Question

我是Android初学者。我已经在SplashScreen内2秒钟内更改了ImageView内的img图片。最后一张图像连续显示两次，以避免在移至MainActivity之前将其破坏。因此，它以某种方式起作用-图片在变化，最后将用户带到MainActivity，那里我只有一个按钮，什么也不做（只是为了让测试对象可见）。从理论上讲一切都很好，但是每8秒钟MainActivity可能会重新加载一次。我可以看到，因为Button在上下移动了1px。

请问一下我的代码并回答为什么？谢谢！

public class SplashScreen extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_splash_screen);
    handler.postDelayed(runnable, 0);

}

@Override
protected void onDestroy() {
    super.onDestroy();
}

int[] imageArraySplashScreen = { R.drawable.pierwszy, R.drawable.drugi, R.drawable.trzeci, R.drawable.trzeci};
Handler handler = new Handler();
Runnable runnable = new Runnable(){
    int i = 0;
    ImageView splashImageView;

    public void run() {
        splashImageView = findViewById(R.id.idSplashScreenImageView);
        splashImageView.setImageResource(imageArraySplashScreen[i]);
        i++;
        if (i>imageArraySplashScreen.length-1){
            i=0;
            Intent splashScreenIntent = new Intent(SplashScreen.this, MainActivity.class );
            startActivity(splashScreenIntent);
            finish();
        }
        handler.postDelayed(this, 2000);
    }
};

}

Answer 1

尝试

handler.removeCallbacks(runnable);

在onPause（）

Answer 2

仅当需要显示图像时才需要发布处理程序。只需更改代码即可，

Handler handler = new Handler();    
Runnable runnable = new Runnable() {
        int i = 0;
        ImageView splashImageView;

        public void run() {

            splashImageView.setImageResource(imageArraySplashScreen[i]);
            i++;
            if (i > imageArraySplashScreen.length - 1) {
                i = 0;
                Intent splashScreenIntent = new Intent(SplashScreen.this, MainActivity.class);
                startActivity(splashScreenIntent);
                finish();
            } else {
                handler.postDelayed(this, 2000);
            }

        }
    };

Android SplashScreen在ImageView中更改图像-为什么要定期重新加载MainActivity？

2 个答案: