Android Studio bug總結

1.Error:Could not read cache value from 'C:\Users\xxxxx\.gradle\daemon\4.4\registry.bin'.
解決方法:開啟C盤當前使用者資料夾->.gradle->daemon->選擇報錯得gradle版本的資料夾->選中資料夾中所有檔案並刪除->重啟studio
參考連結:https://stackoverflow.com/questions/36664143/could-not-read-cache-value-from-registry-bin-android-studio

開發中bug總結

java.lang.IllegalStateException
Fragment XXXFragment not attached to a context.
字面意思理解，fragment無法和上下文關聯。其實就是fragment還沒有新增到activity中，我在程式碼中使用了getResources(),由於一些原因fragment還沒有新增到activity時就呼叫了該方法，導致報錯，看原始碼：

 /**
     * Return <code>requireActivity().getResources()</code>.
     */
 

    @NonNull
    final public Resources getResources() {
        return requireContext().getResources();
    }

/**
     * Return the {@link Context} this fragment is currently associated with.
     *
     * @throws IllegalStateException if not currently associated with a context.
     * @see #getContext()
     */
 

    @NonNull
    public final Context requireContext() {
        Context context = getContext();
        if (context == null) {
            throw new IllegalStateException("Fragment " + this + " not attached to a context.");
        }
        return context;
    }

在context為空時會爆出該異常
解決辦法：使用fragment自帶方法isAdd()，新增判斷即可

 /**
     * Return true if the fragment is currently added to its activity.
     */
    final public boolean isAdded() {
        return mHost != null && mAdded;
    }