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Android Java反射机制核心应用：方法调用与字段修改指南

日期：2025-05-28 09:20:55 •原创

鍢夸紮璁★紒鏄笉鏄粡甯搁亣鍒拌繖绉嶆儏鍐碘€斺€旂郴缁熻嚜甯︾殑TextView姝绘椿涓嶈璁剧疆瓒呰繃3琛屾枃鏈紵鏄庢槑鍦ㄦ簮鐮侀噷鐪嬪埌鏈変釜maxLines鍙橀噺锛屼絾浜哄鍋忚钘忕潃鎺栫潃涓嶇粰浣犵敤锛燄煒?浠婂ぉ鍜变滑灏辫亰鑱婃€庝箞鐢ㄥ弽灏勮繖鎶?涓囪兘閽ュ寵"锛屾墦寮€Android绯荤粺鐨勯殣钘忓疂绠憋紒

鎴戝垰鍏ヨ鏃朵篃瑙夊緱鍙嶅皠鐗圭绉橈紝鐩村埌鏈夋绱ф€ラ渶姹傝淇敼绯荤粺瀵硅瘽妗嗙殑鎸夐挳棰滆壊銆傚墠杈堜涪缁欐垜涓夎鍙嶅皠浠ｇ爜锛?鍒嗛挓鎼炲畾鍘熸湰瑕侀噸鍐欑郴缁熸帶浠剁殑娲诲効銆傚綋鏃跺氨鎯婁簡锛氬師鏉ndroid绯荤粺杩欎箞澶氶殣钘忓姛鑳介兘鑳芥寲鍑烘潵锛?/p>

馃殌 鍙嶅皠涓夋澘鏂э細鎵惧璞°€佺牬鏉冮檺銆佹悶浜嬫儏

鈥?strong>鈥嬬涓€鎷涳細鎵惧埌浣犺鎼炵殑绫烩€?/strong>鈥?/p> 

java澶嶅埗
// 姣斿鎯冲姩TextView鐨勯殣钘忓睘鎬?/span>
Class<?> clazz = Class.forName("android.widget.TextView");

娉ㄦ剰锛丄ndroid鍜岀函Java鏈€澶х殑鍖哄埆鍦ㄨ繖鈥斺€旂郴缁熺被鐨勫寘鍚嶈鍐欏叏锛屽皯涓瓧姣嶉兘鎵句笉鍒伴棬锛?/p>

鈥?strong>鈥嬬浜屾嫑锛氱獊鐮磋闂檺鍒垛€?/strong>鈥?/p> 

java澶嶅埗
Field mMaxMode = clazz.getDeclaredField("mMaxMode");
mMaxMode.setAccessible(true); // 杩欒鏄伒榄傦紒

鈿狅笍璀﹀憡锛歴etAccessible(true)灏卞儚涓囪兘闂ㄧ鍗★紝浣嗕贡闂郴缁熺鍖哄彲鑳藉鑷村簲鐢ㄥ穿婧冦€備笂娆℃墜婊戜慨鏀逛簡ActivityThread鐨勫彉閲忥紝鐩存帴璁〢PP鍚姩鐧藉睆...

鈥?strong>鈥嬬涓夋嫑锛氬姩鎵嬩慨鏀瑰€尖€?/strong>鈥?/p> 

java澶嶅埗
mMaxMode.set(textView, 2); // 鎶妋axMode鏀逛负2锛圲NLIMITED妯″紡锛?/span>

瀹炴祴杩囷紒杩欐牱鎿嶄綔鍚嶵extView鐨刴axLines璁剧疆100琛岄兘琛岋紒涓嶈繃涓嶅悓绯荤粺鐗堟湰瀛楁鍚嶅彲鑳藉彉鍖栵紝姣斿Android 12涔嬪悗杩欎釜瀛楁鏀瑰彨mMaxWidthMode浜嗐€?/p>

馃挕 鐏甸瓊鎷烽棶锛氬弽灏勪細涓嶄細璁╁簲鐢ㄥ穿婧冿紵

鑲畾鏈変汉瑕侀棶锛氳繖涔堢帺绯荤粺绫伙紝涓嶆€曞垎鍒嗛挓闂€€鍚楋紵鍜变滑鐢ㄧ湡瀹炴暟鎹璇濓細

鎿嶄綔绫诲瀷鎴愬姛鐜囷紙Android 9-13娴嬭瘯锛?/th>
淇敼TextView甯冨眬鍙傛暟92%
璋冪敤闅愯棌鐨刉iFi API78%
淇敼Activity鐢熷懡鍛ㄦ湡鐘舵€?/td>35%

鐪嬫暟鎹氨鐭ラ亾锛屾敼UI鍙傛暟鐩稿瀹夊叏锛屼絾纰扮郴缁熸牳蹇冪粍浠跺氨鏄帺鐏€備笂鍛ㄧ敤鍙嶅皠淇敼PackageManager鐨勫畨瑁呴€昏緫锛岀粨鏋滃湪灏忕背鎵嬫満涓婄洿鎺ヨЕ鍙戝畨鍏ㄦ満鍒讹紝搴旂敤琚己琛岀粓姝紒

馃洜 瀹炴垬锛氱粰绯荤粺绫诲仛"鏁村鎵嬫湳"

绐佺劧鎯冲埌涓湡瀹炴渚嬶細鏈変釜閲戣瀺APP闇€瑕佷慨鏀圭郴缁熼敭鐩樼殑纭鎸夐挳鏍峰紡銆傛甯稿紑鍙戞祦绋嬮渶瑕佽嚜瀹氫箟閿洏锛屼絾鐢ㄥ弽灏勫彲浠ヨ繖涔堟悶锛?/p> 

java澶嶅埗
// 1. 鎵惧埌InputMethodService绫?/span>
Class<?> imeClass = Class.forName("android.inputmethodservice.InputMethodService");

// 2. 鑾峰彇杈撳叆娉曠獥鍙ｇ殑绉佹湁鍙橀噺
Field mWindow = imeClass.getDeclaredField("mWindow");
mWindow.setAccessible(true);

// 3. 淇敼绐楀彛鑳屾櫙
View windowView = (View) mWindow.get(inputMethodService);
windowView.setBackgroundColor(Color.parseColor("#FF6B6B"));

鈿狅笍娉ㄦ剰锛氳繖绉嶆搷浣滃繀椤绘斁鍦╰ry-catch閲岋紝涓嶅悓鍘傚晢鐨凴OM鍙兘绉婚櫎鎴栨贩娣嗚繖浜涘瓧娈点€傝寰楀姞鐗堟湰鍒ゆ柇锛?/p> 

java澶嶅埗
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.Q) {
    // 澶勭悊鏃х増鏈€昏緫
} else {
    // 鏂扮増鏈鐢ㄦ柟妗?/span>
}

馃搳 鏂规硶璋冪敤鐨?闃插潙鎸囧崡"

閬囧埌杩囪繖绉嶆儏鍐垫病锛熻皟鐢ㄧ殑鏂规硶鏄庢槑瀛樺湪锛屼絾杩愯鏃舵姤NoSuchMethodException銆傚鍗婃槸鍙傛暟绫诲瀷娌″尮閰嶏紒鏉ョ湅涓姣旓細

姝ｇ‘濮垮娍 鉁?/th>閿欒濮垮娍 鉂?/th>
getMethod("setText", CharSequence.class)getMethod("setText", String.class)
getMethod("addView", View.class, ViewGroup.LayoutParams.class)getMethod("addView", View.class)

鐗瑰埆鏄疉ndroid鐨勯噸杞芥柟娉曪紝鍙傛暟绫诲瀷蹇呴』绮剧‘鍒板瓧鑺傜爜绾у埆銆傛湁娆¤皟View鐨剆etPadding鏂规硶锛屼紶浜嗗洓涓狪nteger鍙傛暟锛岀粨鏋滄柟娉曠鍚嶈int绫诲瀷锛岀洿鎺ョ炕杞︼紒

鐙鏁版嵁锛氬弽灏勬€ц兘鐪熺浉

娴嬭繃1000娆″弽灏勮皟鐢ㄨ€楁椂锛堢孩绫砃ote 11 Pro锛夛細

鎿嶄綔骞冲潎鑰楁椂(ms)
鐩存帴璋冪敤鏂规硶0.03
鍙嶅皠璋冪敤public鏂规硶2.7
鍙嶅皠璋冪敤private鏂规硶3.1
鍙嶅皠+缂撳瓨Method瀵硅薄1.2

鐪嬪嚭鏉ユ病锛熺紦瀛楳ethod瀵硅薄鑳界渷涓€鍗婃椂闂达紒鎵€浠ュ崈涓囧埆鍦ㄥ惊鐜噷鐜版壘Method锛屾彁鍓嶇紦瀛樿捣鏉ユ墠鏄帇閬撱€備箣鍓嶆湁涓垪琛ㄦ粴鍔ㄦ椂瀹炴椂淇敼View灞炴€э紝娌＄紦瀛楳ethod瀵艰嚧鐣岄潰鍗℃垚PPT锛岃娉暀璁晩锛?/p>

灏忕紪绉佹埧璇?/h3>

骞蹭簡杩欎箞澶氬勾Android寮€鍙戯紝鍙嶅皠鐢ㄥ緱鏈€楠氱殑涓€娆℃槸浠€涔堬紵鏄敤鍙嶅皠淇敼WebView鐨凷SL璇佷功鏍￠獙锛屽湪娴嬭瘯鐜缁曡繃HTTPS鏍￠獙銆備笉杩囧崈涓囧埆鍦ㄧ敓浜х幆澧冭繖涔堢帺锛佺幇鍦ㄥ悇瀹跺巶鍟嗗闈炲叕寮€API鐨勯檺鍒惰秺鏉ヨ秺涓ワ紝鍍廇ndroid 13涔嬪悗锛岄潪SDK鎺ュ彛璋冪敤浼氱洿鎺ュ脊绐楄鍛娿€?/p>

绐佺劧鎯冲埌涓喎鐭ヨ瘑锛氬井淇＄殑鎻掍欢鍖栨鏋禩inker锛屽簳灞傚氨鏄潬鍙嶅皠瀹炵幇鐑慨澶嶃€備笉杩囦汉瀹剁敤浜嗗ぇ閲忕紦瀛樺拰寮傚父澶勭悊锛屼笉鏄挶浠繖绉嶇畝鍗曠矖鏆寸殑鐜╂硶銆傛墍浠ヨ鍙嶅皠涓嶆槸涓嶈兘鐢紝鍏抽敭寰楃敤寰楄仾鏄庯紒

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