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我正在尝试制作一个使用加速度计的应用程序，但是当我运行我的应用程序时，它说不幸的是应用程序已停止。我有其他代码，但我删除了它，因为我认为它弄乱了代码，但事实并非如此。

这是代码

`

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Intent one = new Intent(getApplicationContext(), act.class);
    startActivity(one);


}


        }
          class act extends Activity implements SensorEventListener {
              Intent one = getIntent();
              private SensorManager sensorManager;
                private Sensor accelerometer;
             float x,y,z;   
             @Override
             public void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);

                    setContentView(R.layout.activity2);
                    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
                    accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
             }

             protected void onResume() {
                    super.onResume();
                    sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
                }
                protected void onPause() {
                    super.onPause();
                    sensorManager.unregisterListener(this);
                }


           @Override
           public void onAccuracyChanged(Sensor accelerometer, int accuracy) {
           }
             public void onSensorChanged(SensorEvent event) {

                    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

                        x = event.values[0];
                        y = event.values[1];
                        z = event.values[2];

                    }
                        }

             }`

两个类都在同一个文件中

日志猫：

02-19 14:32:24.490: E/AndroidRuntime(7916): FATAL EXCEPTION: main
02-19 14:32:24.490: E/AndroidRuntime(7916): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.a3/com.example.a3.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.a3/com.example.a3.act}; have you declared this activity in your AndroidManifest.xml?
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.os.Looper.loop(Looper.java:137)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.ActivityThread.main(ActivityThread.java:5039)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at java.lang.reflect.Method.invokeNative(Native Method)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at java.lang.reflect.Method.invoke(Method.java:511)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at dalvik.system.NativeStart.main(Native Method)
02-19 14:32:24.490: E/AndroidRuntime(7916): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.a3/com.example.a3.act}; have you declared this activity in your AndroidManifest.xml?
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1618)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.Activity.startActivityForResult(Activity.java:3370)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.Activity.startActivityForResult(Activity.java:3331)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.Activity.startActivity(Activity.java:3566)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.Activity.startActivity(Activity.java:3534)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at com.example.a3.MainActivity.onCreate(MainActivity.java:32)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.Activity.performCreate(Activity.java:5104)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
02-19 14:32:24.490: E/AndroidRuntime(7916):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
02-19 14:32:24.490: E/AndroidRuntime(7916):     ... 11 more
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1 回答 1

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您可能没有在清单中正确声明行为活动。在你的项目上运行 android lint，看看它是否告诉你发生了什么。或者在 Eclipse 中查看所有清单查看器选项卡（不仅仅是代码）中的清单文件，看看它是否给你红色警告。

于 2013-02-18T19:56:46.010 回答