从Activity跳转到其他包内的Activity

Intent intent = new Intent(Intent.ACTION_MAIN); 
intent.setComponent(new ComponentName("包名", "activity全路径"));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
getApplicationContext().startActivity(intent);

比如：

 ComponentName comp = new ComponentName("com.anqiansong.customview","com.anqiansong.customview.MainActivity");
                    Intent intent=new Intent();
                    intent.setComponent(comp);
                    intent.setAction("android.intent.action.VIEW");
                    startActivity(intent);