SensorManager“线程启动”错误

Question

我正在尝试制作一个使用加速度计来检测用户运动并触发一些事件的应用。该应用程序需要大量工作，但每次我在手机中运行该应用程序时，我都会收到错误“线程启动”，但似乎什么也没发生。

这里是 LogCat：

    04-15 17:46:21.380: E/BANANA(2516): Before sensor
    04-15 17:46:21.380: D/SensorManager(2516): registerListener :: handle = 0  name= K2DM delay= 200000 Listener= com.example.rockpaperaccelerate.UseSensor@413cdf98
    04-15 17:46:21.380: E/SensorManager(2516): thread start
    04-15 17:46:21.520: E/BANANA(2516): AFter sensor
    04-15 17:46:21.680: D/libEGL(2516): loaded /system/lib/egl/libGLES_android.so
    04-15 17:46:21.800: D/libEGL(2516): loaded /system/lib/egl/libGLES_rhea.so
    04-15 17:46:21.960: D/BRCM_EGL(2516): eglCreateContext() config: 18 context: 0x12e0a0, VC context 1, Thread 2516
    04-15 17:46:21.960: D/BRCM_EGL(2516): eglCreateWindowSurface() surface: 0x2aa080, VC surface: 1, Thread: 2516
    04-15 17:46:21.960: D/BRCM_EGL(2516): eglMakeCurrent(0x12e0a0, 0x2aa080, 0x2aa080) Thread: 2516
    04-15 17:46:21.980: D/OpenGLRenderer(2516): Enabling debug mode 0
    04-15 17:46:22.441: D/CLIPBOARD(2516): Hide Clipboard dialog at Starting input: finished by someone else... !

这就是一切发生的活动：

public class UseSensor extends Activity implements SensorEventListener{

    private SensorManager mSensorManager;
    private Sensor mSensor;
    public int choice;
    public WebView myWebView1;
    public WebView myWebView2;
    public TextView myTextView;
    public String louts[]={"rock","paper","scissors"};
    public int i=0;
    public float gravity[]={0,0,0}; 
    public float linear_acceleration[]={0,0,0};

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rock_paper_accelerate_with_sensors);
        Log.e("BANANA","Before sensor");

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


        Log.e("BANANA","AFter sensor");


    }

    public void onRadioButtonClicked(View view) {
        // Is the button now checked?
        boolean checked = ((RadioButton) view).isChecked();

        // Check which radio button was clicked
        switch(view.getId()) {
            case R.id.radio1:
                if (checked)
                    // player chose rock
                    choice=1;

                break;              
            case R.id.radio2:
                if (checked)
                    // player chose paper
                    choice=2;

                break;
            case R.id.radio3:
                if (checked)
                    // player chose scissors
                    choice=3;

                break;  
        }



    }

public void checkWin(int choice){

        Random generator = new Random();
        int machine = generator.nextInt( 3 )+1;
        setContentView(R.layout.show_results);
        myWebView1 = (WebView) findViewById(R.id.webView1);
        myWebView2 = (WebView) findViewById(R.id.webView2);
        myTextView = (TextView) findViewById(R.id.textView1);
        switch (machine){
        case 1: myWebView1.loadUrl("file:///android_asset/1.jpg");
        break;
        case 2: myWebView1.loadUrl("file:///android_asset/2.jpg");
        break;
        case 3: myWebView1.loadUrl("file:///android_asset/3.jpg");
        break;
        }

        switch (choice){
        case 1: myWebView2.loadUrl("file:///android_asset/1.jpg");
        break;
        case 2: myWebView2.loadUrl("file:///android_asset/2.jpg");
        break;
        case 3: myWebView2.loadUrl("file:///android_asset/3.jpg");
        break;
        }

        if (choice==machine){
            myTextView.setText("This is a tie!");
        }
        else if ((choice==3 && machine==2)||(choice==2 && machine==1)||(choice==1 && machine==3)){
            myTextView.setText("You Win!");
        }
        else{
            myTextView.setText("You Lose!");
        }
        Button myButton =  (Button)findViewById(R.id.button1);
        myButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                i=0;
                Intent intent= new Intent(v.getContext(), UseSensor.class);
                startActivityForResult(intent, 0);

            }
        });


    }

    @Override
    public void onAccuracyChanged(Sensor arg0, int arg1) {
        // TODO Auto-generated method stub

    }
    @Override

    public void onSensorChanged(SensorEvent event) {


        final float alpha = (float) 0.8;

        gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
        gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
        gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];

        linear_acceleration[0] = event.values[0] - gravity[0];
        linear_acceleration[1] = event.values[1] - gravity[1];
        linear_acceleration[2] = event.values[2] - gravity[2];

          if (linear_acceleration[1]<-4.0){
             if(i<3){
                 int findId = this.getResources().getIdentifier("com.example.rockpaperaccelerate:layout/" + louts[i], null, null);
                 setContentView(findId);
                 i=i+1;}

              if (i==3){
                  mSensorManager.unregisterListener(this);
                  i=0;
                  checkWin(choice);
              }
          }


    }


}

这可能是 this 案例中的误报，还是我做错了什么。活动继续进行而不停止。在调用 UseSensor 的主要活动中，我再次使用 SensorManager。 代码的sn-p为：

mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
         if (mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) != null){
              // Success! There's an accelerometer sensor       
             Intent intent= new Intent(this,UseSensor.class);
             startActivity(intent);

         }

这与错误有关吗？

感谢您的宝贵时间。

------------编辑-------------

错误仍然存​​在，但它仅在我第一次从 eclipse 运行应用程序时出现。如果我停止应用程序并从手机的主屏幕再次运行它，它不会出现。应用程序有时会停止工作但没有给我任何其他错误。我稍微更改了我的代码，添加了另一个 if

if(choice !=0){
          if (linear_acceleration[1]<-4.0){
             if(i<3){
                 int findId = this.getResources().getIdentifier("com.example.rockpaperaccelerate:layout/" + louts[i], null, null);
                 setContentView(findId);
                 i=i+1;}

              if (i==3){
                  mSensorManager.unregisterListener(this);

                  i=0;
                  checkWin(choice);
              }
          }
        }

我还尝试了 Lukas 建议的 here，但没有成功。我还实现了我的应用程序的另一个版本，它只有一个活动，问题仍然存在。唯一发生的事情是，有时应用程序停止工作而没有任何其他 logCat 错误

第二次实施

public class RockPaper3 extends Activity implements SensorEventListener {


    private SensorManager mSensorManager;
    private Sensor mSensor;
    public int choice=0;
    public ImageView myImage1,myImage2; 
    public TextView myTextView;
    public String louts[]={"rock","paper","scissors"};
    public int i=0;
    public float gravity[]={0,0,0}; 
    public float linear_acceleration[]={0,0,0};
    public boolean withSensor=true;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


            mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
            mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
            mSensorManager.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_NORMAL);
             if (mSensor != null){
                  // Success! There's an accelerometer sensor       
                setContentView(R.layout.rock_paper_accelerate_with_sensors);
                 withSensor=true;


             }
             else {

                    mSensorManager.unregisterListener(this);
                    setContentView(R.layout.activity_rock_paper3);
                    withSensor=false;
                  }      


    }

    public void onRadioButtonClicked(View view) {
        // Is the button now checked?
        boolean checked = ((RadioButton) view).isChecked();

        // Check which radio button was clicked
        switch(view.getId()) {
            case R.id.radio1:
                if (checked)
                    // player chose rock
                    choice=1;

                break;              
            case R.id.radio2:
                if (checked)
                    // player chose paper
                    choice=2;

                break;
            case R.id.radio3:
                if (checked)
                    // player chose scissors
                    choice=3;

                break;  
        }

        if (withSensor==false){
            checkWin(choice);
        }

    }


public void checkWin(int choice){

        Random generator = new Random();
        int machine = generator.nextInt( 3 )+1;
        setContentView(R.layout.show_results);
        myImage1 = (ImageView) findViewById(R.id.imageView1);
        myImage2 = (ImageView) findViewById(R.id.imageView2);
        myTextView = (TextView) findViewById(R.id.textView1);
        switch (machine){
        case 1: myImage1.setImageResource(R.drawable.rock);
        break;
        case 2: myImage1.setImageResource(R.drawable.paper);
        break;
        case 3: myImage1.setImageResource(R.drawable.scissors);
        break;
        }

        switch (choice){
        case 1: myImage2.setImageResource(R.drawable.rock);
        break;
        case 2: myImage2.setImageResource(R.drawable.paper);
        break;
        case 3: myImage2.setImageResource(R.drawable.scissors);
        break;
        }

        if (choice==machine){
            myTextView.setText("This is a tie!");
        }
        else if ((choice==3 && machine==2)||(choice==2 && machine==1)||(choice==1 && machine==3)){
            myTextView.setText("You Win!");
        }
        else{
            myTextView.setText("You Lose!");
        }
        Button myButton =  (Button)findViewById(R.id.button1);
        myButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                i=0;
                Intent intent= new Intent(v.getContext(), RockPaper3.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                finish();
                startActivity(intent);


            }
        });


    }


    /*
public void checkWin(int choice){

        Random generator = new Random();
        int machine = generator.nextInt( 3 )+1;
        setContentView(R.layout.show_results);
        myWebView1 = (WebView) findViewById(R.id.webView1);
        myWebView2 = (WebView) findViewById(R.id.webView2);
        myTextView = (TextView) findViewById(R.id.textView1);
        switch (machine){
        case 1: myWebView1.loadUrl("file:///android_asset/1.jpg");
        break;
        case 2: myWebView1.loadUrl("file:///android_asset/2.jpg");
        break;
        case 3: myWebView1.loadUrl("file:///android_asset/3.jpg");
        break;
        }

        switch (choice){
        case 1: myWebView2.loadUrl("file:///android_asset/1.jpg");
        break;
        case 2: myWebView2.loadUrl("file:///android_asset/2.jpg");
        break;
        case 3: myWebView2.loadUrl("file:///android_asset/3.jpg");
        break;
        }

        if (choice==machine){
            myTextView.setText("This is a tie!");
        }
        else if ((choice==3 && machine==2)||(choice==2 && machine==1)||(choice==1 && machine==3)){
            myTextView.setText("You Win!");
        }
        else{
            myTextView.setText("You Lose!");
        }
        Button myButton =  (Button)findViewById(R.id.button1);
        myButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                i=0;
                Intent intent= new Intent(v.getContext(), RockPaper3.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                finish();
                startActivity(intent);


            }
        });


    }*/ 

    @Override
    protected void onResume(){
        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        mSensorManager.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_NORMAL);
        super.onResume();

    }

    @Override
    protected void onPause(){
        mSensorManager.unregisterListener(this);
        super.onPause(); 
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.rock_paper3, menu);
        return true;
    }


    @Override
    public void onAccuracyChanged(Sensor arg0, int arg1) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onSensorChanged(SensorEvent event) {


        final float alpha = (float) 0.8;

        gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];

        linear_acceleration[1] = event.values[1] - gravity[1];

        if(choice !=0){
          if (linear_acceleration[1]<-4.0){
             if(i<3){
                 int findId = this.getResources().getIdentifier("com.example.rockpaperv3:layout/" + louts[i], null, null);
                 setContentView(findId);
                 i=i+1;}

              if (i==3){
                          mSensorManager.unregisterListener(this);
                          i=0;
                          checkWin(choice);
                        }
                }
            }

    }
}

知道这个错误是什么意思，为什么我的应用有时会崩溃而没有任何错误？我突然想到，我的手机可能太重了，无法处理这个写得很糟糕的应用程序，其中包含所有加速度计注册。

---

编辑2

注册监听器时出现错误

---

编辑3

做了很多修改后，应用运行流畅，但错误始终存在。注册监听器时一定是误报

Answer 1

将您的代码更改为：

在 onResume 你应该注册你的听众

在 onPause 中你取消注册你的监听器

创建一个布尔值 isActive，

并将您的 onclicklistener 更改为：

Button myButton =  (Button)findViewById(R.id.button1);
    myButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            i=0;
            isActive=true;
        }
    });

将您的 onSensorChanged 更改为：

@Override
public void onSensorChanged(SensorEvent event) {
    if(!isActive)return;

    final float alpha = (float) 0.8;

    gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];

    linear_acceleration[1] = event.values[1] - gravity[1];

      if (linear_acceleration[1]<-4.0){
         if(i<3){
             int findId = this.getResources().getIdentifier("com.example.rockpaperaccelerate:layout/" + louts[i], null, null);
             setContentView(findId);
             i=i+1;}

          if (i==3){
      isActive=false;
              i=0;
              checkWin(choice);
          }
      }
}

编辑： 或者你像下面的代码那样做，但我真的不建议你这样做 将您的点击监听器更改为：

    myButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            i=0;
     mSensorManager.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_NORMAL);

        }
    });