應用程序在新活動開始時崩潰（使用加速度計數據）

嗨試圖實施this（我的活動稱爲main）作爲我的應用程序的一項活動，可以通過按MainPage java類中的按鈕啓動，但每個當我點擊按鈕啓動它崩潰的活動時，我想這可能與請求使用加速度計數據的權限有關，但我不確定。應用程序在新活動開始時崩潰（使用加速度計數據）

感謝所有幫助

這裏的的MainPage與從推出我有麻煩的活動：

package shake.shake; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageButton; 

public class MainPage extends AppCompatActivity { 
    private static Button ShakeButton1; 
    private static ImageButton SettingsButton1; 
    private static ImageButton HistoryButton1; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main_page); 
     OnClickButtonListener(); 
    } 
    public void OnClickButtonListener() 
    { 
     ShakeButton1 = (Button)findViewById(R.id.ShakeButton); 
     ShakeButton1.setOnClickListener(
       new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         Intent intentSecondActivity = new Intent(MainPage.this, main.class); 
         startActivity(intentSecondActivity); 
          } 
       }); 
     SettingsButton1 = (ImageButton)findViewById(R.id.SettingsButton); 
     SettingsButton1.setOnClickListener(
       new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         Intent intentSecondActivity = new Intent(MainPage.this, Settingspage.class); 
         startActivity(intentSecondActivity); 
        } 
       }); 
     HistoryButton1 = (ImageButton)findViewById(R.id.HistoryButton); 
     HistoryButton1.setOnClickListener(
       new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         Intent intentSecondActivity = new Intent(MainPage.this, Historypage.class); 
         startActivity(intentSecondActivity); 
        } 
       }); 
}}

這裏是一個崩潰的應用程序的活動：

package shake.shake; 

/** 
* Created by ink on 3/24/16. 
*/ 
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.ImageView; 
import android.widget.TextView; 

public class main extends Activity implements SensorEventListener { 
    private float mLastX, mLastY, mLastZ; 
    private boolean mInitialized; 
    private SensorManager mSensorManager; 
    private Sensor mAccelerometer; 
    private final float NOISE = (float) 2.0; 
    /** Called when the activity is first created. */ 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     mInitialized = false; 
     mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); 
     mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
     mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL); 
    } 
    protected void onResume() { 
     super.onResume(); 
     mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL); 
    } 
    protected void onPause() { 
     super.onPause(); 
     mSensorManager.unregisterListener(this); 
    } 

    @Override 
    public void onAccuracyChanged(Sensor sensor, int accuracy) { 
// can be safely ignored for this demo 
    } 

    @Override 
    public void onSensorChanged(SensorEvent event) { 
     TextView tvX= (TextView)findViewById(R.id.x_axis); 
     TextView tvY= (TextView)findViewById(R.id.y_axis); 
     TextView tvZ= (TextView)findViewById(R.id.z_axis); 
     ImageView iv = (ImageView)findViewById(R.id.image); 
     float x = event.values[0]; 
     float y = event.values[1]; 
     float z = event.values[2]; 
     if (!mInitialized) { 
      mLastX = x; 
      mLastY = y; 
      mLastZ = z; 
      tvX.setText("0.0"); 
      tvY.setText("0.0"); 
      tvZ.setText("0.0"); 
      mInitialized = true; 
     } 
     else { 
      float deltaX = Math.abs(mLastX - x); 
      float deltaY = Math.abs(mLastY - y); 
      float deltaZ = Math.abs(mLastZ - z); 
      if (deltaX < NOISE) deltaX = (float)0.0; 
      if (deltaY < NOISE) deltaY = (float)0.0; 
      if (deltaZ < NOISE) deltaZ = (float)0.0; 
      mLastX = x; 
      mLastY = y; 
      mLastZ = z; 
      tvX.setText(Float.toString(deltaX)); 
      tvY.setText(Float.toString(deltaY)); 
      tvZ.setText(Float.toString(deltaZ)); 
      iv.setVisibility(View.VISIBLE); 
      if (deltaX > deltaY) { 
       iv.setImageResource(R.drawable.horizontal); 
      } else if (deltaY > deltaX) { 
       iv.setImageResource(R.drawable.vertical); 
      } else { 
       iv.setVisibility(View.INVISIBLE); 
      } 
     } 
    } 
}

這裏的清單：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="shake.shake"> 
    <uses-feature android:name="android.hardware.sensor.accelerometer" android:required="true" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainPage"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity 
      android:name=".Settingspage" 
      android:label="@string/title_activity_settingspage" /> 
     <activity 
      android:name=".Historypage" 
      android:label="@string/title_activity_historypage" 
      android:theme="@style/AppTheme.NoActionBar"></activity> 
    </application> 

</manifest>

和這裏的系統崩潰日誌：

03-27 21:55:40.742 19759-19759/shake.shake E/AndroidRuntime: FATAL EXCEPTION: main 
 
                  Process: shake.shake, PID: 19759 
 
                  android.content.ActivityNotFoundException: Unable to find explicit activity class {shake.shake/shake.shake.main}; have you declared this activity in your AndroidManifest.xml? 
 
                   at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1794) 
 
                   at android.app.Instrumentation.execStartActivity(Instrumentation.java:1512) 
 
                   at android.app.Activity.startActivityForResult(Activity.java:3930) 
 
                   at android.app.Activity.startActivityForResult(Activity.java:3890) 
 
                   at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843) 
 
                   at android.app.Activity.startActivity(Activity.java:4213) 
 
                   at android.app.Activity.startActivity(Activity.java:4181) 
 
                   at shake.shake.MainPage$1.onClick(MainPage.java:29) 
 
                   at android.view.View.performClick(View.java:5204) 
 
                   at android.view.View$PerformClick.run(View.java:21155) 
 
                   at android.os.Handler.handleCallback(Handler.java:739) 
 
                   at android.os.Handler.dispatchMessage(Handler.java:95) 
 
                   at android.os.Looper.loop(Looper.java:148) 
 
                   at android.app.ActivityThread.main(ActivityThread.java:5422) 
 
                   at java.lang.reflect.Method.invoke(Native Method) 
 
                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
 
                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

來源

2016-03-28 Ian Kirkpatrick

你添加'<使用，功能的Android：NAME =「android.hardware .sensor.accelerometer「android：required =」true「/>'，嚴格來說這不是必需的，但我不熟悉最近發生了什麼變化？ –

發佈您的Logcat –

您是否檢查了源代碼（可在您提供的鏈接中找到）？你也不需要特別的權限來訪問這個特定的傳感器。 –

添加清單關於你的「主」類

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="shake.shake"> 
    <uses-feature android:name="android.hardware.sensor.accelerometer" android:required="true" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainPage"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity 
      android:name=".main" /> 
     <activity 
      android:name=".Settingspage" 
      android:label="@string/title_activity_settingspage" /> 
     <activity 
      android:name=".Historypage" 
      android:label="@string/title_activity_historypage" 
      android:theme="@style/AppTheme.NoActionBar"></activity> 
    </application> 

</manifest>

來源

2016-03-28 02:12:05 Kae10

應用程序在新活動開始時崩潰（使用加速度計數據）

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