操作栏后退按钮在webview中不起作用

Question

在我的android webView中，android操作栏中的后退按钮不起作用，而硬件按钮工作正常，我甚至在操作栏中也有一个菜单按钮。

Java文件

@Bean
    public MappingJackson2HttpMessageConverter customJackson2HttpMessageConverter() {
       MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
       ObjectMapper objectMapper = new ObjectMapper();
          objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
          objectMapper.configure(SerializationFeature.WRITE_DATE_KEYS_AS_TIMESTAMPS, true);
          objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
          objectMapper.setDateFormat(new SimpleDateFormat("dd MMM yyyy hh:mm:ss a"));
      jsonConverter.setObjectMapper(objectMapper);

      return jsonConverter;
     }

Answer 1

尝试使用 android.R.id.home

@Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        if (id == android.R.id.home) {
            Toast.makeText(this, "Back Button clicked", Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(this, MainActivity.class);
            startActivity(intent);
            this.finish();
        }
        return super.onOptionsItemSelected(item);
    }

Answer 2

使用以下代码。

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();

    if(id == R.id.btn_home)
    {
       onBackPressed();
    }
    return true;
}