android - 我可以强制 Android 后退按钮在 Activity 堆栈中后退两步吗？

Question

我知道我可以重写 onKeyDown 方法，但我希望 Back 执行此操作，只需两次!

Answer 1

FirstActivity

Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
startActivity(intent);

第二个 Activity

int REQUEST_CODE = 123
Intent intent = new Intent(SecondActivity.this, ThirdActivity.class);
startActivityForResult(intent, REQUEST_CODE);

(为了使这个教学法有更多代码用于下面的这个 Activity )

第三 Activity

@Override
public void onBackPressed() {
    // Semi ugly way of supporting that back button takes us back two activites instead of the usual one.
    setResultOkSoSecondActivityWontBeShown();
    finish();   
}

private void setResultOkSoSecondActivityWontBeShown() {
    Intent intent = new Intent();
    if (getParent() == null) {
    setResult(Activity.RESULT_OK, intent);
    } else {
        getParent().setResult(Activity.RESULT_OK, intent);
    }
}

SecondActivity(再次)

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == 123) {
        if (resultCode == RESULT_OK) {
            finish();
        }
    }
}