Question

我是java的新手，我想知道如何点击同一页面上的多个按钮而不关闭app力。我试图让代码更简单。现在，第一个按钮工作正常但第二个按钮会在点击时强制关闭应用程序对不起，如果我不够清楚解释我的问题我愿意接受任何建议

public static enum CONN_TYPE {
    LEJOS_PACKET, LEGO_LCP
}
class UIMessageHandler extends Handler {
    @Override
    public void handleMessage(Message msg) {

        switch (msg.what) {
            case MESSAGE:
                _message.setText((String) msg.getData().get(MESSAGE_CONTENT));

                break;

            case TOAST:
                showToast((String) msg.getData().get(MESSAGE_CONTENT));
                break;
        }

        _message.setVisibility(View.VISIBLE);
        _message.requestLayout();

    }

}
    public static final String MESSAGE_CONTENT = "String_message";
    public static final int MESSAGE = 1000;
    public static final int TOAST = 2000;
    private BTSend Right;

    private TachoCount tachoCount;

    private Toast reusableToast;

    private TextView _message;

    //static final String START_MESSAGE = "Please make sure you NXT is on and both it and your Android handset have bluetooth enabled";
    private static final String GO_AHEAD = "Choose one!";

    public static UIMessageHandler mUIMessageHandler;

    private final static String TAG = "LeJOSDroid";

    public static NXTConnector connect(final CONN_TYPE connection_type) {
        Log.d(TAG, " about to add LEJOS listener ");

        NXTConnector conn = new NXTConnector();
        conn.setDebug(true);
        conn.addLogListener(new NXTCommLogListener() {

            public void logEvent(String arg0) {
                Log.e(TAG + " NXJ log:", arg0);
            }

            public void logEvent(Throwable arg0) {
                Log.e(TAG + " NXJ log:", arg0.getMessage(), arg0);
            }
        });

        switch (connection_type) {
            case LEGO_LCP:
                conn.connectTo("btspp://NXT", NXTComm.LCP);
                break;
            case LEJOS_PACKET:
                conn.connectTo("btspp://");
                break;
        }

        return conn;

    }

    public static void displayToastOnUIThread(String message) {
        Message message_holder = formMessage(message);
        message_holder.what = LeJOSDroid.TOAST;
        mUIMessageHandler.sendMessage(message_holder);
    }

    private static Message formMessage(String message) {
        Bundle b = new Bundle();
        b.putString(LeJOSDroid.MESSAGE_CONTENT, message);
        Message message_holder = new Message();
        message_holder.setData(b);
        return message_holder;
    }

    public static void sendMessageToUIThread(String message) {
        Message message_holder = formMessage(message);
        message_holder.what = LeJOSDroid.MESSAGE;
        mUIMessageHandler.sendMessage(message_holder);
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        mUIMessageHandler = new UIMessageHandler();
        setContentView(R.layout.main);
        _message = (TextView) findViewById(R.id.messageText);
        seupNXJCache();
        setupTachoCount(this);
        setupRight(this);
        setupBackward(this);
        reusableToast = Toast.makeText(this, "", Toast.LENGTH_SHORT);
    }

    @Override
    protected void onPause() {
        super.onPause();

        if (Right != null) {
            Log.d(TAG, "onPause() closing btSend ");
            Right.closeConnection();
            Right = null;
        }

        if (tachoCount != null) {
            Log.d(TAG, "onPause() closing btSend ");
            tachoCount.closeConnection();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
    }


    public void onCreate1 (Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button button3 = (Button) findViewById(R.id.button3);
        Button button1 = (Button) findViewById(R.id.button1);
        Button button2 = (Button) findViewById(R.id.button2);

        button2.setOnClickListener(new View.OnClickListener(){

            public void onClick(View arg0) {

                switch(arg0.getId()){
                case R.id.button2:
                    try {
                        tachoCount = new TachoCount();
                        _message.setVisibility(View.INVISIBLE);
                        tachoCount.start();
                    } catch (Exception e) {
                        Log.e(TAG, "failed to run BTSend:" + e.getMessage(), e);
                    }
                    break;
        }
            }
        });


        button3.setOnClickListener(new View.OnClickListener() {

            public void onClick(View arg0) {
                switch(arg0.getId()){
            case R.id.button3:
                try {
                    tachoCount = new TachoCount();
                    _message.setVisibility(View.INVISIBLE);
                    tachoCount.start();
                } catch (Exception e) {
                    Log.e(TAG, "failed to run TachoCount:" + e.getMessage(), e);
                }
                break;
                }
            }
        });


        button1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View arg0) {
                switch(arg0.getId()){

            case R.id.button1:
                try {
                    tachoCount = new TachoCount();
                    _message.setVisibility(View.INVISIBLE);
                    tachoCount.start();
                } catch (Exception e) {
                    Log.e(TAG, "failed to run TachoCount:" + e.getMessage(), e);
                }
                break;
            }

            }

        });
    }




    private void seupNXJCache() {

        File root = Environment.getExternalStorageDirectory();

        try {
            String androidCacheFile = "nxj.cache";
            File mLeJOS_dir = new File(root + "/leJOS");
            if (!mLeJOS_dir.exists()) {
                mLeJOS_dir.mkdir();

            }
            File mCacheFile = new File(root + "/leJOS/", androidCacheFile);

            if (root.canWrite() && !mCacheFile.exists()) {
                FileWriter gpxwriter = new FileWriter(mCacheFile);
                BufferedWriter out = new BufferedWriter(gpxwriter);
                out.write("");
                out.flush();
                out.close();
                _message.setText("nxj.cache (record of connection addresses) written to: " + mCacheFile.getName() + GO_AHEAD);
            } else {
                _message.setText("nxj.cache file not written as"
                        + (!root.canWrite() ? mCacheFile.getName() + " can't be written to sdcard." : " cache already exists.") + GO_AHEAD);

            }
        } catch (IOException e) {
            Log.e(TAG, "Could not write nxj.cache " + e.getMessage(), e);
        }
        _message.setVisibility(View.VISIBLE);
        _message.requestLayout();
    }

    private void showToast(String textToShow) {
        reusableToast.setText(textToShow);
        reusableToast.show();
    }

}

Answer 1

您可以在按钮视图中使用this方法，手动点击它。

View.performClick();

您可以对其他按钮执行相同操作，一起单击它们。

很难说，为什么你的应用程序正在关闭，查看你的代码。我注意到的是，你在所有3个按钮clickMethods中做同样的工作。在你正在做的所有3个按钮中：

tachoCount = new TachoCount();
_message.setVisibility(View.INVISIBLE);
tachoCount.start();

另外，我从你的代码中看到，你只能在一个侦听器上使用一个按钮，将所有你的侦听器代码组合在一起。

View.OnClickListener buttonListener = new View.OnClickListener() {
        public void onClick(View arg0) {
            switch(arg0.getId()){

        case R.id.button1:
            try {
                tachoCount = new TachoCount();
                _message.setVisibility(View.INVISIBLE);
                tachoCount.start();
            } catch (Exception e) {
                Log.e(TAG, "failed to run TachoCount:" + e.getMessage(), e);
            }
            break;
        case R.id.button3:
            try {
                tachoCount = new TachoCount();
                _message.setVisibility(View.INVISIBLE);
                tachoCount.start();
            } catch (Exception e) {
                Log.e(TAG, "failed to run TachoCount:" + e.getMessage(), e);
            }
            break;
        case R.id.button2:
                try {
                    tachoCount = new TachoCount();
                    _message.setVisibility(View.INVISIBLE);
                    tachoCount.start();
                } catch (Exception e) {
                    Log.e(TAG, "failed to run BTSend:" + e.getMessage(), e);
                }
                break;
        }

   }

以后

button2.setOnClickListener(buttonListener);

Answer 2

检查日志文件是否与内存有关，可以增加堆内存Increase Heap Memory

单击多个按钮强制关闭java

2 个答案: