切换活动/活动之间传递数据 [英] Switching activities/passing data between activities

问题描述

因此​​，使用从最后一个问题，我问意见，我想通了，如何调用酒吧codeScanner，值返回到域中。所以现在，我有一个敬酒，说：成功的扫描，然后我要的结果传递给新的活动。当我注释掉我的意图，一切正常（减去数据/屏幕切换的传球，很明显），但是当我跑我的项目是，它FC的......没有错误在code或XML蚀的报道。任何见解？

 包com.mhe.test.scan;进口android.app.Activity;
进口android.content.Context;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.View;
进口android.widget.Button;
进口android.widget.EditText;
进口android.widget.Toast;
公共类主要活动扩展{
 / **当第一次创建活动调用。 * /
 @覆盖
 公共无效的onCreate（捆绑savedInstanceState）{
 super.onCreate（savedInstanceState）;
 的setContentView（R.layout.main）;
   按钮myScanButton =（按钮）findViewById（R.id.myScanButton）;
   totalbox =（EditText上）findViewById（R.id.tBox）;     myScanButton.setOnClickListener（新Button.OnClickListener（）{
       公共无效的onClick（视图v）{
         意向意图=新意图（com.google.zxing.client.android.SCAN）;
         intent.putExtra（SCAN_MODE，PRODUCT_MODE）;
         startActivityForResult（意向，0）;
      }
   }）;
  }
  私人的EditText totalbox;
  公共无效的onActivityResult（INT申请code，INT结果code，意图意图）{
    如果（要求code == 0）{
      如果（结果code == RESULT_OK）{
      最终字符串内容= intent.getStringExtra（SCAN_RESULT）;        如果（totalbox！= NULL）
         totalbox.setText（内容）;
        上下文的背景下= getApplicationContext（）;
        CharSequence的文字=成功扫描;
        INT持续时间= Toast.LENGTH_SHORT;
        吐司面包= Toast.makeText（背景，文本，持续时间）;
        toast.show（）;
    意图I =新意图（main.this，Result.class）;
        i.putExtra（SNARP，SCAN_RESULT）;
        startActivityForResult（I，0）;      }否则如果（结果code == RESULT_CANCELED）{        如果（totalbox！= NULL）
          totalbox.setText（无赖）;
      }
    }
  }}
 

和再处理所传递的数据，在新的活动：

 包com.mhe.test.scan;进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.View;
进口android.widget.Button;
进口android.widget.EditText;公共类结果延伸活动{
  / **当第一次创建活动调用。 * /
  @覆盖
  公共无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.result）;    意向I = getIntent（）;
    束B = i.getExtras（）;
    串foosh = b.getString（SNARP）;    的EditText BOX1 =（EditText上）findViewById（R.id.tBox1）;
       box1.setText（foosh）;
 

解决方案

尝试调用新的意图时，发送捆绑对象。

 意向书I =新意图（main.this，Result.class）;
束B =新包（）;
b.putString（SNARP，SCAN_RESULT）
i.putExtras（二）;
 

So using suggestions from the last question I asked, I figured out how to call BarCodeScanner, and return the value to a field. so now, I have a toast that says "successful scan" and then I want to pass the result to a new activity. when I comment out my intent, everything works (minus the passing of data/switching of screen, obviously) but when I run my project as is, it FC's... no errors reported by eclipse in code or XML. Any insights?

package com.mhe.test.scan;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class main extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
   Button myScanButton = (Button) findViewById(R.id.myScanButton); 
   totalbox = (EditText) findViewById(R.id.tBox);        

     myScanButton.setOnClickListener(new Button.OnClickListener() {
       public void onClick(View v) {
         Intent intent = new Intent("com.google.zxing.client.android.SCAN");
         intent.putExtra("SCAN_MODE", "PRODUCT_MODE");
         startActivityForResult(intent, 0);
      }
   });
  }
  private EditText totalbox;
  public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 0) {
      if (resultCode == RESULT_OK) {
      final String contents = intent.getStringExtra("SCAN_RESULT");

        if ( totalbox != null )
         totalbox.setText(contents);


        Context context = getApplicationContext();
        CharSequence text = "Successful Scan";
        int duration = Toast.LENGTH_SHORT;
        Toast toast = Toast.makeText(context, text, duration);
        toast.show();


    Intent i = new Intent(main.this, Result.class);
        i.putExtra("SNARP", "SCAN_RESULT");
        startActivityForResult(i, 0);

      } else if (resultCode == RESULT_CANCELED) {

        if ( totalbox != null )
          totalbox.setText("bummer");
      }
    }      
  }

}

And then to handle the data being passed, in the new activity:

package com.mhe.test.scan;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

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

    Intent i = getIntent();
    Bundle b = i.getExtras();
    String foosh = b.getString("SNARP");

    EditText box1 = (EditText) findViewById(R.id.tBox1);     
       box1.setText(foosh); 

解决方案

Try sending a Bundle object when calling the new intent.

Intent i = new Intent(main.this, Result.class);
Bundle b = new Bundle();
b.putString("SNARP", "SCAN_RESULT")
i.putExtras(b);

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