Question

我有两个包说com.android.package1和com.android.package2
package1中的活动（比如说A）想要在package2中启动一个活动（比如说B）为此，我使用了以下方法

Intent to_start_B = new Intent(A.this,com.android.Package2.B.class);
startActivity(to_start_B);

这适用于其他活动，除此之外（所以没有清单和通话问题）!!

此特定活动B的代码是

public class B extends Activity {
private Logger logger = Logger.getMyLogger(this.getClass().getName());

private MicroRuntimeServiceBinder microRuntimeServiceBinder;
private ServiceConnection serviceConnection;

static final int CHAT_REQUEST = 0;
static final int SETTINGS_REQUEST = 1;

private MyReceiver myReceiver;
private MyHandler myHandler;

private TextView infoTextView;
private static String nickname="";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    myReceiver = new MyReceiver();

    IntentFilter killFilter = new IntentFilter();
    killFilter.addAction("jade.demo.chat.KILL");
    registerReceiver(myReceiver, killFilter);

    IntentFilter showChatFilter = new IntentFilter();
    showChatFilter.addAction("jade.demo.chat.SHOW_CHAT");
    registerReceiver(myReceiver, showChatFilter);

    myHandler = new MyHandler();
    nickname = "Ganesh";//getIntent().getExtras().getString("uname");

    setContentView(R.layout.chat_main);
    Button button = (Button) findViewById(R.id.btn_chatroom);
    button.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (!checkName(nickname)) {
                logger.info("Invalid nickname!");
                myHandler.postError(getString(R.string.msg_nickname_not_valid));
            } else {
                try {
                    SharedPreferences settings = getSharedPreferences(
                            "jadeChatPrefsFile", 0);
                    String host = settings.getString("defaultHost", "");
                    String port = settings.getString("defaultPort", "");
                    infoTextView.setText(getString(R.string.msg_connecting_to)
                            + " " + host + ":" + port + "...");
                    startChat(nickname, host, port, agentStartupCallback);
                } catch (Exception ex) {
                    logger.severe("Unexpected exception creating chat agent!");
                    infoTextView.setText(getString(R.string.msg_unexpected));
                }
            }

        }
    });     
    infoTextView = (TextView) findViewById(R.id.infoTextView);
    infoTextView.setText("");

}

我以下列方式收到错误

03-07 11:36:25.399: W/dalvikvm(8493): threadid=1: thread exiting with uncaught exception (group=0x40015560)
03-07 11:36:25.409: E/AndroidRuntime(8493): FATAL EXCEPTION: main
03-07 11:36:25.409: E/AndroidRuntime(8493): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.home/chat.client.gui.MainActivity}: java.lang.NullPointerException
03-07 11:36:25.409: E/AndroidRuntime(8493):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at android.os.Looper.loop(Looper.java:123)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at android.app.ActivityThread.main(ActivityThread.java:3683)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at java.lang.reflect.Method.invokeNative(Native Method)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at java.lang.reflect.Method.invoke(Method.java:507)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-07 11:36:25.409: E/AndroidRuntime(8493):     at dalvik.system.NativeStart.main(Native Method)
03-07 11:36:25.409: E/AndroidRuntime(8493): Caused by: java.lang.NullPointerException
03-07 11:36:25.409: E/AndroidRuntime(8493):     at chat.client.gui.MainActivity.onCreate(MainActivity.java:96)
 03-07 11:36:25.409: E/AndroidRuntime(8493):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
 03-07 11:36:25.409: E/AndroidRuntime(8493):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
03-07 11:36:25.409: E/AndroidRuntime(8493):     ... 11 more

所以基本上它的问题只与那个特定的活动B有关。但如果它作为另一个应用程序的一部分执行它可以正常工作！

任何人都可以让我知道如何摆脱这个问题吗？

Answer 1

嘿找到了我的问题的解决方案

在整合来自不同项目的两个软件包时，我从src和gen文件夹（以及布局）中拖拽和下载了软件包。
所以我有两份R文件。但是pakage2.R文件无效，因为一个新的R文件是自动为Package1中的每个组件使用新的R.id生成的（在gen文件夹中）所以解决方案是

从gen文件夹中删除Package2。
导入Package1.R文件的Package2

在android中集成两个包

1 个答案: