Android Activity onBackPressed废弃替代方案

zhaohw_lenovo2024-09-02 21:53

java 复制代码

@Override
@MainThread
@CallSuper
@Deprecated
public void onBackPressed() {
    getOnBackPressedDispatcher().onBackPressed();
}

Activity中的onBackPressed方法在覆盖时，会提示已经废弃，下面是用新的方案替代

1、在manifest.xml中，设置enableOnBackInvokedCallback为true

XML 复制代码

<application
        android:enableOnBackInvokedCallback="true">

2、在Activity的onCreate方法添加以下代码，在handleOnBackPressed中实现对back的控制

java 复制代码

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getOnBackPressedDispatcher().addCallback(this, new androidx.activity.OnBackPressedCallback(true) {
        @Override
        public void handleOnBackPressed() {
            finish();
        }
    });
}

3、在DialogFragment中，针对android 13及以上需要特殊设置OnBackInvokedDispatcher

java 复制代码

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        Dialog dialog = super.onCreateDialog(savedInstanceState);
        Window window = dialog.getWindow();
        if (window != null && android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.TIRAMISU) {
            // Get the dispatcher
            OnBackInvokedDispatcher dispatcher = window.getOnBackInvokedDispatcher();
            // Add a callback
            dispatcher.registerOnBackInvokedCallback(
                    OnBackInvokedDispatcher.PRIORITY_DEFAULT,
                    new OnBackInvokedCallback() {
                        @Override
                        public void onBackInvoked() {
                            // Handle the back button press here
                            // You can dismiss the dialog or do other things
                            backPressed();
                        }
                    }
            );
        }
        dialog.setOnKeyListener((dialog1, keyCode, event) -> event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK && backPressed());
        return dialog;
    }