我正在尝试在Scala中实现JSON-RPC服务器，并希望使用注释标记我的远程方法。如果方法本身不应该担心输入参数验证也会很好，所以我想把这个验证放在注释中。我最终得到了这个：
MainActivity.class远程方法注释如下：
package com.example.TodoList;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.location.LocationManager;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import com.example.TodoList.db.TaskContract;
import com.example.TodoList.db.TaskDBHelper;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ListAdapter listAdapter;
private TaskDBHelper helper;
private Toolbar toolbar;
private Button btnIconTextTabs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
updateUI();
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
btnIconTextTabs = (Button) findViewById(R.id.btnIconTextTabs);
btnIconTextTabs.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
final EditText inputField = new EditText(this);
builder.setNegativeButton("Cancel", null);
switch (item.getItemId()) {
case R.id.action_add_task:
builder.setTitle("Add an article to your shopping list");
builder.setMessage("What would you like to add?");
builder.setView(inputField);
builder.setPositiveButton("Add", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
String task = inputField.getText().toString();
helper = new TaskDBHelper(MainActivity.this);
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues values = new ContentValues();
values.clear();
values.put(TaskContract.Columns.TASK, task);
db.insertWithOnConflict(TaskContract.TABLE, null, values, SQLiteDatabase.CONFLICT_IGNORE);
updateUI();
}
});
builder.create().show();
return true;
case R.id.action_remove_task:
builder.setTitle("Remove an article from the shopping list");
builder.setMessage("Did you found this article?");
builder.setNegativeButton("Remove", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
String task = inputField.getText().toString();
helper = new TaskDBHelper(MainActivity.this);
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues values = new ContentValues();
values.clear();
updateUI();
}
});
case R.id.action_show_mylocation:
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Log.d("MyTagGoesHere", "This is my log message at the debug level here");
//Intent intent=new Intent(this,LbsGeocodingActivity.class);
//startActivity(intent);
Intent GeoLocationIntent = new Intent(MainActivity.this, GeoActivity.class);
//myIntent.putExtra("key", value); //Optional parameters
MainActivity.this.startActivity(GeoLocationIntent);
}
builder.create().show();
return true;
}
private void updateUI() {
helper = new TaskDBHelper(MainActivity.this);
SQLiteDatabase sqlDB = helper.getReadableDatabase();
Cursor cursor = sqlDB.query(TaskContract.TABLE,
new String[]{TaskContract.Columns._ID, TaskContract.Columns.TASK},
null, null, null, null, null);
listAdapter = new SimpleCursorAdapter(
this,
R.layout.task_view,
cursor,
new String[]{TaskContract.Columns.TASK},
new int[]{R.id.taskTextView},
0
);
this.setListAdapter(listAdapter);
}
public void onDoneButtonClick(View view) {
View v = (View) view.getParent();
TextView taskTextView = (TextView) v.findViewById(R.id.taskTextView);
String task = taskTextView.getText().toString();
String sql = String.format("DELETE FROM %s WHERE %s = '%s'",
TaskContract.TABLE,
TaskContract.Columns.TASK,
task);
helper = new TaskDBHelper(MainActivity.this);
SQLiteDatabase sqlDB = helper.getWritableDatabase();
sqlDB.execSQL(sql);
updateUI();
}
public void onSubmitPriceClick(View view) {
Intent SubmitPriceIntent = new Intent(MainActivity.this, SubmitPriceActivity.class);
MainActivity.this.startActivity(SubmitPriceIntent);
}
public void onScrollViewButtonClick(View view) {
Intent SubmitPriceIntent = new Intent(MainActivity.this, IconTextTabsActivity.class);
MainActivity.this.startActivity(SubmitPriceIntent);
}
public void onWebViewButtonClick(View view) {
Intent intent = new
Intent(Intent.ACTION_VIEW,
Uri.parse("http://www.batprice.com:1337"));
startActivity(intent);
finish();
}
public void onGeoLocationButtonClick(View view) {
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Log.d("MyTagGoesHere", "This is my log message at the debug level here");
Intent GeoLocationIntent = new Intent(MainActivity.this, GeoActivity.class);
MainActivity.this.startActivity(GeoLocationIntent);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.btnIconTextTabs:
startActivity(new Intent(MainActivity.this, IconTextTabsActivity.class));
break;
}
}
}
现在我正在尝试提取{case ...}部分并将其评估为检查入站值的函数。但我能用反射得到的只是一棵树：
class RPCMethod(validators: (String, PartialFunction[Any, Boolean])*) extends StaticAnnotation
那么如何从这个树中获取有效的函数对象？