// 首先需要?jiǎng)?chuàng)建啟動(dòng)的Activity對(duì)應(yīng)的Intent
Intent intent = new Intent(MainActivity.this, TwoActivity.class);

// 啟動(dòng)Activity
startActivity(Intent intent);
startActivityForResult(Intent intent, int requestCode); // requestCode：請(qǐng)求碼
//startActivityForResult方法以指定的請(qǐng)求碼啟動(dòng)Activity，并通過(guò)重寫onActivityResult方法獲取返回的結(jié)果。

// 關(guān)閉Activity
finish();
finishActivity(int requestCode);
// finishActivity方法結(jié)束以startActivityForResult方法啟動(dòng)的Activity。

public class MainActivity extends Activity {
  Button bn;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    // 獲取界面上的組件
    ...
    // 綁定事件監(jiān)聽(tīng)器
    bn.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View view) {
        Intent intent = new Intent(MainActivity.this, TwoActivity.class);
        startActivityForResult(intent, 0); // 0是請(qǐng)求碼，用于標(biāo)識(shí)該請(qǐng)求
      }
    });
  }
  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    // 處理特定的結(jié)果
    if (requestCode == 0 && resultCode == 0) {
      // 取出Intent里的Extras數(shù)據(jù)
      Bundle data = intent.getExtras();
      // 取出Bundle中的數(shù)據(jù)
      String result = data.getString("test");
      Toast.makeText(getApplicationContext(), result, 0).show();
    }
  }
}

// 獲取啟動(dòng)該Activity之前的Activity對(duì)應(yīng)的Intent
Intent intent = getIntent();
intent.putExtra("test", "test");
// 設(shè)置該SelectActivity的結(jié)果碼，并設(shè)置結(jié)束之后退回的Activity
SelectCityActivity.this.setResult(0, intent);
// 結(jié)束TwoActivity
TwoActivity.this.finish();

intent.putExtras(Bundle data); // 向Intent放入數(shù)據(jù)包
intent.putExtras(String name, Xxx value); // 向Intent中按key-value對(duì)的形式放入數(shù)據(jù)
intent.getExtras(); // 取出Intent中攜帶的數(shù)據(jù)包
intent.getXxxExtras(String name); //從Intent中按key取出指定類型的數(shù)據(jù)

Bundle bundle = new Bundle(); // 首先創(chuàng)建一個(gè)Bundle對(duì)象
bundle.putXxx(String key, Xxx data); // 向Bundle中放入數(shù)據(jù)
bundle.putSerializable(String key, Serializable data); // 向Bundle中放入一個(gè)可序列化的對(duì)象（即實(shí)現(xiàn)了java.io.Serializable接口）
bundle.getXxx(String key); // 從Bundle中取出數(shù)據(jù)
bundle.getSerializable(String key); // 從Bundle中取出一個(gè)可序列化的對(duì)象

// 重寫該方法，該方法返回的View將作為Fragment顯示的組件
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  // 加載/res/layout/目錄下的fragment.xml布局文件
  View view = inflater.inflate(R.layout.fragment, container, false);
  TextView name = (TextView)view.findViewById(R.id.name));
  ...
  return view;
}

public class MyFragment extends Fragment  { 
  @Override 
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    return inflater.inflate(R.layout.fragment_my, container, false); 
  } 
}
public class TwoFragment extends Fragment  { 
  @Override 
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    return inflater.inflate(R.layout.fragment_two, container, false); 
  } 
}

// 設(shè)置默認(rèn)的Fragment
FragmentManager fm = getFragmentManager(); 
FragmentTransaction transaction = fm.beginTransaction(); 
myFragment = new MyFragment(); 
transaction.replace(R.id.fl, myFragment); 
transaction.commit();

@Override 
public void onClick(View v) { 
  FragmentManager fm = getFragmentManager(); 
  // 開(kāi)啟Fragment事務(wù) 
  FragmentTransaction transaction = fm.beginTransaction(); 
  twoFragment = new TwoFragment(); 
  // 使用當(dāng)前Fragment的布局替代fl的控件 
  transaction.replace(R.id.fl, twoFragment); 
  // transaction.addToBackStack(); // 將事物添加到back棧，允許用戶按BACK按鍵返回到替換Fragment之前的狀態(tài)
  // 事務(wù)提交 
  transaction.commit(); 
}