java - Android:加载应用程序时添加动画

Question

我有一个动画，每当单击 ImageButton 时都会在它上产生一个小的“弹出”效果:

<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"
android:fromXScale="0.9"
android:toXScale="1.05"
android:fromYScale="0.9"
android:toYScale="1.05"
android:pivotX="50%"
android:pivotY="50%"
android:duration="180"
/>

我该如何修复它，以便在加载应用程序时启动动画一次，只是为了“显示 ImageButton 是可点击的”？

这是 ImageButton 代码:

    final ImageButton a = (ImageButton) findViewById(R.id.imageNew);
    a.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        Animation anim = AnimationUtils.loadAnimation(MainActivity.this, R.anim.animation);
        a.startAnimation(anim);

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

Answer 1

您无法在 oncreate 中运行动画，因为它尚未附加到 View ，因此要运行启动动画，请重写此方法。

  @Override
            public void onWindowFocusChanged(boolean hasFocus) {
                RunAnimations();
                super.onWindowFocusChanged(hasFocus);
            }

在你的 xml 动画中试试这个

android:repeatCount="0"

我不确定您是否需要设置 oneshot 进行缩放，但我的一次性启动动画列表如下所示:

<animation-list xmlns:android="http://schemas.android.com/apk/res/android" 
    android:oneshot="true">

    <item android:drawable="@drawable/artsun" android:duration="100"/>
   <item android:drawable="@drawable/artsun2" android:duration="100"/>
   <item android:drawable="@drawable/artsun3" android:duration="100"/>
   <item android:drawable="@drawable/artsun4" android:duration="100"/>


</animation-list>

Android 文档明确指出要使用覆盖上述方法的启动动画，而不是 ONSTART() 或 ONCREATE()!

@Override
            public void onWindowFocusChanged(boolean hasFocus) {
                RunAnimations();
                super.onWindowFocusChanged(hasFocus);
            }                

                                                         can go anywhere in your main activity, then just create the run animations method and in it put anything you want to start              

    private void RunAnimations() {


   Animation   a = AnimationUtils.loadAnimation(this, R.anim.fade);
  /*  a.reset();
    logoImage = (ImageView) findViewById(R.id.dopescrawl);
    logoImage.setBackgroundResource(R.drawable.dopesplash);
    logoAnimation = (AnimationDrawable)  logoImage.getBackground();
    logoImage.clearAnimation();
    logoImage.startAnimation(a);
    */
    a = AnimationUtils.loadAnimation(this, R.anim.slide);
    a.reset();
    ImageView title = (ImageView) findViewById(R.id.dopescrawl);
    title.clearAnimation();
    title.startAnimation(a);





    //logoAnimation.start();
}

全类如下

public class Splash extends Activity {
    /** Called when the activity is first created. */
//MediaPlayer mpSplash;
    AnimationDrawable logoAnimation;
     ImageView logoImage;
ProgressBar  progressBar1;
View ticker;
ImageView gplay;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.splash);
        progressBar1=(ProgressBar)findViewById(R.id.progressBar1);
        progressBar1.setVisibility(View.INVISIBLE);
        gplay=(ImageView) findViewById(R.id.gplay);
        ticker = (View) findViewById(R.id.ticker);

        ticker.setFocusable(true);
        ticker.requestFocus();
        ticker.setSelected(true);
        this.gplay.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=com.gmaninc.dopewars"));
                startActivity(browserIntent);
            }
        });


    }

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

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

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

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

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

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        RunAnimations();
        super.onWindowFocusChanged(hasFocus);
    }
    private void RunAnimations() {


       Animation   a = AnimationUtils.loadAnimation(this, R.anim.fade);
      /*  a.reset();
        logoImage = (ImageView) findViewById(R.id.dopescrawl);
        logoImage.setBackgroundResource(R.drawable.dopesplash);
        logoAnimation = (AnimationDrawable)  logoImage.getBackground();
        logoImage.clearAnimation();
        logoImage.startAnimation(a);
        */
        a = AnimationUtils.loadAnimation(this, R.anim.slide);
        a.reset();
        ImageView title = (ImageView) findViewById(R.id.dopescrawl);
        title.clearAnimation();
        title.startAnimation(a);





        //logoAnimation.start();
    }
 @Override
public boolean onTouchEvent(MotionEvent event) {
    progressBar1.setVisibility(View.VISIBLE);
    progressBar1.setIndeterminate(true);
            startActivity(new Intent("com.gmaninc.dopewarsfree.MG"));

    return super.onTouchEvent(event);
}
    }