Run Time Main Activity not come after Splash Activity and app close

Question

Everything in my code looks good in both the .java and .xml files (according to the software) because I have no errors yet every time I click the app icon in the emulator, it brings up the splash screen then the app exits without showing my main activity. Here's my code so far:

SplashActivity.java

public class SplashActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //hide title bar of activity
    getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    //Making activity full screen
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_splash);

    int t =3000; //time for spash screen 3000 means 3sec
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {

            startActivity(new Intent(SplashActivity.this, MainActivity.class));
        }
    },t);
}

}

SplashActivity.xml

<ImageView
    android:layout_width="250dp"
    android:layout_height="250dp"
    android:src="@drawable/icon"
    android:text="Hello World!"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

MainActivity.java:

public class MainActivity extends AppCompatActivity
    {

String webAdress ="https://www.google.com/";
WebView webView;
FrameLayout frameLayout;
ProgressBar progressBar;

@Override
protected void onCreate(Bundle savedInstanceState) {


    super.onCreate(savedInstanceState);
    webView = (WebView) findViewById(R.id.webView);
    frameLayout = (FrameLayout) findViewById(R.id.frameLayout);
    progressBar = (ProgressBar) findViewById(R.id.progressBar);

    webView.setWebViewClient(new HelpClient());
    webView.setWebChromeClient(new WebChromeClient() {
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            frameLayout.setVisibility(View.VISIBLE);
            progressBar.setProgress(newProgress);
            setTitle("Loading...");  //when url is loading set this on actionbar
            if (newProgress == 100) {
                frameLayout.setVisibility(View.GONE); // Hide progress bar when page is loaded
                setTitle(view.getTitle()); //get amd set title of opend page
            }
            super.onProgressChanged(view, newProgress);
        }
    });

    webView.getSettings().setJavaScriptEnabled(true); //enable javaScript

    //check internet connection
    if (haveNetworkConnection()) {
        webView.loadUrl(webAdress);
    } else {

        Toast.makeText(this, "No internet Connection", Toast.LENGTH_SHORT).show();
    }
    progressBar.setProgress(0);

}




private class HelpClient extends WebViewClient {

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        frameLayout.setVisibility(View.VISIBLE);
        return true;
    }
}

private boolean haveNetworkConnection(){
    boolean haveConnectedWifi = false;
    boolean haveConnectedMobile = false;

    ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo[] networkInfos = cm.getAllNetworkInfo();

    for(NetworkInfo ni : networkInfos){
        if(ni.getTypeName().equalsIgnoreCase("WIFI"))
            if (ni.isConnected())
                haveConnectedWifi = true;

        if(ni.getTypeName().equalsIgnoreCase("MOBILE"))
            if (ni.isConnected())
                haveConnectedMobile = true;


    }
    return haveConnectedWifi || haveConnectedMobile;
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    //check if the event was the back button and if there's history
    if ((keyCode==KeyEvent.KEYCODE_BACK) && webView.canGoBack()){
        webView.goBack();
        return true;
    }

    //if it was the back or there is no web page history, bubble up to the default system behaviour
    return super.onKeyDown(keyCode, event);
}

}

MainActivity.xml:

<!--Progressbar-->
<FrameLayout
    android:id="@+id/frameLayout"
    android:layout_width="match_parent"
    android:layout_height="3dip"
    android:background="@android:color/transparent">
    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="match_parent"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_height="7dp"
        android:layout_gravity="top"
        android:layout_marginTop="-3dp"
        android:progressDrawable="@drawable/custom_progress"
        android:background="@android:color/transparent"
        android:progress="20"/>
</FrameLayout>

<!--WebView-->
<WebView
    android:id="@+id/webView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1">
</WebView>

Here's my manifest.xml:

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<!--internet permision-->
<uses-permission android:name="android.permission.INTERNET"/>

<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=".SplashActivity"
        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>
    <activity
        android:name=".MainActivity">

    </activity>

</application>

Any hints would be greatly appreciated, thank you!

Answer 1

The problem is in onCreate method of MainActivity, you do not provide any UI (xml layout file), as a result, the app cannot find view elements to init, set listeners, etc. I guess you can find an exception in logcat when your app close.

Solution: Provide a layout xml file for MainActivity

public class MainActivity extends AppCompatActivity {

    String webAdress ="https://www.google.com/";
    WebView webView;
    FrameLayout frameLayout;
    ProgressBar progressBar;

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

        webView = (WebView) findViewById(R.id.webView);
        ...
    }
}

Answer 2

Your code is not so good. If you want to show splashscreen only when app start I recommend using the following code:

AndroidManifest.xml

<activity android:name=".view_layer.activities.SplashScreenActivity"
    android:theme="@style/SplashTheme">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

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

styles.xml

<style name="SplashTheme" parent="@android:style/Theme.NoTitleBar.Fullscreen">
    <item name="android:windowBackground">@drawable/splash</item>
</style>

SplashscreenActivity.java

public class SplashscreenActivity extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        startActivity(new Intent(this, MainActivity.class));
        finish();
    }
}

More: https://android.jlelse.eu/the-complete-android-splash-screen-guide-c7db82bce565

Answer 3

try use

Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
        finish();