java - 应用程序在新 Activity 开始时崩溃(使用加速计数据)

Question

您好，正在尝试实现 this (我的 Activity 称为 main)作为我的应用程序的 Activity ，可以通过按 MainPage java 类中的按钮来启动该 Activity ，但每次我点击按钮启动该 Activity 时它都会崩溃，我认为这可能与请求使用加速度计数据的权限，但我不确定。

感谢您的帮助

这是我遇到问题的 Activity 的主页:

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);
                    }
                });
}}

这是导致应用程序崩溃的 Activity :

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);
            }
        }
    }
}

这也是 list :

<?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>

这是崩溃日志:

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)

Answer 1

添加有关“主”类的 list

<?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>