android - 为什么我看不到启动画面？

Question

我有下面的代码，它创建了一个启动画面。当我启动我的应用程序时，我看不到启动屏幕，而是直接看到第一个活动：

public class splash extends Activity {
    private static final int STOPSPLASH = 0;

    //time in milliseconds
    private static final long SPLASHTIME = 13000;

    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);        

        Intent intent = new Intent(this, prima.class);

        splash = (ImageView) findViewById(R.id.imageView1);

        Message msg = new Message();
        msg.what = STOPSPLASH;       

        splashHandler.sendMessageDelayed(msg, SPLASHTIME);        

        startActivity(intent);  
    }
}

Answer 1

你必须startActivity()从你的处理程序那里做。如果你直接这样做，你将直接切换到下一个活动。

public class splash extends Activity {
    private static final int STOPSPLASH = 0;
    // time in milliseconds
    private static final long SPLASHTIME = 13000;
    private Intent nextActivity;

    // handler for splash screen
    private Handler splashHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case STOPSPLASH:
                    // start next Activity
                    startActivity(nextActivity);
                    break;
            }
        }
    };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        nextActivity = new Intent(this, prima.class);
        splashHandler.sendEmptyMessageDelayed(STOPSPLASH, SPLASHTIME);
    }
}