Android 在启动画面中按下主页按钮几秒钟后应用打开

Android app opens after a few seconds after pressing home button during splash screen

我遇到了一个问题,我似乎无法找出原因。

当您启动该应用程序时,启动画面会先显示 2.5 秒,然后才能完成并开始新的 activity。如果您在此期间按主页或后退按钮,应用程序将正常关闭。但是,几秒钟后(超过 2.5),应用程序将打开并从启动画面后的 activity 开始。

如能提供任何关于为什么会发生这种情况的帮助,我们将不胜感激!

这是启动画面的实现(但是我不相信这里有任何东西会导致这个问题,因为我尝试了不同的实现)

`public class SplashScreenActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash_screen);

    Thread myThread = new Thread(){
        @Override
        public void run() {
            try {
                sleep(2500);
                Intent intent = new Intent(getApplicationContext(),MainActivity.class);
                startActivity(intent);
                finish();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    };
    myThread.start();` 

这是清单

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.VIBRATE" />
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".activities.MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar"
        android:launchMode = "singleInstance">
    </activity>
    <activity android:name=".activities.SplashScreenActivity"
        android:theme="@style/Theme.AppCompat.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <receiver android:name=".alert.BroadCaster" >
    </receiver>
    <service android:name=".timer.TimerService"
        android:process=":timerservice" />
</application>

发生这种情况是因为您正在创建一个新的 Thread,并且在您将您的应用程序置于后台后该线程仍然存在。您可以使用 Handler 更改您的方法。如果您需要下一个 Activity 在初始屏幕处于后台时不会启动,则必须在延迟开始之前存储当前时间。

private static final long SPLASH_SCREEN_MS = 2500;

private long mTimeBeforeDelay;
private Handler mSplashHandler;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash_screen);
    // Create a new Handler.
    mSplashHandler = new Handler();
}

@Override
protected void onResume() {
    super.onResume();
    // The first time mTimeBeforeDelay will be 0.
    long gapTime = System.currentTimeMillis() - mTimeBeforeDelay;
    if (gapTime > SPLASH_SCREEN_MS) {
        gapTime = SPLASH_SCREEN_MS;
    }
    mSplashHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            Intent intent = new Intent(SplashScreenActivity.this, MainActivity.class);
            startActivity(intent);
            SplashScreenActivity.this.finish();
        }
    }, gapTime);
    // Save the time before the delay.
    mTimeBeforeDelay = System.currentTimeMillis();
}

@Override
protected void onPause() {
    super.onPause();
    mSplashHandler.removeCallbacksAndMessages(null);
}

像这样使用处理程序而不是线程睡眠

new Handler().postDelayed(new Runnable(){
            @Override
            public void run() {
                Intent intent = new Intent(SplashScreenActivity.this, MainActivity.class);
                startActivity(intent);
                SplashScreenActivity.this.finish();
            }
        }, SPLASH_DURATION);

你需要实现onStop()方法,只有当你想保存数据和内存时。