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Java android,如何在活动之间传递值。主菜单、选项菜单

android-menu android-activity android-intent

lockgar · 技术社区 · 10 年前

尝试为android制作一个简单的游戏应用程序,设置选项时遇到问题。

现在就做一个基本的设置。

创建了一个全局类,因为只有在选项菜单中才能真正更改,只有在游戏开始时才能读取。

播放器.java

package com.example.gametest;

import android.app.Activity;

public class player extends Activity
{
    int pID;
    String PlayerName;

    public player()
    {

    }

    public void setpID( int ID){pID = ID;}
    public int getpID (int ID){return pID;}
    public void setPlayerName(String Name){PlayerName = Name;}
    public String getPlayerName (int ID){return PlayerName;}
}

主要活动.java

public class MainActivity extends Activity {
player player1 = new player();
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    player1.pID = 1;
    player1.PlayerName = "NoName";
    setContentView(R.layout.activity_main);
    TextView textbox1 = (TextView) findViewById(R.id.textView1);
    textbox1.setText("Hello " + player1.PlayerName);
}
    public void optionsGame(View view) throws FileNotFoundException 
{
    // Do something in response to button
    Intent intent = new Intent(this, options.class);
    //EditText editText = (EditText) findViewById(R.id.editText1);
    //String message = editText.getText().toString();
    //intent.putExtra(EXTRA_MESSAGE, message);
    startActivity(intent);  
}
}

选项.java

import java.io.FileNotFoundException;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class options extends Activity{
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.optionpage);
        //Intent intent = getIntent();
    }

    public void backMain(View view) throws FileNotFoundException
    {
        super.onBackPressed();
    }

    public void saveOptions(View view) throws FileNotFoundException
    {
        TextView editText1 = (TextView) findViewById(R.id.editText1);
        Intent ActivityTwo = new Intent();

        Bundle bundle = new Bundle();

        bundle.putString("Player_Name", editText1.getText().toString());
        ActivityTwo.putExtras(bundle);
        setResult(RESULT_OK, ActivityTwo);
        finish();
    }
}

基本上,现在我只想拥有它,以便在options活动中,可以在那里设置名称。从我读到的内容来看,应该很简单,但无法理解。

我知道为什么这是错误的,没有任何东西被真正设置为可以在Activity实例之间传递的值,但我不知道如何设置这样的值。

此外,如果你正在玩,在我的xmls中,我使用android:onClick=“optionsGame”和android:on Click=“saveOptions”。

所以我看了这些,但仍然找不到一个简单的方法。

Sending data back to the Main Activity in android

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1 回复 | 直到 7 年前

lockgar 10 年前

我想通了。主要活动.java

    public void optionsGame(View view) throws FileNotFoundException 
{
    // Do something in response to button
    Intent intent = new Intent(this, options.class);
    Intent i = new Intent(this, options.class);
    startActivityForResult(i, 1);
    String message = player1.PlayerName;
    intent.putExtra(EXTRA_MESSAGE, message);  
}

和选项.java

    public void saveOptions(View view) throws FileNotFoundException
{
    TextView editText1 = (TextView) findViewById(R.id.editText1);
    Intent returnIntent = new Intent();
     returnIntent.putExtra("result" , editText1.getText().toString());
     setResult(RESULT_OK,returnIntent);     
     finish();
}

然后返回,创建一个新函数。主要活动.java

    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{

      if (requestCode == 1) 
      {

         if(resultCode == RESULT_OK)
         {      
             String result=data.getStringExtra("result");  
             player1.PlayerName = result;
             TextView textbox1 = (TextView) findViewById(R.id.textView1);
             textbox1.setText("Hello " + player1.PlayerName);
         }
         if (resultCode == RESULT_CANCELED) 
         {    
             //Write your code if there's no result
         }
      }
    }//onActivityResult