Open an activity after a certain amount of time?

问题:

I would like to implement a SplashScreen in my app. I found the best and easiest way is to launch an activity that shows a layout with an image view at the launch of the app and then adding android:noHistory="true" attribute to the manifest. Now, how do I set the splashscreen activity to launch the MainActivity class after a certain amount of time? Lets say 2 seconds?

This is my splashscreen activity

public class SplashActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splashscreen);
}
}

回答1:

use

handler.postDelayed(runnable, delayinmilliseconds(2000 in your case));

final Runnable runnable = new Runnable()
{
    public void run() 
    {
       //start the new activity here.
    }
};

回答2:

Here is a complete sample.

package com.test.splash;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.ImageView;

public class splash extends Activity {

    private static final int STOPSPLASH = 0;
    //time in milliseconds
    private static final long SPLASHTIME = 3000;a

    private ImageView splash;

    //handler for splash screen
    private Handler splashHandler = new Handler() {
        /* (non-Javadoc)
         * @see android.os.Handler#handleMessage(android.os.Message)
         */
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case STOPSPLASH:
                //remove SplashScreen from view
                splash.setVisibility(View.GONE);
                break;
            }
            super.handleMessage(msg);
        }
    };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
            splash = (ImageView) findViewById(R.id.splashscreen);
            Message msg = new Message();
            msg.what = STOPSPLASH;
            splashHandler.sendMessageDelayed(msg, SPLASHTIME);
    }
}

回答3:

public class TrackMyMoneyActivity extends Activity {
//member fields
private ProgressBar pbar = null;
private TextView counter_txt = null;
Thread splash_thread = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    pbar = (ProgressBar) findViewById(R.id.splashpbar);
    counter_txt = (TextView) findViewById(R.id.countertxt);
    //define thread
    splash_thread = new Thread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            int i = 0;
              for( i=0;i<100;i++){

                  pbar.setProgress(i);

                 // counter_txt.setText(i+" %");
                  try {
                    splash_thread.sleep(100);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
              }
              if(i==100){
                  Intent intent = new Intent(getBaseContext(), LoginApp.class);
                  startActivity(intent);
              }
        }
    });
    splash_thread.start();

}
@Override
protected void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();


}

}

I hope it will be solved your solution.

回答4:

You can also use java.util.Timer in this way:

new Timer().schedule(new TimerTask(){
    public void run() { 
        startActivity(new Intent(SplashActivity.this, MainActivity.class));
    }
}, 2000 /*amount of time in milliseconds before execution*/ );

回答5:

public class Splashscreen extends Activity 
    {
  private static final int SPLASH_TIME = 10 * 1000;// 3 seconds


  Button logo;
  @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// requestWindowFeature(Window.FEATURE_NO_TITLE);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.splashscreen);
 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    try {
    new Handler().postDelayed(new Runnable() {

        public void run() {

            Intent intent = new     Intent(Splashscreen.this,MainActivity.class);
            startActivity(intent);

            Splashscreen.this.finish();

            //overridePendingTransition(R.anim.fade_in, R.anim.fade_out);

        }


    }, SPLASH_TIME);

    new Handler().postDelayed(new Runnable() {
          public void run() {
                 } 
            }, SPLASH_TIME);
    } catch(Exception e){}
// METHOD 1     

/****** Create Thread that will sleep for 5 seconds *************/        
Thread background = new Thread() {
   public void run() {

       try {
           // Thread will sleep for 5 seconds
           sleep(50*1000);

           // After 5 seconds redirect to another intent
           Intent i=new Intent(getBaseContext(),MainActivity.class);
           startActivity(i);

           //Remove activity
           finish();

       } catch (Exception e) {

         }
       }
     };


     background.start();



      }