文章目錄

• 一、報錯信息
• 二、解決方案

一、報錯信息

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在執行反射方法時 , 反射方法后 , 直接調用該方法 ;

// 獲取 View 的 getListenerInfo 方法 Method getListenerInfo = null; try {getListenerInfo = View.class.getDeclaredMethod("getListenerInfo"); } catch (NoSuchMethodException e) {e.printStackTrace(); }// 執行 View view 對象的 getListenerInfo 方法 Object mListenerInfo = null; try {mListenerInfo = getListenerInfo.invoke(view); } catch (IllegalAccessException e) {e.printStackTrace(); } catch (InvocationTargetException e) {e.printStackTrace(); }

出現如下報錯信息 :

2021-06-17 10:39:08.146 3297-3297/com.example.plugin_hook W/System.err: java.lang.IllegalAccessException: Class java.lang.Class<com.example.plugin_hook.MainActivity> cannot access method android.view.View$ListenerInfo android.view.View.getListenerInfo() of class java.lang.Class<android.view.View> 2021-06-17 10:39:08.146 3297-3297/com.example.plugin_hook W/System.err: at java.lang.reflect.Method.invoke(Native Method) 2021-06-17 10:39:08.146 3297-3297/com.example.plugin_hook W/System.err: at com.example.plugin_hook.MainActivity.hook(MainActivity.java:56) 2021-06-17 10:39:08.146 3297-3297/com.example.plugin_hook W/System.err: at com.example.plugin_hook.MainActivity.onCreate(MainActivity.java:32) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.Activity.performCreate(Activity.java:7144) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.Activity.performCreate(Activity.java:7135) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2931) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.os.Handler.dispatchMessage(Handler.java:106) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.os.Looper.loop(Looper.java:193) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6718) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at java.lang.reflect.Method.invoke(Native Method) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 2021-06-17 10:39:08.147 3297-3297/com.example.plugin_hook W/ple.plugin_hoo: Accessing hidden field Landroid/view/View$ListenerInfo;->mOnClickListener:Landroid/view/View$OnClickListener; (light greylist, reflection) 2021-06-17 10:39:08.149 3297-3297/com.example.plugin_hook E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.example.plugin_hook, PID: 3297java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.plugin_hook/com.example.plugin_hook.MainActivity}: java.lang.NullPointerException: null receiverat android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2951)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086)at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)at android.os.Handler.dispatchMessage(Handler.java:106)at android.os.Looper.loop(Looper.java:193)at android.app.ActivityThread.main(ActivityThread.java:6718)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)Caused by: java.lang.NullPointerException: null receiverat java.lang.reflect.Field.get(Native Method)at com.example.plugin_hook.MainActivity.hook(MainActivity.java:86)at com.example.plugin_hook.MainActivity.onCreate(MainActivity.java:32)at android.app.Activity.performCreate(Activity.java:7144)at android.app.Activity.performCreate(Activity.java:7135)at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2931)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6718) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

二、解決方案

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執行所有的反射方法 , 設置成員變量 之前 , 都要設置可見性 ;

// 執行所有的反射方法 , 設置成員變量 之前 , 都要設置可見性getListenerInfo.setAccessible(true);

只要使用了反射 , 說明通過正常途徑是無法運行的 , 因此凡是涉及到 反射方法執行 , 反射成員訪問 , 一律設置可見性 ;

修改后代碼 :

// 獲取 View 的 getListenerInfo 方法Method getListenerInfo = null;try {getListenerInfo = View.class.getDeclaredMethod("getListenerInfo");} catch (NoSuchMethodException e) {e.printStackTrace();}// 執行所有的反射方法 , 設置成員變量 之前 , 都要設置可見性getListenerInfo.setAccessible(true);// 執行 View view 對象的 getListenerInfo 方法Object mListenerInfo = null;try {mListenerInfo = getListenerInfo.invoke(view);} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}

總結

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