令牌“OnClickListener”上的语法错误，=此令牌后的预期值

时间：2014-04-03 06:42:26

标签： android eclipse

我知道另一个主题就是用这种方式调用，但它没有回答我的问题。

Eclipse强调setOnClickListener指向      `loc.setOnClickListener（new View.OnClickListener（） 并说 令牌“setOnClickListener”上的语法错误，=此令牌后的预期值。

我开始练习Android，我认为解决方案非常简单。提前谢谢！

package com.example.vll;

import com.example.vll.R;

import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.lang.Math;

public class MainActivity extends Activity {

private SensorManager mySensorManager;
private Sensor myGravitySensor;
private Sensor  myAccelerometerSensor;

TextView x_position_value;
TextView y_position_value;
TextView z_position_value;
TextView x_normal_vector_value;
TextView y_normal_vector_value;
TextView z_normal_vector_value;
TextView textLightSensor;

private float xPositionValue=0;
private float yPositionValue=0;
private float zPositionValue=0;

private float xAccelerometerValue=0;
private float yAccelerometerValue=0;
private float zAccelerometerValue=0;


private float xGravityValue=0;
private float yGravityValue=0;
private float zGravityValue=0;  

Button loc;


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



     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);

     loc = (Button) findViewById(R.id.localize);

     x_position_value = (TextView) findViewById(R.id.x_position_value);
     y_position_value = (TextView) findViewById(R.id.y_position_value);
     z_position_value = (TextView) findViewById(R.id.z_position_value);

     mySensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
     myGravitySensor = mySensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);
     myAccelerometerSensor = mySensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

           if (myAccelerometerSensor == null){
            textLightSensor.setText("No Accelerometer Sensor!");
           }else{
            //mySensorManager.registerListener(GravitySensorEventListener, myGravitySensor, SensorManager.SENSOR_DELAY_FASTEST);
            mySensorManager.registerListener(AccelerometerSensorEventListener, myAccelerometerSensor, SensorManager.SENSOR_DELAY_FASTEST);
            }
   }

 SensorEventListener AccelerometerSensorEventListener
   = new SensorEventListener(){

    @Override
       public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO Auto-generated method stub
        }

@Override
      public void onSensorChanged(SensorEvent event) {
       // TODO Auto-generated method stub
       if(event.sensor.getType()==Sensor.TYPE_ACCELEROMETER){

           xAccelerometerValue=event.values[0];
           yAccelerometerValue=event.values[1];
           zAccelerometerValue=event.values[2];

       }
     }};

 /*
   SensorEventListener GravitySensorEventListener
    = new SensorEventListener(){

       @Override
       public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO Auto-generated method stub
        }

       @Override
       public void onSensorChanged(SensorEvent event) {
        // TODO Auto-generated method stub
           if(event.sensor.getType()==Sensor.TYPE_GRAVITY){
               xGravityValue=event.values[0];
               yGravityValue=event.values[1];
               zGravityValue=event.values[2];
           }
        }
    };
     */

    //MY PROBLEM IS HERE    
    loc.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            x_normal_vector_value.setText(" x = "+String.valueOf(xAccelerometerValue*Math.pow(Math.pow(Math.pow(xAccelerometerValue,2)+Math.pow(yAccelerometerValue,2)+Math.pow(zAccelerometerValue,2), 0.5), -1)));
            y_normal_vector_value.setText(" y = "+String.valueOf(yAccelerometerValue*Math.pow(Math.pow(Math.pow(xAccelerometerValue,2)+Math.pow(yAccelerometerValue,2)+Math.pow(zAccelerometerValue,2), 0.5), -1)));
            z_normal_vector_value.setText(" z = "+String.valueOf(zAccelerometerValue*Math.pow(Math.pow(Math.pow(xAccelerometerValue,2)+Math.pow(yAccelerometerValue,2)+Math.pow(zAccelerometerValue,2), 0.5), -1)));
        }
    });

}

3 个答案:

答案 0 :(得分：2)

这是一个错位}的案例。正确检查它们并使用IDE不应该那么困难

您需要更改此

mySensorManager.registerListener(AccelerometerSensorEventListener,myAccelerometerSensor, SensorManager.SENSOR_DELAY_FASTEST);
 } // else end here
} // onCreate brace end here.

到

mySensorManager.registerListener(AccelerometerSensorEventListener, myAccelerometerSensor, SensorManager.SENSOR_DELAY_FASTEST);
 } // else end here

最后有支柱} 

   });
  } // oncreate
 } // activity

答案 1 :(得分：1)

您需要确保onClickListener部分位于onCreate方法范围内。

这是正确的代码：

 package com.example.vll;

import com.example.vll.R;

import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.lang.Math;

public class MainActivity extends Activity {

private SensorManager mySensorManager;
private Sensor myGravitySensor;
private Sensor  myAccelerometerSensor;

TextView x_position_value;
TextView y_position_value;
TextView z_position_value;
TextView x_normal_vector_value;
TextView y_normal_vector_value;
TextView z_normal_vector_value;
TextView textLightSensor;

private float xPositionValue=0;
private float yPositionValue=0;
private float zPositionValue=0;

private float xAccelerometerValue=0;
private float yAccelerometerValue=0;
private float zAccelerometerValue=0;


private float xGravityValue=0;
private float yGravityValue=0;
private float zGravityValue=0;


Button loc;


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



     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);

     loc = (Button) findViewById(R.id.localize);

     x_position_value = (TextView) findViewById(R.id.x_position_value);
     y_position_value = (TextView) findViewById(R.id.y_position_value);
     z_position_value = (TextView) findViewById(R.id.z_position_value);

     mySensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
     myGravitySensor = mySensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);
     myAccelerometerSensor = mySensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

           if (myAccelerometerSensor == null){
            textLightSensor.setText("No Accelerometer Sensor!");
           }else{
            //mySensorManager.registerListener(GravitySensorEventListener, myGravitySensor, SensorManager.SENSOR_DELAY_FASTEST);
            mySensorManager.registerListener(AccelerometerSensorEventListener, myAccelerometerSensor, SensorManager.SENSOR_DELAY_FASTEST);
            }

 //MY PROBLEM IS HERE 
    loc.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            x_normal_vector_value.setText(" x = "+String.valueOf(xAccelerometerValue*Math.pow(Math.pow(Math.pow(xAccelerometerValue,2)+Math.pow(yAccelerometerValue,2)+Math.pow(zAccelerometerValue,2), 0.5), -1)));
            y_normal_vector_value.setText(" y = "+String.valueOf(yAccelerometerValue*Math.pow(Math.pow(Math.pow(xAccelerometerValue,2)+Math.pow(yAccelerometerValue,2)+Math.pow(zAccelerometerValue,2), 0.5), -1)));
            z_normal_vector_value.setText(" z = "+String.valueOf(zAccelerometerValue*Math.pow(Math.pow(Math.pow(xAccelerometerValue,2)+Math.pow(yAccelerometerValue,2)+Math.pow(zAccelerometerValue,2), 0.5), -1)));
        }
    });


   }

 SensorEventListener AccelerometerSensorEventListener
   = new SensorEventListener(){

    @Override
       public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO Auto-generated method stub
        }

@Override
      public void onSensorChanged(SensorEvent event) {
       // TODO Auto-generated method stub
       if(event.sensor.getType()==Sensor.TYPE_ACCELEROMETER){

           xAccelerometerValue=event.values[0];
           yAccelerometerValue=event.values[1];
           zAccelerometerValue=event.values[2];

       }
     }};

 /*
   SensorEventListener GravitySensorEventListener
    = new SensorEventListener(){

       @Override
       public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO Auto-generated method stub
        }

       @Override
       public void onSensorChanged(SensorEvent event) {
        // TODO Auto-generated method stub
           if(event.sensor.getType()==Sensor.TYPE_GRAVITY){
               xGravityValue=event.values[0];
               yGravityValue=event.values[1];
               zGravityValue=event.values[2];
           }
        }
    };
     */


}

答案 2 :(得分：1)

问题只是第69行的额外}，我刚删除它。您可以在项目中粘贴以下代码，它将正常工作，

public class MainActivity extends Activity {

    private SensorManager mySensorManager;
    private Sensor myGravitySensor;
    private Sensor  myAccelerometerSensor;

    TextView x_position_value;
    TextView y_position_value;
    TextView z_position_value;
    TextView x_normal_vector_value;
    TextView y_normal_vector_value;
    TextView z_normal_vector_value;
    TextView textLightSensor;

    private float xPositionValue=0;
    private float yPositionValue=0;
    private float zPositionValue=0;

    private float xAccelerometerValue=0;
    private float yAccelerometerValue=0;
    private float zAccelerometerValue=0;


    private float xGravityValue=0;
    private float yGravityValue=0;
    private float zGravityValue=0;


    Button loc;


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



        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        loc = (Button) findViewById(R.id.localize);

        x_position_value = (TextView) findViewById(R.id.x_position_value);
        y_position_value = (TextView) findViewById(R.id.y_position_value);
        z_position_value = (TextView) findViewById(R.id.z_position_value);

        mySensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
        myGravitySensor = mySensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);
        myAccelerometerSensor = mySensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

        if (myAccelerometerSensor == null){
            textLightSensor.setText("No Accelerometer Sensor!");
        }else{
            //mySensorManager.registerListener(GravitySensorEventListener, myGravitySensor, SensorManager.SENSOR_DELAY_FASTEST);
            mySensorManager.registerListener(AccelerometerSensorEventListener, myAccelerometerSensor, SensorManager.SENSOR_DELAY_FASTEST);
        }


        SensorEventListener AccelerometerSensorEventListener
        = new SensorEventListener(){

            @Override
            public void onAccuracyChanged(Sensor sensor, int accuracy) {
                // TODO Auto-generated method stub
            }

            @Override
            public void onSensorChanged(SensorEvent event) {
                // TODO Auto-generated method stub
                if(event.sensor.getType()==Sensor.TYPE_ACCELEROMETER){

                    xAccelerometerValue=event.values[0];
                    yAccelerometerValue=event.values[1];
                    zAccelerometerValue=event.values[2];

                }
            }};

            /*
   SensorEventListener GravitySensorEventListener
    = new SensorEventListener(){

       @Override
       public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO Auto-generated method stub
        }

       @Override
       public void onSensorChanged(SensorEvent event) {
        // TODO Auto-generated method stub
           if(event.sensor.getType()==Sensor.TYPE_GRAVITY){
               xGravityValue=event.values[0];
               yGravityValue=event.values[1];
               zGravityValue=event.values[2];
           }
        }
    };
             */

            //MY PROBLEM IS HERE    
            loc.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub

                    x_normal_vector_value.setText(" x = "+String.valueOf(xAccelerometerValue*Math.pow(Math.pow(Math.pow(xAccelerometerValue,2)+Math.pow(yAccelerometerValue,2)+Math.pow(zAccelerometerValue,2), 0.5), -1)));
                    y_normal_vector_value.setText(" y = "+String.valueOf(yAccelerometerValue*Math.pow(Math.pow(Math.pow(xAccelerometerValue,2)+Math.pow(yAccelerometerValue,2)+Math.pow(zAccelerometerValue,2), 0.5), -1)));
                    z_normal_vector_value.setText(" z = "+String.valueOf(zAccelerometerValue*Math.pow(Math.pow(Math.pow(xAccelerometerValue,2)+Math.pow(yAccelerometerValue,2)+Math.pow(zAccelerometerValue,2), 0.5), -1)));
                }
            });
    }
}
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