Android App內(nèi)存圖片優(yōu)化的方法:1、將Activity中的小圖片和背景合并;2、不要在Activity的主題中為Activity設(shè)置默認(rèn)的背景圖片;3、對(duì)于在需要時(shí)才顯示的圖片或者布局,可以使用ViewStub標(biāo)簽。
Android App內(nèi)存怎么優(yōu)化?
Android App內(nèi)存優(yōu)化之圖片優(yōu)化
不要將Button的背景設(shè)置為selector
在布局文件和代碼中,都可以為Button設(shè)置background為selector,這樣方便實(shí)現(xiàn)按鈕的正反選效果,但實(shí)際跟蹤發(fā)現(xiàn),如果是將Button的背景設(shè)置為selector,在初始化Button的時(shí)候會(huì)將正反選圖片都加載在內(nèi)存中(具體可以查看Android源碼,在類Drawable.java的createFromXmlInner方法中對(duì)圖片進(jìn)行解析,最終調(diào)用Drawable的inflate方法),相當(dāng)于一個(gè)按鈕占用了兩張相同大小圖片所使用的內(nèi)存,如果一個(gè)界面上按鈕很多或者是按鈕很大,光是按鈕占用的內(nèi)存就會(huì)很大,可以通過在布局文件中給按鈕只設(shè)置正常狀態(tài)下的背景圖片,然后在代碼中監(jiān)聽按鈕的點(diǎn)擊狀態(tài),當(dāng)按下按鈕時(shí)為按鈕設(shè)置反選效果的圖片,抬起時(shí)重新設(shè)置為正常狀態(tài)下的背景。
如果你覺得為一個(gè)按鈕提供正反選兩張圖片會(huì)導(dǎo)致APK的體積變大,可以通過如下方式實(shí)現(xiàn)按鈕點(diǎn)擊的反選效果,這種方式既不會(huì)存在Button占用兩倍內(nèi)存的情況,又減小了APK的體積(Android 5.0中的tintColor也可以實(shí)現(xiàn)類似的效果):
ImageButton personalInfoBtn = (ImageButton)findViewById(R.id.personalBtnId); personalInfoBtn.setOnTouchListener(new OnTouchListener() { @SuppressLint("ClickableViewAccessibility") @Override public boolean onTouch(View v, MotionEvent event) { int action = event.getAction(); if(action == MotionEvent.ACTION_DOWN){ ((ImageButton)v).setColorFilter(getResources().getColor(0X50000000)); }else if(action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL){ ((ImageButton)v).clearColorFilter(); } // 為了不影響監(jiān)聽按鈕的onClick回調(diào),返回值應(yīng)為false return false; } });
其它優(yōu)化方式
1、盡量將Activity中的小圖片和背景合并,一張小圖片既浪費(fèi)布局的時(shí)間,又平白地增加了內(nèi)存占用;
2、不要在Activity的主題中為Activity設(shè)置默認(rèn)的背景圖片,這樣會(huì)導(dǎo)致Activity占用的內(nèi)存翻倍;
3、對(duì)于在需要時(shí)才顯示的圖片或者布局,可以使用ViewStub標(biāo)簽,通過sdk/tools目錄下的hierarchyviewer.bat查看布局文件會(huì)發(fā)現(xiàn),使用viewstub標(biāo)簽的組件幾乎不消耗布局的時(shí)間,在代碼中當(dāng)需要顯示時(shí)再去實(shí)例化有助于提高Activity的布局效率和節(jié)省Activity消耗的內(nèi)存。
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注意:如果使用到WebView、視頻播放、手寫、動(dòng)畫等功能時(shí),關(guān)掉硬件加速會(huì)嚴(yán)重音效程序的運(yùn)行效率,這種情況可以只關(guān)閉掉Activity中某些view的硬件加速,整個(gè)Activity的硬件加速不關(guān)閉。
??? 如果Activity中某個(gè)View需要關(guān)閉硬件加速,但整個(gè)Activity不能關(guān)閉,可以調(diào)用view層級(jí)關(guān)閉硬件加速的方法:
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