Android InputMethodManager泄漏Activity

通过Android Profile+MAT定位到InputMethodManager泄漏Activity。

• 解决方案

import android.content.Context;
import android.view.View;
import android.view.inputmethod.InputMethodManager;

import java.lang.reflect.Field;

/**
 * 内存泄漏工具类
 * 作者： FebMaple on 26/12/2018.
 * 版权： FebMaple
 * ====================================================
 */
public class MemoryLeakUtil {

    /**
     * fix InputMethodManager leak memory
     *
     * @param context
     */
    public static void fixInputMethodMemoryLeak(Context context) {
        if (context == null)
            return;
        InputMethodManager inputMethodManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
        if (inputMethodManager == null)
            return;

        String[] viewArr = new String[]{"mCurRootView", "mServedView", "mNextServedView", "mLastSrvView"};
        Field field;
        Object fieldObj;
        for (String view : viewArr) {
            try {
                field = inputMethodManager.getClass().getDeclaredField(view);
                if (!field.isAccessible()) {
                    field.setAccessible(true);
                }
                fieldObj = field.get(inputMethodManager);
                if (fieldObj != null && fieldObj instanceof View) {
                    View fieldView = (View) fieldObj;
                    if (fieldView.getContext() == context) {// 被InputMethodManager持有引用的context是想要目标销毁的
                        field.set(inputMethodManager, null);
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}

在泄漏的activity ondestroy内添加

  @Override
    protected void onDestroy() {
        MemoryLeakUtil.fixInputMethodMemoryLeak(this);
        super.onDestroy();
    }