我如何从glView设置从子类

Question

我有一个加载两个类成的FrameLayout视图中的主要活动标题栏的文本..

//Create Intance of Camera 
     camPreview = new CamLayer(this.getApplicationContext()); 

     //Create Instance of OpenGL 
     glView = new GLLayer(this); 

     //FrameLayOut for holding everything 
     FrameLayout frame = new FrameLayout(this); 
     // set as main view 
     setContentView(frame); 

     // add Camera to view 
     frame.addView(camPreview, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 

     frame.addView(glView); 

启动我的传感器管理器，称为PhoneOrientation像这样：

public GLLayer(Context context) { 
    super(context); 

    this.context = context; 
    this.square = new Square(); 
    phoneOri=new PhoneOrientation(context); // sensor manager and interpreter 

    // settings for translucent glView 
    this.setEGLConfigChooser(8, 8, 8, 8, 16, 0); 
    this.getHolder().setFormat(PixelFormat.TRANSLUCENT); 

    // set render to inline 
    this.setRenderer(this); 
    phoneOri.start(context); 

} 

我phoneOrientation类：

public class PhoneOrientation { 
private SensorManager sensorMan; 
private Sensor sensorAcce; 
private Sensor sensorMagn; 
private SensorEventListener listener; 
private float matrix[]=new float[16]; 
private Context ctx; 

public PhoneOrientation(Context context) { 
    ctx = context; 
} 

public void start(Context context) { 
    listener = new SensorEventListener() { 
     private float orientation[]=new float[3]; 
     private float acceleration[]=new float[3]; 

     public void onAccuracyChanged(Sensor arg0, int arg1){} 

     public void onSensorChanged(SensorEvent evt) { 
      int type=evt.sensor.getType(); 

      //Smoothing the sensor data a bit seems like a good idea. 
      if (type == Sensor.TYPE_MAGNETIC_FIELD) { 
       orientation[0]=(orientation[0]*1+evt.values[0])*0.5f; 
       orientation[1]=(orientation[1]*1+evt.values[1])*0.5f; 
       orientation[2]=(orientation[2]*1+evt.values[2])*0.5f; 
      } else if (type == Sensor.TYPE_ACCELEROMETER) { 
       acceleration[0]=(acceleration[0]*2+evt.values[0])*0.33334f; 
       acceleration[1]=(acceleration[1]*2+evt.values[1])*0.33334f; 
       acceleration[2]=(acceleration[2]*2+evt.values[2])*0.33334f; 
      } 
      if ((type==Sensor.TYPE_MAGNETIC_FIELD) || (type==Sensor.TYPE_ACCELEROMETER)) { 
       float newMat[]=new float[16]; 
       //Toast toast = Toast.makeText(ctx.getApplicationContext(), "accel", Toast.LENGTH_SHORT); 
       //toast.show(); 
       SensorManager.getRotationMatrix(newMat, null, acceleration, orientation); 
       SensorManager.remapCoordinateSystem(newMat, 
         SensorManager.AXIS_Y, SensorManager.AXIS_MINUS_X, 
         newMat); 
       matrix=newMat; 
      } 
     } 
    }; 

    sensorMan = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE); 
    sensorAcce = sensorMan.getSensorList(Sensor.TYPE_ACCELEROMETER).get(0); 
    sensorMagn = sensorMan.getSensorList(Sensor.TYPE_MAGNETIC_FIELD).get(0); 

    sensorMan.registerListener(listener, sensorAcce, SensorManager.SENSOR_DELAY_FASTEST); 
    sensorMan.registerListener(listener, sensorMagn, SensorManager.SENSOR_DELAY_FASTEST);  
} 

public float[] getMatrix() { 
    return matrix; 
} 

public void finish() { 
    sensorMan.unregisterListener(listener); 
} 

}

我的phoniOrientationClass实质上是我的传感器管理器，从那里我想将一些传感器数据吐出到我的应用程序的标题栏中，即。

context.setTitle("x: "+ xData); // or something? 

它似乎并不像我可以从那里打这个电话？我是java新手，我看到很多人在tutorials/examples中嵌入他们的类。我个人不喜欢这么做，因为我认为这会让代码变得糟糕。但我认为，因为我将我的应用程序上下文从我的主要活动传递到了我的glView，然后再次传递给我的传感器管理器，我可以进行此调用？有人可以向我解释我可以吗？

EL

Answer 1

“大红线”下方法意思是：“该方法的setTitle（字符串）是未定义的类型上下文”。幸运的是，这可以通过将上下文转换为Activity来很快修复。

Activity activity = (Activity) context; 
activity.setTitle("x: "+ xData);