訪問黃色LED

Question

我不知道如何打開這個DigitalOutput。錯誤在第31行 - >led = ioio.openDigitalOutput(IOIO.LED_PIN);這是什麼問題？

import ioio.lib.api.DigitalOutput; 
import ioio.lib.api.IOIO; 
import ioio.lib.api.IOIOFactory; 
import ioio.lib.api.exception.ConnectionLostException; 
import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 
import android.widget.TextView; 

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     TextView text = (TextView) findViewById(R.id.textView1); 
     text.setText("---"); 
     IOIO ioio = null; 


     try{ 
      ioio = IOIOFactory.create(); 
     } catch(Exception e) { 
      text.setText(e.toString()); 
     } 

     DigitalOutput led = null; 
     try { 
      led = ioio.openDigitalOutput(IOIO.LED_PIN); 
      led.write(true); 
     } catch (ConnectionLostException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     try { 
      led.write(true); 
     } catch (ConnectionLostException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.activity_main, menu); 
     return true; 
    } 

} 

的logcat：

07-29 16:14:03.027: E/AndroidRuntime(18831): FATAL EXCEPTION: main 
07-29 16:14:03.027: E/AndroidRuntime(18831): java.lang.RuntimeException: Unable to start activity ComponentInfo{net.ho.simon.testioio/net.ho.simon.testioio.MainActivity}: java.lang.IllegalStateException: Connection has not yet been established 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.app.ActivityThread.access$600(ActivityThread.java:141) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.os.Looper.loop(Looper.java:137) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.app.ActivityThread.main(ActivityThread.java:5041) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at java.lang.reflect.Method.invokeNative(Native Method) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at java.lang.reflect.Method.invoke(Method.java:511) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at dalvik.system.NativeStart.main(Native Method) 
07-29 16:14:03.027: E/AndroidRuntime(18831): Caused by: java.lang.IllegalStateException: Connection has not yet been established 
07-29 16:14:03.027: E/AndroidRuntime(18831): at ioio.lib.impl.IOIOImpl.checkState(IOIOImpl.java:650) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at ioio.lib.impl.IOIOImpl.openDigitalOutput(IOIOImpl.java:332) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at ioio.lib.impl.IOIOImpl.openDigitalOutput(IOIOImpl.java:356) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at net.ho.simon.testioio.MainActivity.onCreate(MainActivity.java:31) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.app.Activity.performCreate(Activity.java:5104) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
07-29 16:14:03.027: E/AndroidRuntime(18831): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
07-29 16:14:03.027: E/AndroidRuntime(18831): ... 11 more 

Answer 1

你錯過了一些東西，導致顯示

java.lang.IllegalStateException：連接尚未建立

你這麼忙你不是在等待連接:)

try { 
     ioio.waitForConnect(); //Note this line 
     //You Code Goes Here 
    } catch (ConnectionLostException e) { 

    } catch (IncompatibilityException e) { 

    }