• 通過(guò)Intent意圖傳值
  方式一：
  頁(yè)面A：Intent intent = new Intent（A.this,B.class）；
  intent.putExtra(kay,value);
  startActivity(intent);

           頁(yè)面B：Intent intent = getIntent();
           intent.getStringExtra(kay);
  

方式二：
頁(yè)面A：Intent intent = new Intent(A.this,B.class);
Bundle bundle = new Bundle();
bundle.putString(key,value);
input.putExtras(bundle);
startActivity(intent);

           頁(yè)面 B：Intent intent = getIntent();
           Bundle bundle = intent.getExtras();
            bundle.getString(key); 

• 靜態(tài)成員變量傳值（不建議使用）
  方式：1.在頁(yè)面A中聲明一個(gè)公共的靜態(tài)成員變量，在合適的位置存入數(shù)據(jù)
  2.直接訪問(wèn)頁(yè)面A中的靜態(tài)成員變量，讀取相應(yīng)的內(nèi)容

• 全局變量傳值（Application）
  方式：1.創(chuàng)建Application的子類，并且在類中聲明全局變量
  public class MyApplication extends Application {

           //應(yīng)用的全局變量
          public Map<String,Object> data = new HashMap<String, Object>();
  
      }
  

2.在清單文件<Application />中通過(guò)android：name="包名.類名"引入
3.在頁(yè)面A合適位置存入數(shù)據(jù)
MyApplication application = (MyApplication) getApplication();//不能new MyApplication要用getApplication得到Application對(duì)象，向下轉(zhuǎn)型得到MyApplication
application.data.put("name", "小翠");
application.data.put("age", 21);
4.在頁(yè)面B中取數(shù)據(jù)
MyApplication application = (MyApplication) getApplication();
String name = application.data.get("name").toString();
int age =Integer.parseInt(application.data.get("age").toString());

• 回傳數(shù)據(jù)

以選取用戶頭像為例：
頁(yè)面A：startActivityForResult（intent，requestCode）；
頁(yè)面B：setResult（resultCode，Intent data）；
頁(yè)面A：重寫(xiě)onActivityResult（requestCode，resultCode）；

頁(yè)面A代碼：

     public class MainActivity extends Activity {
                private ImageView iv;   
       @Override
     protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main)；
    iv = (ImageView) findViewById(R.id.iv);
  }  
  public void show(View v)
   {
    Intent intent = new Intent(MainActivity.this, InfoActivity.class);
    
    //帶返回?cái)?shù)據(jù)啟動(dòng)Activity
    startActivityForResult(intent, 110);
   }
   /**
  * 獲取回傳的數(shù)據(jù)
  * 
  * int requestCode  請(qǐng)求碼
  * int resultCode   結(jié)果碼
  * Intent data     意圖(帶著返回參數(shù))
  */
  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode==110 && resultCode == RESULT_OK)
    {
        //為圖片控件設(shè)置內(nèi)容
        
        int imageId = data.getIntExtra("imageId", R.drawable.ic_launcher);
        
        iv.setImageResource(imageId);
    }
  }    
  }

頁(yè)面B：

public class InfoActivity extends Activity {

private RadioGroup rg;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_info);
    
    rg = (RadioGroup) findViewById(R.id.rg);
}

//點(diǎn)擊按鈕后,將圖片的ID 回傳給MainActivity頁(yè)面
public void submit(View v)
{
    //1, 得到當(dāng)前選中的RadionButton的id
    int checkId = rg.getCheckedRadioButtonId();
    
    //圖片的ID
    int imageId = R.drawable.ic_launcher;
    
    switch (checkId) {
    
    case R.id.rb1:
        
        imageId = R.drawable.img_31;
        
        break;

    case R.id.rb2:
        
        imageId = R.drawable.img_32;
        
        break;
        
    case R.id.rb3:
        
        imageId = R.drawable.img_33;
        
        break;
        
    case R.id.rb4:
        
        imageId = R.drawable.img_42;
        
        break;
        
    case R.id.rb5:
        
        imageId = R.drawable.img_43;
        
        break;
        
    case R.id.rb6:
        
        imageId = R.drawable.img_44;
        
        break;
    }
    
    
    /**
     * 通過(guò)startActivityForResult() 開(kāi)啟的界面, 需要有返回值,
     * 
     * 則必須要通過(guò) setResult() 方法返回?cái)?shù)據(jù)
     * 
     * resultCode  返回碼
     * 
     * data        intent意圖對(duì)象
     */
    Intent data = new Intent();
    data.putExtra("imageId", imageId);
    
    setResult(RESULT_OK, data);
    
    //關(guān)閉當(dāng)前Activity頁(yè)面
    finish();
}   
}