如何解決造成錯誤的手勢（由java.lang.NullpointerException引起）？

Question

public class GusterActivity extends Activity implements OnGesturePerformedListener 
{ 
    TextView txtmsg; 
    TextView txtwrt; 
    private GestureLibrary gesturelib; 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    GestureOverlayView gestureoverlayview=new GestureOverlayView(this); 
    View inflate=getLayoutInflater().inflate(R.layout.main,null); 
    gestureoverlayview.addView(inflate); 
    gestureoverlayview.addOnGesturePerformedListener(this); 
    gesturelib= GestureLibraries.fromRawResource(this,R.raw.gestures); 
    if(gesturelib.load()){ 
     finish(); 
    } 
    setContentView(gestureoverlayview); 
} 

public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) { 
    ArrayList<Prediction> predictions = gesturelib.recognize(gesture); 
    for(Prediction prediction : predictions){ 
     if(prediction.score>1.0){ 

       Toast.makeText(this,prediction.name,Toast.LENGTH_SHORT); 



     } 
    } 
} 

Answer 1

可能是你得到空指針，因爲你的gesturelib是行空（gesturelib = GestureLibraries.fromRawResource（這一點，R.raw.gestures）;）