类型的非法开始，预期 <identifier>，';'预期错误

Question

我的代码： https://github.com/LightningFastRom/android_frameworks_base/blob/next-20200913/packages/SystemUI/src/com/android/systemui/qs/QSFooterImpl.java

我试图设置只有当构建类型是 eng 时它才会显示构建号。但是编译的时候出现了很多错误：

error: /home/android/lineage-17.1/frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSFooterImpl.java:106: error: illegal start of type
        if (android.os.Build.TYPE.equals("eng")) {
        ^
error: /home/android/lineage-17.1/frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSFooterImpl.java:106: error: <identifier> expected
        if (android.os.Build.TYPE.equals("eng")) {
                                        ^
error: /home/android/lineage-17.1/frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSFooterImpl.java:106: error: illegal start of type
        if (android.os.Build.TYPE.equals("eng")) {
                                         ^
error: /home/android/lineage-17.1/frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSFooterImpl.java:108: error: ';' expected
            public void onChange(boolean selfChange, Uri uri) {
                                ^
error: /home/android/lineage-17.1/frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSFooterImpl.java:108: error: ';' expected
            public void onChange(boolean selfChange, Uri uri) {
                                                        ^
error: /home/android/lineage-17.1/frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSFooterImpl.java:108: error: not a statement
            public void onChange(boolean selfChange, Uri uri) {
                                                         ^
error: /home/android/lineage-17.1/frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSFooterImpl.java:108: error: ';' expected
            public void onChange(boolean selfChange, Uri uri) {
                                                            ^

Answer 1

你的代码有问题，请检查这个函数

private final ContentObserver mDeveloperSettingsObserver = new ContentObserver(
                new Handler(mContext.getMainLooper())) {
        if (android.os.Build.TYPE.equals("eng")) {
            @Override
            public void onChange(boolean selfChange, Uri uri) {
                super.onChange(selfChange, uri);
                setBuildText();
            }
        }
    };

// new Handler(...) { }, is a functional interface and you can only write inside th `onChange` method , curly braces after constructor is class body, you cannot write statements there, so put your checks inside the function. It will compile.

Answer 2

我可以在 L104 到 L113 行看到问题。您正在尝试基于不允许的 if 条件覆盖方法。您需要将条件放在方法定义本身中。

private final ContentObserver mDeveloperSettingsObserver = new ContentObserver(
            new Handler(mContext.getMainLooper())) {
    @Override
    public void onChange(boolean selfChange, Uri uri) {
        super.onChange(selfChange, uri);
        // put if condition here
        if (android.os.Build.TYPE.equals("eng")) {
             setBuildText();
        }
    }
};

Answer 3

其语法错误大括号未正确闭合

试试这个：

    private final ContentObserver mDeveloperSettingsObserver = new ContentObserver(
            new Handler(mContext.getMainLooper()) {
                @Override
                public void onChange(boolean selfChange, Uri uri) {
                    if (android.os.Build.TYPE.equals("eng")) {
                        super.onChange(selfChange, uri);
                        setBuildText();
        
                    }
                }});

类型的非法开始，预期 <identifier>，';'预期错误

illegal start of type, <identifier> expected, ';' expected errors

java

android

frameworks