我創(chuàng)建了一個包含 3 個啟動畫面的應用程序。它們在 10 秒后出現并消失，下一個取代它，直到第三個結束，然后主活動打開，應用程序正常運行。問題是，如果用戶在任何這些啟動屏幕期間將應用程序發(fā)送到后臺，則 10 秒后，即使用戶正在使用另一個應用程序，應用程序也會回到前臺并顯示下一個啟動屏幕或主要活動。我查看了代碼，似乎找不到任何可以解釋這一點的內容。在 Android Studio 更新到 3.5 之前它工作正常，我不知道為什么會導致這個問題。public class loadScreen extends AppCompatActivity {private int SLEEP_TIMER = 3;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_load_screen); LogoLauncher logoLauncher = new LogoLauncher(); logoLauncher.start();}private class LogoLauncher extends Thread{ public void run(){ try{ sleep(3000 * SLEEP_TIMER); }catch(InterruptedException e) { e.printStackTrace(); } Intent intent = new Intent(loadScreen.this, createdby.class); startActivity(intent); loadScreen.this.finish(); }}@Overridepublic void onBackPressed() {}}我希望如果應用程序在啟動畫面序列期間在用戶返回時被發(fā)送到后臺，它將從他們離開的地方恢復。
2 回答
Qyouu
TA貢獻1786條經驗 獲得超11個贊
您的問題是即使您的應用程序在后臺，也會調用 startActivity。這將在調用時打開您的應用程序。因此，您需要在該部分中創(chuàng)建一些邏輯來檢查是否允許調用 startActivity 方法。
編輯：用于檢查活動的待啟動的代碼。試試這個！
private static final String PENDING_LAUNCH_KEY = "PENDING_LAUNCH";
private boolean pendingLaunch;
private boolean activityPaused;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
pendingLaunch = savedInstanceState.getBoolean(PENDING_LAUNCH_KEY);
}
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_load_screen);
if (!pendingLaunch) {
LogoLauncher logoLauncher = new LogoLauncher();
logoLauncher.start();
}
}
@Override
protected void onResume() {
activityPaused = false;
if (pendingLaunch) {
pendingLaunch = false;
startAndFinish();
}
}
@Override
protected void onPause() {
activityPaused = true;
}
@Override
public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
outState.putBoolean(PENDING_LAUNCH_KEY, pendingLaunch);
super.onSaveInstanceState(outState, outPersistentState);
}
private class LogoLauncher extends Thread{
public void run(){
try{
sleep(3000 * SLEEP_TIMER);
}catch(InterruptedException e)
{
e.printStackTrace();
}
if (activityPaused) pendingLaunch = true;
else startAndFinish();
}
}
private void startAndFinish() {
Intent intent = new Intent(loadScreen.this, createdby.class);
startActivity(intent);
finish();
}
慕虎7371278
TA貢獻1802條經驗 獲得超4個贊
即使用戶正在使用另一個應用程序，該應用程序也會將自己帶回前臺
即使您的應用程序進入后臺，您的線程仍在運行！解決方案是，您必須在方法中使用terminate該線程onPause
它將從他們離開的地方恢復。
飛濺活動
public class SplashActivity extends AppCompatActivity {
private Handler handler = null;
private long SPLASH_TIMEOUT = 5000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
handler = new Handler();
}
private Runnable splashRunnable = new Runnable() {
@Override
public void run() {
Intent mySuperIntent = new Intent(SplashActivity.this, SplashActivity1.class);
startActivity(mySuperIntent);
finish();
}
};
@Override
protected void onPause() {
super.onPause();
handler.removeCallbacks(splashRunnable);
}
@Override
protected void onResume() {
super.onResume();
handler.postDelayed(splashRunnable, SPLASH_TIMEOUT);
}
}
SplashActivity1與SplashActivity 相同的代碼只會intent發(fā)生變化。
import android.content.Intent;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class SplashActivity1 extends AppCompatActivity {
private Handler handler = null;
private long SPLASH_TIMEOUT = 5000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash1);
handler = new Handler();
}
private Runnable splashRunnable = new Runnable() {
@Override
public void run() {
Intent mySuperIntent = new Intent(SplashActivity1.this,
MainActivity.class);
startActivity(mySuperIntent);
finish();
}
};
@Override
protected void onPause() {
super.onPause();
handler.removeCallbacks(splashRunnable);
}
@Override
protected void onResume() {
super.onResume();
handler.postDelayed(splashRunnable, SPLASH_TIMEOUT);
}
}
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