如何在 postDelayed 中使用 Intent - Android

Question

This is for a splash screen. I've followed the tutorial but it's still not working. It keeps on getting error for some reason. I've tried everything that I know but it still doesn't work. Please help.

This is my code:

package id.ac.umn.finalproject;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;

public class MainActivity extends AppCompatActivity {

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

        Intent startApp = new Intent(MainActivity.this, PemasukanActivity.class);

        new Handler().postDelayed(startActivity(startApp), 3000);
    }
}

Answer 1

In Kotlin Try This

Handler(Looper.getMainLooper()).postDelayed({ Intent startApp = new Intent(MainActivity.this, PemasukanActivity.class); startActivity(startApp) }, 3000)

Answer 2

Try this...

 `int SPLASH_TIME_OUT = 3000;
    /*
     * Showing splash screen with a timer. This will be useful when you
     * want to show case your app logo / company
     */
    new Handler().postDelayed(() -> {
        // This method will be executed once the timer is over
        // Start your app main activity
        Intent i = new Intent(SplashScreenActivity.this, HomeActivity.class);
        startActivity(i);

        // close this activity
        finish();
    }, SPLASH_TIME_OUT);`   

Answer 3

The correct way to create a Splash screen is as follows

style.xml

 <style name="SplashStyle" parent="Theme.MaterialComponents.DayNight.NoActionBar">
        <item name="android:windowBackground">@drawable/splash</item>
    </style>

Splash.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@color/black" /> // background color

    <item
        android:drawable="@drawable/ic_launcher" /> // logo
        android:gravity="center" />

</layer-list>

Manifest

<activity
            android:name=".SplashActivity"
            android:exported="true"
            android:noHistory="true"
            android:theme="@style/SplashStyle">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

        </activity>

SplashActivity.java

public class SplashActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_splash); // No need setContentView
        
        Intent intent = new Intent(SplashActivity.this,MainActivity.class);
        startActivity(intent);
    }

Answer 4

You're almost using postDelayed(Runnable, long) correctly, but just not quite. Let's take a look at your Runnable.

final Runnable r = new Runnable() {
    public void run() {
        
       Intent startApp = new Intent(MainActivity.this, PemasukanActivity.class);
       handler.postDelayed(startActivity(startApp), 3000);
    }
};

When we call r.run(); the first thing it's going to do is tell your handler to run the very same Runnable after 3000 milliseconds , and then to call startApp. What this will actually result in is your startApp. being called twice: once right away, and a second time once the Handler is done waiting 3000 milliseconds.

Instead, you should change your Runnable to this:

final Runnable r = new Runnable() {
    public void run() {
         Intent startApp = new Intent(MainActivity.this, PemasukanActivity.class);
    }
};

And call it like this:

handler.postDelayed(r, 3000);

---