我有一个AppCompatPreferenceActivity.java.但这显示了一个错误

公共类SettingsActivity扩展了AppCompatPreferenceActivity
它说它无法解析’AppCompatPreferenceActivity’.

看来我是唯一遇到此问题的人.任何想法？

错误：(21、39)错误：找不到符号类AppCompatPreferenceActivity

解决方法:

Google支持库中不存在AppCompatPreferenceActivity,

您应该使用相同的名称创建一个类并使用此源：

public abstract class AppCompatPreferenceActivity extends PreferenceActivity {

private AppCompatDelegate mDelegate;

@Override
protected void onCreate(Bundle savedInstanceState) {
    getDelegate().installViewFactory();
    getDelegate().onCreate(savedInstanceState);
    super.onCreate(savedInstanceState);
}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    getDelegate().onPostCreate(savedInstanceState);
}

public ActionBar getSupportActionBar() {
    return getDelegate().getSupportActionBar();
}

public void setSupportActionBar(@Nullable Toolbar toolbar) {
    getDelegate().setSupportActionBar(toolbar);
}

@Override
public MenuInflater getMenuInflater() {
    return getDelegate().getMenuInflater();
}

@Override
public void setContentView(@LayoutRes int layoutResID) {
    getDelegate().setContentView(layoutResID);
}

@Override
public void setContentView(View view) {
    getDelegate().setContentView(view);
}

@Override
public void setContentView(View view, ViewGroup.LayoutParams params) {
    getDelegate().setContentView(view, params);
}

@Override
public void addContentView(View view, ViewGroup.LayoutParams params) {
    getDelegate().addContentView(view, params);
}

@Override
protected void onPostResume() {
    super.onPostResume();
    getDelegate().onPostResume();
}

@Override
protected void onTitleChanged(CharSequence title, int color) {
    super.onTitleChanged(title, color);
    getDelegate().setTitle(title);
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    getDelegate().onConfigurationChanged(newConfig);
}

@Override
protected void onStop() {
    super.onStop();
    getDelegate().onStop();
}

@Override
protected void onDestroy() {
    super.onDestroy();
    getDelegate().onDestroy();
}

public void invalidateOptionsMenu() {
    getDelegate().invalidateOptionsMenu();
}

private AppCompatDelegate getDelegate() {
    if (mDelegate == null) {
        mDelegate = AppCompatDelegate.create(this, null);
    }
    return mDelegate;
}

}