Android启动画面启动

Question

I am creating an android app and when I go to debug it on my samsung galaxy the Splash activity loads first,as it should, but after that the app crashes/stops right after doing the "Splash" activity. It doesn't go to the "MainActivity" activity after the thread sleeps for 5 seconds. Does anyone know what might be causing the problem? Plus after I tried debugging the app and loaded it onto my phone the app isn't even showing up. I am using Eclipse by the way. It shows the app in my application manager on my phone but it doesn't show the icon in my app screen.

Here is my Splash.java:

package com.example.mihirsandroidapp;

import android.app.Activity; 
import android.content.Intent;
import android.os.Bundle;

public class Splash extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);
    Thread timer = new Thread(){
        public void run(){
            try{
                sleep(5000);
            } catch (InterruptedException e){
                e.printStackTrace();
            }finally{
                Intent openMainActivity =  new Intent("com.example.mihirandroidsapp.MAINACTIVITY");
                startActivity(openMainActivity);
            }
        }
    };
    timer.start();
}

@Override
protected void onPause() {
    super.onPause();
    finish();
}


}

Here is my Manifest:

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

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="19" />

<application
    android:debuggable="true"
    android:allowBackup="true"
    android:icon="@drawable/cartooncat"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
       <activity
        android:name=".Splash"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.example.mihirsandroidapp.SPLASH" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
        <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.example.mihirsandroidapp.MAINACTIVITY" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
</application>

And here is my main activity which should start after the splash screen:

package com.example.mihirsandroidapp;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

int counter;
Button add, sub;
TextView display;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    counter = 0;
    add = (Button) findViewById(R.id.bAdd);
    sub = (Button) findViewById(R.id.bSub);
    display = (TextView) findViewById(R.id.tvDisplay);
    add.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            counter += 1;
            display.setText("Total is " + counter);


        }
    });
    sub.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            counter -= 1;
            display.setText("Total is " + counter);

        }
    });

}

}

Answer 1

Oh.. Where do I start.. Let's go through all of the issues:

1) Fix your manifest. Definitely not the right way to declare your activities. Here is what it should look like:

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="19" />

<application
    android:debuggable="true"
    android:allowBackup="true"
    android:icon="@drawable/cartooncat"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".Splash"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
    </activity>
</application>

2) Now let's fix the way you start your activity:

Intent openMainActivity =  new Intent(Splash.this, MainActivity.class);

3) Don't call finish() in onPause() - you break native activity lifecycle flow. Call finish() right after you start new activity:

Intent openMainActivity =  new Intent(Splash.this, MainActivity.class);
startActivity(openMainActivity);
finish();

4) Instead of creating separate thread, just a create a Handler and post Runnable there with 5 seconds delay:

Handler handler = new Handler();
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        //this will be called after 5 seconds delay
    }
}, 5000);    

Here is entire file put together:

public class Splash extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);
    Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            Intent openMainActivity =  new Intent(Splash.this, MainActivity.class);
            startActivity(openMainActivity);
            finish();

        }
    }, 5000);    
}

If it doesn't help - we definitely need to look at logcat output...

Answer 2

A simple way to achieve this if one is ready to compromise on drawing performance is to define custom theme with splash image that one wants to use as window background and use this custom theme as application theme

styles.xml

 <resources>
        <style name="CustomTheme" parent="android:Theme">
            <item name="android:windowBackground">@drawable/background_image</item>
            <item name="android:windowNoTitle">true</item>
        </style>
    </resources>

AndroidManifest.xml

   <application
        android:debuggable="true"        
        android:icon="@drawable/icon"
        android:theme="@style/CustomTheme"
        android:label="@string/app_name">
        ...
</application>

This would use the @drawable/background_image as the window.background. As a result if the activities has transparent background then @drawable/background_image will be visible as activities background. One can avoid this by setting appropriate color or drawable in onCreate of every activity programatically as

public void onCreate(){
super.onCreate(savedInstanceState);
setContentView(R.layout.layoutResID);
activity.getWindow().setBackgroundDrawableResource(R.color.window_bg);

}

Check this for more information

Answer 3

All what you need for a splash screen

SplashActivity.java

public class SplashActivity extends AppCompatActivity {

private final int SPLASH_DISPLAY_DURATION = 1000;

@Override
public void onCreate(Bundle bundle) {
    super.onCreate(bundle);


    new Handler().postDelayed(new Runnable(){
        @Override
        public void run() {

            Intent mainIntent = new Intent(SplashActivity.this,MainActivity.class);
            SplashActivity.this.startActivity(mainIntent);
            SplashActivity.this.finish();
        }
    }, SPLASH_DISPLAY_DURATION);
}}

In drawables create this bg_splash.xml

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android">

<item
    android:drawable="@color/app_color"/>

<item>
    <bitmap
        android:gravity="center"
        android:src="@drawable/ic_in_app_logo_big"/>
</item></layer-list>

In styles.xml create a custom theme

<style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
    <item name="android:windowBackground">@drawable/bg_splash</item>
</style>

and finally in AndroidManifest.xml specify the theme to your activity

<activity
        android:name=".activities.SplashActivity"
        android:label="@string/app_name"
        android:screenOrientation="portrait"
        android:theme="@style/SplashTheme">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

Cheers.

Answer 4

  @Override
   protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          Thread th = new Thread(new Runnable() {            /*create a new thread */
                              @Override
                              public void run() { /*
                                                                  * The purpose of this thread is to
                                                                  * navigate from one class to another
                                                                  * after some time
                                                                  */

                                     try {
                                            Thread.sleep(5000);
                                     } catch (InterruptedException e) {
                                            /*
                                             * We are creating this new thread because we don’t
                                             * want our main thread to stop working for that
                                             * time as our android stop working and some time
                                             * application will crashes
                                             */
                                            e.printStackTrace();
                                     }
                                     finally {
                                            Intent i = new Intent(MainActivity.this,
                                                          Splash_Class.class);
                                            startActivity(i);
                                            finish();
                                     }
                              }
                       });
          th.start(); // start the thread
   }

http://www.codehubb.com/android_splash_screen

Answer 5

I have added splash screen by using following code:

public class SplashActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.splash_layout);
        initConstatnts();// method for intilizing any constants

        new Thread(new Runnable() {

            @Override
            public void run() {

                if (!isFinishing()) // checking activity is finishing or not
                {
                    try {
                        Thread.sleep(3000);//delay

                        Intent i = new Intent(getBaseContext(),
                                HomeActivity.class);
                        startActivity(i);

                        finish();
                    } 
                    catch (InterruptedException e) 
                    {
                        e.printStackTrace();
                    }
                }
            }

        }).start();

    }

    private void initConstatnts() {

    }
}

Answer 6

public class SplashScreen extends Activity 
 {
  private static int SPLASH_TIME_OUT = 2000;

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

  new Handler().postDelayed(new Runnable() {

@Override
 public void run() {

 Intent i = newIntent(SplashScreen .this, FirstActivity.class);

      startActivity(i);

      overridePendingTransition(R.anim.abc_fade_in,R.anim.abc_fade_in);


     finish();
  }
  }, SPLASH_TIME_OUT);
}

 }

For more reference click here http://androiddhina.blogspot.in/2015/05/android-splash-screen-example.html

Answer 7

Flow the below steps to Create your own splash screen

1. Create Activity1 and XML file
2. Design the XML file and put the welcome message
3. Crete Activity2 and XML file.
4. Start the Activity1
5. Start a Thread in Activity1 and sleep for 5 seconds
6. Start Activity2 from the Thread

There is nothing called readymade splash screen in Android . we can achieve that using above steps.

In a single line, start Activity1 wait for 5 sec then start Activity2.

So user will feel that first screen is splash screen.

You can download the complete code from below link

http://javaant.com/splash-screen-android/#.VwzHz5N96Hs

Answer 8

i have faced the same problem.... i think you code is perfect for the app

u just try with this in the Intent Creation in your splash activity class

Intent openMainActivity = new Intent("android.intent.action.MAIN");//MAIN is the that u want to start //next after the current Activity