如何执行特定秒的功能

Question

所以基本上，我想从蓝牙流式数据，但开关模式。每个在&关闭模式下发生一段特定的时间，即5秒。 所以， 我需要把一个函数执行5秒，然后在按钮单击方法内执行另一个函数。但我的代码不能正常工作。

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

     setContentView(R.layout.activity_main); 

     btnOn = (Button) findViewById(R.id.btnOn);     // button LED ON 
     btnOff = (Button) findViewById(R.id.btnOff);    // button LED OFF 
     btnStart = (Button) findViewById(R.id.btnStart); 
     txtArduino = (TextView) findViewById(R.id.txtArduino);  // for display the received data from the Arduino 

     h = new Handler() { 
      public void handleMessage(android.os.Message msg) { 
       switch (msg.what) { 
       case RECIEVE_MESSAGE:             // if receive massage 
        byte[] readBuf = (byte[]) msg.obj; 
        String strIncom = new String(readBuf, 0, msg.arg1);     // create string from bytes array 
        sb.append(strIncom);            // append string 
        int endOfLineIndex = sb.indexOf("\r\n");       // determine the end-of-line 
        if (endOfLineIndex > 0) {           // if end-of-line, 
         String sbprint = sb.substring(0, endOfLineIndex);    // extract string 
         sb.delete(0, sb.length());          // and clear 
         txtArduino.setText("Data from Arduino: " + sbprint);   // update TextView 
         btnOff.setEnabled(true); 
         btnOn.setEnabled(true); 
        } 
        //Log.d(TAG, "...String:"+ sb.toString() + "Byte:" + msg.arg1 + "..."); 
        break; 
       } 
      }; 
     }; 

     btAdapter = BluetoothAdapter.getDefaultAdapter();  // get Bluetooth adapter 
     checkBTState(); 

     btnOn.setOnClickListener(new OnClickListener() { 
      public void onClick(View v) { 
      btnOn.setEnabled(false); 
      bluetoothConnect(); 
      } 
     }); 

     btnOff.setOnClickListener(new OnClickListener() { 
      public void onClick(View v) { 
      btnOff.setEnabled(false); 
      bluetoothDisconnect(); 
      } 
     }); 

     btnStart.setOnClickListener(new OnClickListener() { 
       public void onClick(View v) { 
       bluetoothDisconnect(); 
        //Starts from here the code doesn't work 
        //I want to perform these functions over and over 
       while (true){ 
        //I want method executed for 5 seconds here 
        h.postDelayed(new Runnable() { 
         @Override 
         public void run(){ 
          bluetoothConnect(); 
         } 
        }, 5000); 
        //I want method executed for 5 seconds here 
        h.postDelayed(new Runnable() { 
         @Override 
         public void run(){ 
          bluetoothDisconnect(); 
         } 
        }, 5000); 
       } 
       } 
      }); 
     } 

Answer 1

你可以尝试以下方法...

private boolean canExecute; 

private void callYourMethod() { 
    canExecute = true; 
    new Handler().postDelayed(new Runnable() { 

     @Override 
     public void run() { 
      canExecute = false; 
     } 
    }, 5000); 
    yourMethodToExecuteForFiveSeconds(); 
} 

private void yourMethodToExecuteForFiveSeconds() { 
    // Your code goes here 

    if (canExecute) { 
     //This will be true for five seconds only. 
     yourMethodToExecuteForFiveSeconds(); 
    } 
}