android - 处理菜单项点击事件 - Android

Question

我想创建一个在单击菜单项后启动新 Activity 的 Intent ，但我不确定如何执行此操作。我一直在阅读 android 文档，但我的实现不正确..一些正确方向的指导会有所帮助。我在下面列出了我的代码并注释掉了我的问题区域，我认为我调用了错误的方法。

package com.jbsoft.SimpleFlashlight;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.*;
import android.view.MenuItem.OnMenuItemClickListener;
import android.widget.Button;
import android.widget.Toast;

public class SimpleFlashLightActivity extends Activity {


  Button GreenButton;   // Declare instances of buttons to use later
  Button BlueButton;

  private static final int OK_MENU_ITEM = Menu.FIRST;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    BlueButton = (Button) findViewById(R.id.bluebutton);
    BlueButton.setOnClickListener(new View.OnClickListener() {

      public void onClick(View v) {

        //Display msg when user clicks Blue Button
        showColorChangeMsg();

        // Switch Activities on click
        Intent blueintent = new Intent(SimpleFlashLightActivity.this,
                                       BlueFlashLightActivity.class);
        startActivity(blueintent);

      }
    });
    //Install listener for second button
    GreenButton = (Button) findViewById(R.id.greenbutton);
    GreenButton.setOnClickListener(new View.OnClickListener() {

      public void onClick(View v) {

        // Display msg when user clicks Green Button
        showColorChangeMsg();

        Intent greenintent = new        Intent(SimpleFlashLightActivity.this,
                                               GreenFlashLightActivty.class);
        startActivity(greenintent);

      }
    });

    ;

    /**************************************************************************************/

    // Method Declarations // THIS IS WHERE I'M HAVING A PROBLEM

    MenuItem AddColorButton = (MenuItem)findViewById(R.id.menu_insert);

    boolean onOptionsItemSelected(AddColorButton) {
      Intent intent = new  Intent(SimpleFlashLightActivity.this,
                                  BlueFlashLightActivity.class);
      startActivity(intent);
      return true;
      ;
    };
    /****************************************************************************************/

  }
  private void showColorChangeMsg()
  {
    Toast msgtoast = Toast.makeText(this.getBaseContext(), "SWITCH COLOR!",
                                    Toast.LENGTH_LONG);
    msgtoast.show();
  }
  private void showMsg(String msg) {
    Toast toast = Toast.makeText(this, msg, Toast.LENGTH_LONG);
    toast.show();
  }

  public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);
    MenuInflater mi = getMenuInflater();
    mi.inflate(R.menu.list_menu, menu);
    return true;

  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case OK_MENU_ITEM:
      showMsg("OK");
      break;
    }
    return super.onOptionsItemSelected(item);
  }

}

Answer 1

添加以下代码

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.new_item:
        Intent i = new Intent(this,SecondActivity.class);
            this.startActivity(i);
            return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}