Question

我正在尝试使用我在Android应用程序中使用TranslateAnimation的sensorchange（在加速度计上）移动一个imageview（球图像）。但是应用程序不会移动imageview。我的日志看起来应用程序甚至没有注册加速度计，我只看到屏幕上的球图像视图在一个地方不变。有人可以帮我解决我在这里做错了什么吗？我的代码和日志如下：

public class MainActivity extends Activity implements SensorEventListener {

private ImageView ball=null;
public static int nwidth, nheight;
public static float xPosition, yPosition,oldx=0,oldy=0;
private float xAcceleration=0.0f,xVelocity = 0.0f;
private float yAcceleration=0.0f,yVelocity = 0.0f;
private float zAcceleration=0.0f;
public float frameTime = 0.999f;
private float mAlpha = 0.9f;
private static final String TAG = "Readings";
String toWrite=null;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ball = (ImageView) findViewById(R.id.image_ball);
    getScreenSize();
    setContentView(R.layout.activity_main);
}


private void getScreenSize()
{
    Point displaySize = new Point();
     getWindowManager().getDefaultDisplay().getRealSize(displaySize);

    Rect windowSize = new Rect();
    getWindow().getDecorView().getWindowVisibleDisplayFrame(windowSize);

   nwidth  = displaySize.x - Math.abs(windowSize.width());
   nheight  = displaySize.y - Math.abs(windowSize.height());
}




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



@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
public void onSensorChanged(SensorEvent sensorEvent)
{
    {
        if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

            yAcceleration = lowPass(sensorEvent.values[1], yAcceleration);
            xAcceleration = lowPass(sensorEvent.values[2],xAcceleration);
            zAcceleration = lowPass(sensorEvent.values[0],zAcceleration);

            toWrite = sensorEvent.values[0] + "," + sensorEvent.values[2] + "\n";
            writeCSV(toWrite);


            Log.i(TAG, "x:" + xAcceleration + " y:" + yAcceleration + "z:" + zAcceleration);
            updateBall();
        }

    }
}



// simple low-pass filter
float lowPass(float current, float filtered) {
    return mAlpha * current + (1.0f - mAlpha) * filtered;
}




private void writeCSV(String txtData)
{
    try {
        File myFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/"+ "Readings.txt");
        myFile.createNewFile();
        FileOutputStream fOut = new FileOutputStream(myFile,true);
        OutputStreamWriter myOutWriter =
                new OutputStreamWriter(fOut);
        myOutWriter.append(txtData);
        myOutWriter.close();
        fOut.close();

    } catch (Exception e) {
        Toast.makeText(getBaseContext(), e.getMessage(),
                Toast.LENGTH_SHORT).show();
    }

}


private void updateBall() {
   //for landscape orientation, treating z axis as x.

    xVelocity = (-zAcceleration * frameTime);
    float xS = (xVelocity)*frameTime;
    xPosition += xS;
    // yPosition += yS;
    yPosition++;
    setPosition();

    Log.i(TAG,"x:" + xAcceleration +" y:" + yAcceleration);
}

 private void setPosition()
 {
     TranslateAnimation animation = new TranslateAnimation(oldx, xPosition, oldy, yPosition);
     animation.setDuration(10);
     animation.setFillAfter(false);
     animation.setAnimationListener(new MyAnimationListener(ball));

     ball.startAnimation(animation);
     oldx=xPosition;
     oldy=yPosition;
 }


@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {

}

}

class MyAnimationListener implements Animation.AnimationListener {
  ImageView imageView=null;

   public MyAnimationListener(ImageView image)
   {
       imageView=image;
   }



@Override
public void onAnimationEnd(Animation animation) {
    imageView.clearAnimation();
    ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(imageView.getWidth(), imageView.getHeight());
  //  lp.setMargins(50, 100, 0, 0);
    imageView.setLayoutParams(lp);
}

@Override
public void onAnimationRepeat(Animation animation) {
}

@Override
public void onAnimationStart(Animation animation) {
}

}

08-12 01:03:21.348: I/art(3404): Late-enabling -Xcheck:jni
08-12 01:03:21.386: E/art(3404): Failed sending reply to debugger: Broken pipe
08-12 01:03:21.386: I/art(3404): Debugger is no longer active
08-12 01:03:21.516: D/OpenGLRenderer(3404): Render dirty regions requested: true
08-12 01:03:21.522: D/Atlas(3404): Validating map...
08-12 01:03:21.568: I/OpenGLRenderer(3404): Initialized EGL, version 1.4
08-12 01:03:21.609: D/OpenGLRenderer(3404): Enabling debug mode 0

谢谢！

Answer 1

package com.example.test;

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;

public class MainActivity extends Activity implements SensorEventListener {

    SensorManager mSensorManager;
    Sensor mSensor;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        mSensorManager.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_NORMAL);

    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        mSensorManager.unregisterListener(this);
    }

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

    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        // TODO Auto-generated method stub

    }
}

ImageView根本没有动画 - Android

1 个答案: