Android:Activity的跳转

               // 实际开发中常用的方法
　　　　　　　　　Intent intent = new Intent();
                intent.setClass(MainActivity.this, LoginActivity.class);
                startActivity(intent);

               //<疯狂Android>中介绍的方法 
　　　　　　　　　ComponentName comp = new ComponentName(MainActivity.this, FullscreenActivity02.class);
                Intent intent = new Intent();
                intent.setComponent(comp);
                startActivity(intent);

 界面间传值:

        // 数据打包
        Bundle bdl = new Bundle();
        bdl.putString("name", "A");
        bdl.putInt("years", 17);
        // 跳界传参
        Intent itt_1 = new Intent(this, A01_Activity.class);
        itt_1.putExtras(bdl);
        
        // 起跳
        startActivity(itt_1);
//-----------------------------------------------------------------
        // Intent->Bundle->取值
        Intent itt_2 = getIntent();
        Bundle dbl = itt_2.getExtras();
        String str = dbl.getString("name");
        int n = dbl.getInt("years");
        
        System.out.println(str + "●<--------------------->●" + n);

或者不直接使用Bundle传参

        // 跳界传参
        Intent itt_1 = new Intent(this, A01_Activity.class);
        itt_1.putExtra("name", "A");
        itt_1.putExtra("years", 18);
        
        // 起跳
        startActivity(itt_1);
//-------取值的地方是一样的-------------------------------------------------------------------
        // Intent->Bundle->取值
        Intent itt_2 = getIntent();
        Bundle dbl = itt_2.getExtras();
        String str = dbl.getString("name");
        int n = dbl.getInt("years");