Intent intent = new Intent();
(1)intent.setClass(this,OtherActivity.class);
(2)intent.setClassName(this,"com.xiazdong.OtherActivity");
(3)intent.setClassName("com.xiazdong","com.xiazdong.OtherActivity");//不同应用间
(4)intent.setComponent(new Component(this,OtherActivity.class));
(5)Intent intent = new Intent(this,OtherActivity.class);
startActivity(intent );//启动 startService启动服务
finish();//关闭窗口
选中控件鼠标右键添加到Design,设置关联id后,findviewbyid