERROR/System(76):     at android.os.ServiceManager.addService(ServiceManager.java:72)<br>
03-21 13:07:43.016: ERROR/System(76):     at com.android.server.ServerThread.run(SystemServer.java:206)<br>
03-21 13:07:43.056: ERROR/EventHub(76): could not get driver version for /dev/input/mouse0, Not a typewriter<br>
03-21 13:07:43.056: ERROR/EventHub(76): could not get driver version for /dev/input/mice, Not a typewriter<br>
03-21 13:07:43.756: ERROR/SoundPool(76): error loading /system/media/audio/ui/Effect_Tick.ogg<br>
03-21 13:07:43.766: ERROR/SoundPool(76): error loading /system/media/audio/ui/KeypressStandard.ogg<br>
03-21 13:07:43.766: ERROR/SoundPool(76): error loading /system/media/audio/ui/KeypressSpacebar.ogg<br>
03-21 13:07:43.766: ERROR/SoundPool(76): error loading /system/media/audio/ui/KeypressDelete.ogg<br>
03-21 13:07:43.776: ERROR/SoundPool(76): error loading /system/media/audio/ui/KeypressReturn.ogg<br>
03-21 13:07:43.806: ERROR/UsbObserver(76): java.lang.NullPointerException<br>
03-21 13:07:43.806: ERROR/UsbObserver(76):     at com.android.server.UsbObserver.init(UsbObserver.java:131)<br>
03-21 13:07:43.806: ERROR/UsbObserver(76):     at com.android.server.UsbObserver.<init>(UsbObserver.java:65)<br>
03-21 13:07:43.806: ERROR/UsbObserver(76):     at com.android.server.ServerThread.run(SystemServer.java:402)<br>
03-21 13:07:48.077: ERROR/ThrottleService(76): Could not open GPS configuration file /etc/gps.conf<br>
03-21 13:07:48.128: ERROR/ThrottleService(76): Error reading data file<br>
03-21 13:07:48.606: ERROR/logwrapper(172): executing /system/bin/tc failed: No such file or directory<br>
03-21 13:07:48.687: ERROR/logwrapper(174): executing /system/bin/tc failed: No such file or directory<br>
03-21 13:07:48.756: ERROR/logwrapper(177): executing /system/bin/tc failed: No such file or directory<br>
03-21 13:07:54.707: ERROR/logwrapper(213): executing /system/bin/tc failed: No such file or directory<br>
03-21 13:07:54.737: ERROR/logwrapper(214): executing /system/bin/tc failed: No such file or directory<br>
03-21 13:07:54.767: ERROR/logwrapper(215): executing /system/bin/tc failed: No such file or directory<br>
03-21 18:08:58.619: ERROR/MetadataRetrieverClient(33): failed to extract an album art<br>
03-21 18:09:17.207: ERROR/ThrottleService(76): Error reading data file<br>
03-21 18:25:23.387: ERROR/InputDispatcher(76): channel '40517da8 com.example.ssms/com.example.ssms.MsgSmsActivity (server)' ~ Consumer closed input channel or an error occurred.  events=0x8<br>
03-21 18:25:23.387: ERROR/InputDispatcher(76): channel '40517da8 com.example.ssms/com.example.ssms.MsgSmsActivity (server)' ~ Channel is unrecoverably broken and will be disposed!<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439): FATAL EXCEPTION: main<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.ssms/com.example.ssms.MsgSmsActivity2}: java.lang.NullPointerException<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1622)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at android.os.Handler.dispatchMessage(Handler.java:99)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at android.os.Looper.loop(Looper.java:123)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at android.app.ActivityThread.main(ActivityThread.java:3647)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at java.lang.reflect.Method.invokeNative(Native Method)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at java.lang.reflect.Method.invoke(Method.java:507)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at dalvik.system.NativeStart.main(Native Method)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439): Caused by: java.lang.NullPointerException<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at com.example.ssms.MsgSmsActivity2.onCreate(MsgSmsActivity2.java:23)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1586)<br>
03-21 18:25:31.837: ERROR/AndroidRuntime(439):     ... 11 more

尝试使用startActivity切换额外的行

arr是字符串数组。tx.setTextarr；将给出异常，因为setText被定义为接受CharSequence

如果要在TextView上设置一些文本，请首先使用arr[index]从数组中获取字符串，然后将该字符串设置为TextView。

不要在活动A中使用putExtra，请尝试将正文和数字设置为ArrayList，并使用putStringArrayListExtra，然后在活动B中使用getStringArrayListExtra而不是getExtra。发送字符串数据

正如我们已经知道的，我们可以通过意图从一种活动转移到另一种活动

Intent i = new Intent(MainActivity.this,GoActivity.class);

String data = “bla bla”;// Data String to send

i.putExtra("DATA",data );

接收数据

我们可以接收上面的字符串数据，如下所示

Intent i = getIntent();

String data = i.getStringExtra("DATA");// you well get the String data i.e., BLA BLA

发送和接收数据时，红色数据应相同

发送对象

下面是将对象从一个类发送到另一个类的代码。发送对象的一件重要事情是类应该实现可序列化类

下面的红色文本应相同

Intent i = new Intent(MainActivity.this,startActivity.class);

ObjectClassName object = new ObjectClassName();

i.putExtra("THIS", Object);

接收对象

//startActivity.java

Intent i = getIntent();

ObjectClassName obj = (ObjectClassName) getIntent().getSerializableExtra("THIS");// TypeCasting needed 

---

thnx@blackbelt的回复。我照你说的做了，但结果是一样的：sry这是一个有问题的错误，它是arr[0]，但结果是一样的。@MJ192使用Sysout检查arr是否有值？是的，问题是arr中没有任何值。在manifest.xml中检查是否存在MsgSmsActivity2

Intent i = getIntent();

ObjectClassName obj = (ObjectClassName) getIntent().getSerializableExtra("THIS");// TypeCasting needed