是的，我知道这个问题已被问过很多次了，但这些答案对我来说都没有用吗？我想也许有人只需要解释我的代码。
我的应用程序在SplashScreen.java上启动10秒钟，然后应该加载MainActivity.java。但是，当我运行我的应用程序时，它会启动SplashScreen，但是在10秒后，MainActivity不加载，应用程序说它已停止。
我检查了运行日志，它说“android.content.ActivityNotFoundException：无法找到显式活动类{com.msp.supercarsounds / com.msp.supercarsounds.MainActivity};您是否已在AndroidManifest.xml中声明此活动？“的AndroidManifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.msp.supercarsounds">
<uses-sdk android:minSdkVersion="17"
android:targetSdkVersion="22"/>
<uses-permission
android:name="android.permission.INTERNET"/>
<application
android:largeHeap="true"
android:allowBackup="true"
android:icon="@mipmap/carsounds_logo"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name="com.msp.supercarsounds.SplashScreen"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<activity
android:name="com.msp.supercarsounds.MainActivity" />
<activity
android:name=".AudiPrimary"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
<activity
android:name="com.msp.supercarsounds.RegisterApplication"
android:label="Register Appliction"
android:theme="@style/AppTheme" />
<activity
android:name="com.msp.supercarsounds.Porsche"
android:label="Porsche"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
<activity
android:name="com.msp.supercarsounds.MercedesBenz"
android:label="Mercedes-Benz"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
<activity
android:name="com.msp.supercarsounds.Lamborghini"
android:label="Lamborghini"
android:theme="@style/AppTheme" />
<activity
android:name="com.msp.supercarsounds.Ferrari"
android:label="Ferrari"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
<activity
android:name="com.msp.supercarsounds.BMW"
android:label="BMW"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
<activity
android:name="com.msp.supercarsounds.Jaguar"
android:label="Jaguar"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
<activity
android:name="com.msp.supercarsounds.AstonMartin"
android:label="Aston Martin"
android:theme="@style/AppTheme" />
<activity
android:name="com.msp.supercarsounds.ChooseManufacturer"
android:label="Choose Manufacturer"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
<activity
android:name="com.msp.supercarsounds.Audi"
android:label="Audi"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
<activity
android:name="com.msp.supercarsounds.About"
android:label="About"
android:theme="@style/AppTheme" />
<activity
android:name="com.msp.supercarsounds.Contact"
android:label="Contact"
android:theme="@style/AppTheme" />
<service
android:name=".MyFirebaseMessagingService">
<intent-filter>
<action
android:name="com.google.firebase.MESSAGING.EVENT"/>
</intent-filter>
</service>
<service
android:name=".MyFirebaseInstanceIDService">
<intent-filter>
<action
android:name="com.google.firebase.INSTANCE.ID.EVENT"/>
</intent-filter>
</service>
</manifest>
SplashScreen.java：
package com.msp.supercarsounds;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
public class SplashScreen extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash_screen_layout);
Thread myThread = new Thread() {
@Override
public void run() {
try {
sleep(10000);
Intent startMainActivity = new Intent(getApplicationContext(), MainActivity.class);
startActivity(startMainActivity);
finish();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
myThread.start();
}
}
MainActivity.java：
package com.msp.supercarsounds;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.CheckBox;
public class MainActivity extends AppCompatActivity {
public static final String PREFS_NAME = "MyPrefsFile1";
public CheckBox dontShowAgain;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void clickedAbout(View view) {
final int result = 1;
Intent AboutButtonClicked = new Intent (this, About.class);
AboutButtonClicked.putExtra("About", "MainActivity");
startActivityForResult(AboutButtonClicked, result);
}
public void clickedContact(View view) {
final int result = 1;
Intent ContactButtonClicked = new Intent (this, Contact.class);
ContactButtonClicked.putExtra("Contact", "MainActivity");
startActivityForResult(ContactButtonClicked, result);
}
@Override
protected void onResume() {
AlertDialog.Builder adb = new AlertDialog.Builder(this);
LayoutInflater adbInflater = LayoutInflater.from(this);
View eulaLayout = adbInflater.inflate(R.layout.checkbox, null);
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
String skipMessage = settings.getString("skipMessage", "NOT checked");
dontShowAgain = (CheckBox) eulaLayout.findViewById(R.id.skip);
adb.setView(eulaLayout);
adb.setTitle("PLEASE REGISTER THIS APPLICATION!");
adb.setMessage(Html.fromHtml("Please register this application in order to receive newer versions and support!"));
adb.setPositiveButton("I understand", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
String checkBoxResult = "NOT checked";
if (dontShowAgain.isChecked()) {
checkBoxResult = "checked";
}
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString("skipMessage", checkBoxResult);
editor.commit();
// Do what you want to do on "OK" action
return;
}
});
adb.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
String checkBoxResult = "NOT checked";
if (dontShowAgain.isChecked()) {
checkBoxResult = "checked";
}
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString("skipMessage", checkBoxResult);
editor.commit();
return;
}
});
if (!skipMessage.equals("checked")) {
adb.show();
}
super.onResume();
}
public void clickedSettings(MenuItem item) {
final int result = 1;
Intent SettingsButtonClicked = new Intent (this, About.class);
SettingsButtonClicked.putExtra("About", "MainActivity");
startActivityForResult(SettingsButtonClicked, result);
}
public void clickedSupercarSounds(View view) {
final int result = 1;
Intent SupercarSoundsButtonClicked = new Intent (this, ChooseManufacturer.class);
SupercarSoundsButtonClicked.putExtra("Choose Manufacturer", "MainActivity");
startActivityForResult(SupercarSoundsButtonClicked, result);
}
public void clickedRegisterApplication(View view) {
final int result = 1;
Intent RegisterApplicationButtonClicked = new Intent (this, RegisterApplication.class);
RegisterApplicationButtonClicked.putExtra("Register Application", "MainActivity");
startActivityForResult(RegisterApplicationButtonClicked, result);
}
}
谢谢！
答案 0 :(得分：4)
您需要将<activity>标记放在AndroidManifest.xml中的<application>标记中。