Bei Verwendung von Beschleunigungsmesser stürzt die Anwendung ab

Question

Ich kann nicht finden, wo das Problem liegt.Wenn ich das Telefon schüttle, sollte es sich ändern der Text der Textansicht, aber stattdessen stürzt er ab, wenn ich ihn schüttle.Was ist das Problem in meinem Code?Ich habe versucht, auf den Logcat zu schauen, aber ich bin noch nicht in der Lage, etwas daraus zu verstehen (vor allem, weil meine Muttersprache nicht Englisch ist).Danke!Haupttätigkeit

package nir.rauch.accelrate;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Vibrator;
import android.widget.TextView;

public class MainActivity extends Activity
{
  private ShakeListener mShaker;
public TextView text;
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
final TextView text =(TextView)findViewById(R.id.textView1);
    final Vibrator vibe = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
mShaker = new ShakeListener(this);
mShaker.setOnShakeListener(new ShakeListener.OnShakeListener () {
  public void onShake()
  {
    vibe.vibrate(100);
   text.setText("" + "what a suprise! after the shaking The text has been changed and it also "
        + "Vibrates , so AMAZING!");
  }
});
  }

  @Override
  public void onResume()
  {
    mShaker.resume();
    super.onResume();
  }
  @Override
  public void onPause()
  {
    mShaker.pause();
    super.onPause();
  }
}

Die Shaker-Aktivität

    package nir.rauch.accelrate;

import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.content.Context;
import java.lang.UnsupportedOperationException;

public class ShakeListener implements SensorListener 
{
  private static final int FORCE_THRESHOLD = 350;
  private static final int TIME_THRESHOLD = 100;
  private static final int SHAKE_TIMEOUT = 500;
  private static final int SHAKE_DURATION = 1000;
  private static final int SHAKE_COUNT = 3;

  private SensorManager mSensorMgr;
  private float mLastX=-1.0f, mLastY=-1.0f, mLastZ=-1.0f;
  private long mLastTime;
  private OnShakeListener mShakeListener;
  private Context mContext;
  private int mShakeCount = 0;
  private long mLastShake;
  private long mLastForce;

  public interface OnShakeListener
  {
    public void onShake();
  }

  public ShakeListener(Context context) 
  { 
    mContext = context;
    resume();
  }

  public void setOnShakeListener(OnShakeListener listener)
  {
    mShakeListener = listener;
  }

  public void resume() {
    mSensorMgr = (SensorManager)mContext.getSystemService(Context.SENSOR_SERVICE);
    if (mSensorMgr == null) {
      throw new UnsupportedOperationException("Sensors not supported");
    }
    boolean supported = mSensorMgr.registerListener(this, SensorManager.SENSOR_ACCELEROMETER, SensorManager.SENSOR_DELAY_GAME);
    if (!supported) {
      mSensorMgr.unregisterListener(this, SensorManager.SENSOR_ACCELEROMETER);
      throw new UnsupportedOperationException("Accelerometer not supported");
    }
  }

  public void pause() {
    if (mSensorMgr != null) {
      mSensorMgr.unregisterListener(this, SensorManager.SENSOR_ACCELEROMETER);
      mSensorMgr = null;
    }
  }

  public void onAccuracyChanged(int sensor, int accuracy) { }

  public void onSensorChanged(int sensor, float[] values) 
  {
    if (sensor != SensorManager.SENSOR_ACCELEROMETER) return;
    long now = System.currentTimeMillis();

    if ((now - mLastForce) > SHAKE_TIMEOUT) {
      mShakeCount = 0;
    }

    if ((now - mLastTime) > TIME_THRESHOLD) {
      long diff = now - mLastTime;
      float speed = Math.abs(values[SensorManager.DATA_X] + values[SensorManager.DATA_Y] + values[SensorManager.DATA_Z] - mLastX - mLastY - mLastZ) / diff * 10000;
      if (speed > FORCE_THRESHOLD) {
        if ((++mShakeCount >= SHAKE_COUNT) && (now - mLastShake > SHAKE_DURATION)) {
          mLastShake = now;
          mShakeCount = 0;
          if (mShakeListener != null) { 
            mShakeListener.onShake(); 
          }
        }
        mLastForce = now;
      }
      mLastTime = now;
      mLastX = values[SensorManager.DATA_X];
      mLastY = values[SensorManager.DATA_Y];
      mLastZ = values[SensorManager.DATA_Z];
    }
  }

}

Die XML-Datei:

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="40sp"
        android:text="Does the Accelorometer works? Shake it and found out!" />


</RelativeLayout>

mein LOGCAT:

    04-12 18:49:15.831: E/SensorManager(5343): Exception dispatching input event.
04-12 18:49:15.831: E/AndroidRuntime(5343): FATAL EXCEPTION: main
04-12 18:49:15.831: E/AndroidRuntime(5343): java.lang.SecurityException: Requires VIBRATE permission
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.os.Parcel.readException(Parcel.java:1431)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.os.Parcel.readException(Parcel.java:1385)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.os.IVibratorService$Stub$Proxy.vibrateMagnitude(IVibratorService.java:342)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.os.SystemVibrator.vibrate(SystemVibrator.java:115)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.os.SystemVibrator.vibrate(SystemVibrator.java:83)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at nir.rauch.accelrate.MainActivity$1.onShake(MainActivity.java:25)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at nir.rauch.accelrate.ShakeListener.onSensorChanged(ShakeListener.java:79)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.hardware.LegacySensorManager$LegacyListener.onSensorChanged(LegacySensorManager.java:274)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.hardware.SystemSensorManager$SensorEventQueue.dispatchSensorEvent(SystemSensorManager.java:467)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.os.MessageQueue.nativePollOnce(Native Method)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.os.MessageQueue.next(MessageQueue.java:132)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.os.Looper.loop(Looper.java:124)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at android.app.ActivityThread.main(ActivityThread.java:5419)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at java.lang.reflect.Method.invokeNative(Native Method)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at java.lang.reflect.Method.invoke(Method.java:525)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
04-12 18:49:15.831: E/AndroidRuntime(5343):     at dalvik.system.NativeStart.main(Native Method)
04-12 18:55:45.396: E/SensorManager(6408): Exception dispatching input event.
04-12 18:55:45.401: E/AndroidRuntime(6408): FATAL EXCEPTION: main
04-12 18:55:45.401: E/AndroidRuntime(6408): java.lang.SecurityException: Requires VIBRATE permission
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.os.Parcel.readException(Parcel.java:1431)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.os.Parcel.readException(Parcel.java:1385)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.os.IVibratorService$Stub$Proxy.vibrateMagnitude(IVibratorService.java:342)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.os.SystemVibrator.vibrate(SystemVibrator.java:115)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.os.SystemVibrator.vibrate(SystemVibrator.java:83)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at nir.rauch.accelrate.MainActivity$1.onShake(MainActivity.java:25)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at nir.rauch.accelrate.ShakeListener.onSensorChanged(ShakeListener.java:79)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.hardware.LegacySensorManager$LegacyListener.onSensorChanged(LegacySensorManager.java:274)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.hardware.SystemSensorManager$SensorEventQueue.dispatchSensorEvent(SystemSensorManager.java:467)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.os.MessageQueue.nativePollOnce(Native Method)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.os.MessageQueue.next(MessageQueue.java:132)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.os.Looper.loop(Looper.java:124)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at android.app.ActivityThread.main(ActivityThread.java:5419)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at java.lang.reflect.Method.invokeNative(Native Method)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at java.lang.reflect.Method.invoke(Method.java:525)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
04-12 18:55:45.401: E/AndroidRuntime(6408):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

als Ihr logcat angeblich,

Java.lang.Sicherheitsausnahme:Erfordert Vibrationsberechtigung

sie benötigen die Vibrationsberechtigung.Sie müssen also die folgende Zeile in die Manifestdatei einfügen:

 <uses-permission android:name="android.permission.VIBRATE"/>