非常奇怪的异常，4.4中的IndexOutOfBoundsException但在5.0中运行良好：Android

Question

详细，

我有 A类，并且在那个班级我有

  public static ArrayList<String> video_title = new ArrayList<String>();

和 video_title的所有值都在A类中填充

我要从A类来到 B类并以A.video_title.get（索引）的身份访问ArrayList ..好吧这样可以正常工作..

现在出现了真正的问题， 我正在从B类链接打开Android默认Web视图，当我回到我的Activity时（显然当我从Web视图按回来打开我的上一个活动类B）时，它会给IndexOutOfBoundsException并说Invalid index 2, size is 0. 1}}

更奇怪的是，它在Android 4.4.4中出错但在

中工作正常

Android 5.0.2

我的两个类的代码如下（我只分享必要的代码，因为我的应用程序有一些敏感的代码），

A类：

public class A extends Activity{

public static ArrayList<String> video_title = new ArrayList<String>();

@Override
protected void onCreate(Bundle savedInstanceState)
{
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.list_of_video);


    new AsyncTask<Void, Void, Void>()
    {


        protected void onPreExecute()
        {
            video_title.clear();

        };

        @Override
        protected Void doInBackground(Void... params)
        {
            // TODO Auto-generated method stub

            try
            {
                JSONObject obj = Handle_json.HTTPGet(“here is my url from data is come“);

                nextPageToken = obj.getString("nextPageToken");

                JSONArray items = obj.getJSONArray("items");

                for (int i = 0; i < items.length(); i++)
                {

                    JSONObject jobj = items.getJSONObject(i);

                    video_title.add("" + omg.getString("title"));

                }

            }
            catch (Exception e)
            {
                e.printStackTrace();
            }

            return null;
        }

        protected void onPostExecute(Void result)
        {
            pDialog.dismiss();

        };

    }.execute();

}



@Override
public void onBackPressed()
{
    // TODO Auto-generated method stub
    super.onBackPressed();
    overridePendingTransition(R.drawable.in2, R.drawable.out2);
  }
 }

B组：

public class B extends YouTubeFailureRecoveryActivity implements OnFullscreenListener{

TextView video_detail_title, video_detail_title2, video_detail_views,
    like_count, dislike_count, video_detail_desc;
ImageView video_detail_iv;

ProgressBar video_detail_pb;

int position = 0;

RelativeLayout main_content;

private View videoBox;
private View closeButton;
YouTubePlayerView youTubeView;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.video_detail);

    final Bundle bundle = getIntent().getExtras();
    position = bundle.getInt("position");

    main_content = (RelativeLayout) findViewById(R.id.main_content);

    videoBox = findViewById(R.id.video_box);
    closeButton = findViewById(R.id.close_button);
    videoBox.setVisibility(View.INVISIBLE);

    closeButton.setOnClickListener(new OnClickListener()
    {

        @Override
        public void onClick(View v)
        {
            // TODO Auto-generated method stub
            onClickClose();
        }
    });

    findViewById(R.id.video_detail_iv).setOnClickListener(new OnClickListener()
    {

        @Override
        public void onClick(View v)
        {
            // TODO Auto-generated method stub
            if (videoBox.getVisibility() != View.VISIBLE)
            {
                if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)
                {
                    // Initially translate off the screen so that it can be animated in from below.
                    videoBox.setTranslationY(videoBox.getHeight());
                }
                videoBox.setVisibility(View.VISIBLE);
            }

            // If the fragment is off the screen, we animate it in.
            if (videoBox.getTranslationY() > 0)
            {
                videoBox.animate().translationY(0).setDuration(300);
            }

        }
    });


    youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_view);
    youTubeView.initialize(DeveloperKey.DEVELOPER_KEY, this);

    video_detail_title = (TextView) findViewById(R.id.video_detail_title);
    video_detail_title.setText("" + A.video_title.get(position));


}

@Override
public void onBackPressed()
{
    // TODO Auto-generated method stub
    super.onBackPressed();
    overridePendingTransition(R.drawable.in2, R.drawable.out2);
}

@Override
public void onInitializationSuccess(Provider arg0, YouTubePlayer arg1, boolean arg2)
{
    // TODO Auto-generated method stub
    if (!arg2)
    {
        arg1.cueVideo(Show_List_Of_Video.video_id.get(position));
    }
}

@Override
protected Provider getYouTubePlayerProvider()
{
    // TODO Auto-generated method stub
    return (YouTubePlayerView) findViewById(R.id.youtube_view);
}

private boolean isFullscreen;

@Override
public void onFullscreen(boolean arg0)
{
    // TODO Auto-generated method stub
    this.isFullscreen = arg0;

    closeButton.setVisibility(isFullscreen ? View.GONE : View.VISIBLE);
    if (isFullscreen)
    {
        videoBox.setTranslationY(0);

    }

}

public void onClickClose()
{
    ViewPropertyAnimator animator = videoBox.animate().translationYBy(videoBox.getHeight()).setDuration(300);
    runOnAnimationEnd(animator, new Runnable()
    {
        @Override
        public void run()
        {
            videoBox.setVisibility(View.INVISIBLE);
        }
    });
}

@TargetApi(16)
private void runOnAnimationEnd(ViewPropertyAnimator animator, final Runnable runnable)
{
    if (Build.VERSION.SDK_INT >= 16)
    {
        animator.withEndAction(runnable);
    }
    else
    {
        animator.setListener(new AnimatorListenerAdapter()
        {
            @Override
            public void onAnimationEnd(Animator animation)
            {
                runnable.run();
            }
        });
    }
  }

 }

后添加：

我发现当我回到活动B时，所有活动的所有变量都被清除了。为什么会发生这种情况？甚至我将变量声明为静态。出了什么问题？

Answer 1

当你通过移除你的arraylist Pause你的活动android kitkat 4.4.4释放内存。您可以声明静态arraylist以避免此问题。或者在onPause保存偏好设置中的arraylist并加载回onResume。