android – 在ViewPager中滑动到新页面会导致旧页面丢失状态

概述我的viewpager中有3页.每个页面都有一个按钮,最初设置为一个开始按钮.按下开始按钮后,它将变为暂停按钮.我的问题是,如果我在第一页并单击开始(将其更改为暂停),然后滚动到最后一页并返回到第一页,则按钮会再次开始.它已经失去了被压迫的状态.这只发生在滚动两页之后.如果只滚动一页然后再返回,它不会丢失状态. public Object instantiateItem(ViewGroup col 我的vIEwpager中有3页.每个页面都有一个按钮,最初设置为一个开始按钮.按下开始按钮后,它将变为暂停按钮.我的问题是,如果我在第一页并单击开始(将其更改为暂停),然后滚动到最后一页并返回到第一页,则按钮会再次开始.它已经失去了被压迫的状态.这只发生在滚动两页之后.如果只滚动一页然后再返回,它不会丢失状态.

public Object instantiateItem(VIEwGroup collection,int position) {        relativeLayout wholeVIEw = new relativeLayout(collection.getContext());            // images            final ImageVIEw workoutWidget = new ImageVIEw(collection.getContext());            workoutWidget.setimageResource(R.drawable.workout_Widget_master);            final Imagebutton resetbutton = new Imagebutton(collection.getContext());            resetbutton.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.reset_button_master));            relativeLayout.LayoutParams resetbuttonParams = new relativeLayout.LayoutParams(relativeLayout.LayoutParams.WRAP_CONTENT,relativeLayout.LayoutParams.WRAP_CONTENT);            resetbuttonParams.addRule(relativeLayout.AliGN_PARENT_left);            resetbuttonParams.addRule(relativeLayout.AliGN_PARENT_BottOM);            resetbuttonParams.height = 150;            resetbuttonParams.wIDth = 150;            resetbutton.setLayoutParams(resetbuttonParams);            resetbutton.setVisibility(VIEw.GONE);            final Imagebutton startbutton = new Imagebutton(collection.getContext());            startbutton.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.start_button_master));            startbutton.setTag(context.getString(R.string.wtrStartbuttonTag));            relativeLayout.LayoutParams startbuttonParams = new relativeLayout.LayoutParams(relativeLayout.LayoutParams.WRAP_CONTENT,relativeLayout.LayoutParams.WRAP_CONTENT);            startbuttonParams.addRule(relativeLayout.AliGN_PARENT_RIGHT);            startbuttonParams.addRule(relativeLayout.AliGN_PARENT_BottOM);            startbuttonParams.height = 150;            startbuttonParams.wIDth = 150;            startbutton.setLayoutParams(startbuttonParams);            startbutton.setonClickListener(new VIEw.OnClickListener() {                @OverrIDe                public voID onClick(VIEw vIEw) {                    startbutton.setAlpha(1.0f);                    if (startbutton.getTag() == context.getString(R.string.wtrStartbuttonTag)) {                        startbutton.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.pause_button_master));                        startbutton.setTag(context.getString(R.string.wtrPausebuttonTag));                        resetbutton.setVisibility(VIEw.VISIBLE);                    }                    else if (startbutton.getTag() == context.getString(R.string.wtrPausebuttonTag)) {                        startbutton.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.start_button_master));                        startbutton.setTag(context.getString(R.string.wtrStartbuttonTag));                    }                }            });            // text labels vIEw            linearLayout textLabels = new linearLayout(collection.getContext());            textLabels.setorIEntation(linearLayout.VERTICAL);                TextVIEw activityDescription = new TextVIEw(collection.getContext());                activityDescription.setText("warm-up");                activityDescription.setpadding(200,200,0);                activityDescription.setTextSize(30);                textLabels.addVIEw(activityDescription);                TextVIEw timeleftForThisActivity = new TextVIEw(collection.getContext());                timeleftForThisActivity.setText("00:00");                timeleftForThisActivity.setpadding(200,0);                timeleftForThisActivity.setTextSize(60);                textLabels.addVIEw(timeleftForThisActivity);                linearLayout elapsedLabels = new linearLayout(collection.getContext());                elapsedLabels.setorIEntation(linearLayout.HORIZONTAL);                    TextVIEw elapsedtimeStatic = new TextVIEw(collection.getContext());                    elapsedtimeStatic.setText("Elapsed Time: ");                    elapsedtimeStatic.setpadding(200,0);                    elapsedtimeStatic.setTextSize(20);                    TextVIEw elapsedtimeDynamic = new TextVIEw(collection.getContext());                    elapsedtimeDynamic.setText("00:00");                    elapsedtimeDynamic.setpadding(0,0);                    elapsedtimeDynamic.setTextSize(20);                elapsedLabels.addVIEw(elapsedtimeStatic);                elapsedLabels.addVIEw(elapsedtimeDynamic);            textLabels.addVIEw(elapsedLabels);        // adding images and text to overall vIEw        wholeVIEw.addVIEw(workoutWidget);        wholeVIEw.addVIEw(startbutton);        wholeVIEw.addVIEw(resetbutton);        wholeVIEw.addVIEw(textLabels);    collection.addVIEw(wholeVIEw,0);    return wholeVIEw;}

解决方法 它失去了状态,因为vIEwpager默认只保存上一页和下一页(屏幕外页面限制为1).如果滚动到最后一页,则第一页将被销毁.

你可以使用setoffscreenPagelimit(2)增加内存中保存的页数;

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